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BIOLOGY Ecology
www.njctl.org March 2014
Slide 2 / 192 Vocabulary
abiotic Click on each word below to go to the definition. autotroph biodiversity biome bioplastic biosphere biotic carnivore carrying capacity climate climax community commensalism conservation competition consumer decomposer detritivore ecological succession ecology ecosystem evaporation exponential growth community food chain food web greenhouse effect
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SLIDE 2 Vocabulary
habitat Click on each word below to go to the definition. herbivore heterotroph invasive species limiting nutrient logistic growth monoculture mutualism niche nitrogen fixation nonrenewable resource
precipitation pioneer species predation producer renewable resource runoff symbiosis transpiration parasitism
Slide 4 / 192 Table of Contents
· Intro to Ecology · Population Ecology · Community Ecology
Click on the topic to go to that section
· Nutrient Cycles · Conservation Biology
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Intro to Ecology
Return to Table of Contents
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SLIDE 3 Ecology is the study of the interactions between organisms and their environment.
Ecology
This squirrelfish is being cleaned by a cleaner wrasse. Cleaner wrasse are small fish that eat parasites and debris off of larger fish. An ecologist would see this and think: · Does this harm or benefit the squirrelfish? · Does this behavior lead to higher survival for the cleaner wrasse? · Do cleaner wrasse compete for host fish? · How does this behavior affect predation of the cleaner wrasse?
Slide 7 / 192 Ecology
Acacia ants have a unique relationship with the Acacia tree in which they live. Think like an ecologist. What questions do you have about this behavior? Click the picture to watch a video about Acacia ants.
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Cell Tissue Organ Organism
Levels of Biological Organization
So far, you have studied how cells, tissues and organs interact to create an organism. Ecology studies how organisms interact with
- ther organisms and variables in their environments.
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SLIDE 4 Community
Levels of Biological Organization
Ecosystem Population Organism Biosphere Biome
Slide 10 / 192 Population
A population is a group of individuals that live in the same area, can interbreed, and share the same gene pool. Evolution occurs at a population level. Individual
Formation of new species happens as individuals within a population undergo changes in genotype and phenotype.
Slide 11 / 192 Community
A community is composed of all the different populations of species that live in a given area. Organisms within a community interact with each other ways that can be both beneficial and harmful. Competition for resources between members of a community is one factor that shapes evolution by natural selection.
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SLIDE 5 Ecosystem
An ecosystem includes all of the living and nonliving factors that exist in a community.
Slide 13 / 192 Biomes
A biome is a group of ecosystems that have similar climates, animals and plants. There are both terrestrial and marine biomes. Coral reefs exist in both the Atlantic and Pacific Oceans. However, all reefs are found in shallow, nutrient-rich waters and are inhabited by similar
Slide 14 / 192 Terrestrial Biomes
Desert Temperate Forest Rainforest Tundra Temperate Grasslands Savannah Taiga Alpine Chaparral
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SLIDE 6
Marine Biomes
Freshwater Freshwater Wetlands Marine Coral Reefs Estuaries
Slide 16 / 192 Biosphere
The biosphere is the portion of Earth in which all life exists. This includes the land, water, and air.
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a group of organisms that belong to the same species and live in the same area. different populations that live in the same area. all of the organisms that live in a given area and their physical environment. a group of ecosystems that have the same climate and similar communities. the portion of Earth that contains all ecosystems.
Levels of Biological Organization
Community Biome Biosphere Ecosystem Population
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SLIDE 7 1 Which of the following levels of biological
- rganization includes all of the others?
A Community B Ecosystem C Organism D Population
Answer
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1 Which of the following levels of biological
- rganization includes all of the others?
A Community B Ecosystem C Organism D Population
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Answer B
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Population Ecology
· Factors · Habitats & Niches · Population Growth
Click on the topic to go to that section Return to Table of Contents
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SLIDE 8 Population Ecology
Population ecology studies the interactions between a population and its environment. The water-holding frog of Australia burrows into the ground during the dry
- season. It surrounds itself with a water-
tight mucus secretion that acts as a
- cocoon. When it rains, the frog emerges
to lay eggs. The eggs hatch and the tadpoles develop quickly before the puddle disappears. What types of factors affect the water-holding frog?
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Factors
Populations are affected negatively and positively by a variety
- f factors in their environment.
The saguaro cactus are desert plants with adaptations that enable it to live in dry conditions. They have one large taproot that extends into the ground with small, shallow roots that quickly absorb any water that falls. Spines help to channel water, redirect the wind, protect the cactus from animals, and insulate the cactus. Some animals, such as pack rats, eat the cactus. Other animals, such as bats, eat the fruit of the cactus, aiding in pollination and dispersal of seeds. Name one positive factor and one negative factor that affects the saguaro.
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Wind Temperature Soil Nutrients
Factors
· Sunlight · Precipitation · Temperature · Wind · Soil type · Nutrient availability Abiotic factors are physical, nonliving factors that shape an ecosystem.
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SLIDE 9
Factors
· Plants · Animals · Fungi · Bacteria Biotic factors are the living things that make up an ecosystem.
Slide 24 / 192 Factors
Let's revisit the saguaro cactus... The saguaro cactus are desert plants with have adaptations that enable it to live in dry conditions. They have one large taproot that extends into the ground with small, shallow roots that quickly absorb any water that falls. Spines help to channel water, redirect the wind, protect the cactus from animals, and insulate the cactus. Some animals, such as pack rats, eat the cactus. Other animals, such as bats, eat the fruit of the cactus, aiding in pollination and dispersal of seeds. List two abiotic and two biotic factors that affect the saguaro cactus.
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2 All of the following are abiotic factors except: A microorganisms B pH C temperature D nutrients
Answer
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SLIDE 10 2 All of the following are abiotic factors except: A microorganisms B pH C temperature D nutrients
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Answer A
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3 Which of the following levels of biological organization includes both abiotic and biotic factors? A Species B Population C Community D Ecosystem
Answer
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3 Which of the following levels of biological organization includes both abiotic and biotic factors? A Species B Population C Community D Ecosystem
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Answer D
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SLIDE 11 4 Sea turtles undergo temperature-dependent sex
- determination. The prevailing temperature during
embryonic development determines the sex of the turtle. Warm temperatures result in females while cooler temperatures result in males. What type of factor influences the sex of sea turtles? A Biotic B Abiotic
Answer
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4 Sea turtles undergo temperature-dependent sex
- determination. The prevailing temperature during
embryonic development determines the sex of the turtle. Warm temperatures result in females while cooler temperatures result in males. What type of factor influences the sex of sea turtles? A Biotic B Abiotic
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Answer B
Slide 28 (Answer) / 192 Habitat
The term habitat describes the specific area - including biotic and abiotic factors - where an organism lives within an ecosystem. A habitat is like an
within an ecosystem.
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SLIDE 12 Ecological Niches
An organism's niche is a description of the role it plays in its habitat. A niche includes all aspects of where and how an organism lives including: * the type of food it eats * how it obtains food * where it lives in its environment (tree, nest, hive, etc.) * when and how it reproduces
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Komodo Dragon Niche Komodo dragons live in the Indonesian Islands. They hunt and ambush invertebrates, birds and mammals. They lay up to 20 eggs at a time in self-dug holes. The eggs incubate for eight months. Komodo dragons take nine years to mature and can live up to 30 years.
Ecological Niches Slide 31 / 192 Ecological Niches
A population's habitat answers the question "Where do you live?". A population's niche answers the question "How do you make a living?". Click this picture to watch a video about niches in the North African river plains.
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SLIDE 13 Ecological Niches
No two species can occupy the same niche in the same environment at the same time. If this occurs, competition for resources will displace
The figure below shows three different species of warblers that have established different niches in the same tree.
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5 American green tree frogs live in the southeastern United States near bodies of water that have plentiful vegetation. This is the frog's ______. A Habitat B Niche
Answer
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5 American green tree frogs live in the southeastern United States near bodies of water that have plentiful vegetation. This is the frog's ______. A Habitat B Niche
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Answer A
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SLIDE 14 6 Hyenas are carnivorous mammals that live in Africa. They live in clans that are led by females. Hyenas are successful at both hunting and scavenging food. This describes a hyena's ____. A Habitat B Niche
Answer
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6 Hyenas are carnivorous mammals that live in Africa. They live in clans that are led by females. Hyenas are successful at both hunting and scavenging food. This describes a hyena's ____. A Habitat B Niche
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Answer B
Slide 35 (Answer) / 192 Population Growth
Ecologists are interested in how populations change. Population growth is dependent on · the number of births · the number of deaths · the number of individuals who enter or leave the population. Leaving Entering
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SLIDE 15 Depending on the availability of resources, populations can follow two main patterns of growth:
Population Growth
Exponential Growth Logistic Growth
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Exponential Growth
Exponential growth occurs when a population reproduces at a constant rate. Exponential growth occurs: · in the absence of predation/ disease · in the presence of unlimited resources (food, habitat, etc.)
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Bacteria can be grown under optimal conditions (unlimited resources) in a laboratory setting. If a bacterial population reproduces every 20 minutes, it can grow to a population size of 4.27 x 1020 bacteria in one day.
Exponential Growth
Bacteria reproduce by binary fission.
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SLIDE 16 Logistic Growth
Most populations do not have unlimited resources. When a population becomes too large, it exhausts food supply, water supply and shelter and population size stops increasing. As urban development destroys natural habitat, many animal populations become overpopulated. There are not enough resources to support the population.
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Carrying Capacity
Logistic Growth
The population size that can be maintained with a given amount of resources is called the carrying capacity. Populations that are limited in resources experience logistic growth.
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7 A population can grow exponentially under ideal
- conditions. Which of the following would prevent
exponential growth from continuing? A The population is protected from predators. B The population is protected from disease. C The population runs out of food. D Reproduction occurs at a steady rate.
Answer
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SLIDE 17 7 A population can grow exponentially under ideal
- conditions. Which of the following would prevent
exponential growth from continuing? A The population is protected from predators. B The population is protected from disease. C The population runs out of food. D Reproduction occurs at a steady rate.
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Answer C
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8 Exponential growth does not occur for long in nature, and eventually all population growth slows down. A population's maximum size is referred to as its A limiting growth factor. B carrying capacity. C logistic growth. D exponential capacity.
Answer
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8 Exponential growth does not occur for long in nature, and eventually all population growth slows down. A population's maximum size is referred to as its A limiting growth factor. B carrying capacity. C logistic growth. D exponential capacity.
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Answer B
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SLIDE 18 Community Ecology
· Interactions · Energy Flow · Ecological Succession
Click on the topic to go to that section
· Climate
Return to Table of Contents
Slide 44 / 192 Climate
Communities are adapted to the climates of the ecosystems in which they live. Understanding climate and weather is a useful tool when studying communities.
Slide 45 / 192 Weather vs. Climate
Wind Temperature
Weather is the day-to-day condition of the Earth's atmosphere at a particular time and place. Abiotic factors like wind, temperature, and precipitation produce weather.
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SLIDE 19 Climate refers to the average weather conditions in a region over a number of years.
Climate is caused by many factors including latitude, the trapping of heat by the atmosphere, the transport of heat by winds and ocean currents, precipitation, altitude, and land masses. World Climate Zones
Weather vs. Climate Slide 47 / 192 The Greenhouse Effect
The intensity of sunlight has a major effect on temperature, but it is not the only factor that determines temperature on Earth. Atmospheric gases like carbon dioxide, methane, and water vapor trap the heat energy of sunlight inside Earth's atmosphere. You can think of the greenhouse gases like a blanket that surrounds the Earth and traps in heat - the thicker the blanket, the hotter the temperatures.
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Circulation
The uneven heating of the Earth's surface causes wind and ocean currents that transport heat through the biosphere.
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Solar radiation is more direct near the equator and less direct near the poles. This uneven heating results in warm air from the equator rising while cold air near the poles sinks towards the ground. The upward movement of warm air and downward movement of cold air create air currents that transfer heat.
Circulation
Slide 50 / 192 Ocean Currents
Similarly, in the ocean cold water sinks towards the bottom near the poles and rises in warmer regions. Surface water is moved by winds. Ocean currents also transfer heat through the biosphere and warm or cool the air above them.
Slide 51 / 192 Climate Change
This NASA image shows 63 years of climate change. Can global climate change affect circulation?
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SLIDE 21 Climate and Ecology
The Sonoran desert toad lives in the desert of the southeastern United
- States. While it requires wet areas to
survive, it is able to hibernate during the dry winters by burrowing underground and living off of stored body fat. Each spring, rain wakes the toad and it emerges to reproduce. · If a change in climate created a shorter wet season, how would this affect the Sonoran desert toad? · What types of adaptations would be beneficial in this new climate?
Slide 53 / 192 Climate and Ecology
Off the coast of South America, prevailing winds move coastal waters away from the shore. When this happens, cold nutrient-rich waters from the seafloor rise up to replace the wind- driven water. This is called upwelling. The nutrients brought to the surface from upwelling support a large ecosystem in the surface waters of the ocean. Off the coast of South American, upwelling supports a large anchovy fishery.
Slide 54 / 192 Climate and Ecology
Every 2-7 years, the El Nino Southern Oscillation (ENSO) affects Pacific waters. This is a phenomenon in which atmospheric and
- ceanic circulation patterns are distrupted.
Wind patterns reverse and wind blows water onto the shore. This creates downwelling, instead of upwelling. How would this change in circulation affect abiotic factors in the surface waters? Answer
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SLIDE 22 Climate and Ecology
Every 2-7 years, the El Nino Southern Oscillation (ENSO) affects Pacific waters. This is a phenomenon in which atmospheric and
- ceanic circulation patterns are distrupted.
Wind patterns reverse and wind blows water onto the shore. This creates downwelling, instead of upwelling. How would this change in circulation affect abiotic factors in the surface waters?
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Answer Upwelling increases nutrients to the surface waters. Downwelling would prevent this from happening and the area would experience a decrease in nutrients.
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Climate and Ecology
How would an ENSO event affect anchovy fisheries? What would the anchovies have to do to survive? Answer
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Climate and Ecology
How would an ENSO event affect anchovy fisheries? What would the anchovies have to do to survive?
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Answer ENSO decreases nutrients and makes it harder for anchovies to find food. To survive, anchovies must migrate to areas with more
- food. This causes the anchovy
fishery to collapse.
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SLIDE 23 9 "Today's high will reach the mid-80s with a 20% chance of afternoon precipitation." This is an example of A weather. B climate.
Answer
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9 "Today's high will reach the mid-80s with a 20% chance of afternoon precipitation." This is an example of A weather. B climate.
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Answer A
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10 Greenhouse gases in the atmosphere A act as a shield, protecting Earth from harmful UV rays. B decrease Earth's overall temperature. C act as a blanket, trapping the sun's radiation and increasing Earth's temperature. D affect a region's weather but not the climate.
Answer
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SLIDE 24 10 Greenhouse gases in the atmosphere A act as a shield, protecting Earth from harmful UV rays. B decrease Earth's overall temperature. C act as a blanket, trapping the sun's radiation and increasing Earth's temperature. D affect a region's weather but not the climate.
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Answer C
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11 The surface of the Earth is heated unevenly. What does this cause? A Wind currents B The seasons C The tides D Global warming
Answer
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11 The surface of the Earth is heated unevenly. What does this cause? A Wind currents B The seasons C The tides D Global warming
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Answer A
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SLIDE 25 12 The tropical climate zone is extremely wet and is known for its dense forests. What type of plant adaptation is probably not found in this climate zone? A Vines that climb up trees to reach sunlight. B Drip tips on leaves to quickly shed excess water. C Large leaves to absorb as much sunlight as possible. D Waxy coverings to protect against dessication.
Answer
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12 The tropical climate zone is extremely wet and is known for its dense forests. What type of plant adaptation is probably not found in this climate zone? A Vines that climb up trees to reach sunlight. B Drip tips on leaves to quickly shed excess water. C Large leaves to absorb as much sunlight as possible. D Waxy coverings to protect against dessication.
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Answer D
Slide 60 (Answer) / 192 Community Interactions
Communities interact in a variety of different ways that enable the
- rganisms within them to establish a niche and shape the
ecosystem in which they live. The following are types of interactions within communities: Competition Predation Symbiosis Mutualism Commensalism Parasitism
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SLIDE 26 Competition
When different organisms try to obtain resources in the same place at the same time, competition occurs. The ability to compete for resources is dependent upon whether an
- rganism has adaptations that enable it to thrive in
its environment. Competition in nature drives evolution. Trees in this forest are in competition for light. The tall, broad-leafed trees outcompete the smaller trees for sunlight.
Slide 62 / 192 Predation
Predation occurs when one organism (predator) captures and feeds on another organism (prey). Ladybird beetle eating aphid Cheetah stalking gazelle Great white shark capturing prey
Slide 63 / 192 Predation
Predation is a driving factor in co-evolution. The prey evolves to better escape the predator. In turn the predator evolves to better capture the prey.
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SLIDE 27
Symbiosis
The term symbiosis means "living together." When two species live closely together they are said to be in a symbiotic relationship. There are three main categories of symbiotic relationships: Mutualism Commensalism Parasitism
Slide 65 / 192 Mutualism
In mutualism, both species benefit from the relationship. In this example, the flower provides the hummingbird with nectar and the hummingbird helps the flower reproduce by transporting pollen from one flower to the next. Mutualism: a win/win situation
Slide 66 / 192 Commensalism
In commensalism, one species benefits from the relationshipwhile the other is neither helped nor harmed by it. Barnacles attach to the whale and help themselves to small amounts of plankton (whale food). This behavior does not benefit or harm the whale. Commensalism: a win/neutral situation
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SLIDE 28 Parasitism
In parasitism, one organism benefits while the other organism is harmed. Parasites are organisms that obtain all or most of their nutrients from
- ther organisms, called hosts. The host-parasite relationship benefits
the parasite at the cost of the host. Mosquitoes feed off of the blood of
- ther organisms. Mosquitoes also
carry various types of parasites and viruses that causediseases like yellow fever and malaria. Parasitism: a win/lose situation
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13 When there are not enough resources for all the
- rganisms in a community, what is the result?
A Commensalism B Symbiosis C Competition D Mutualism
Answer
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13 When there are not enough resources for all the
- rganisms in a community, what is the result?
A Commensalism B Symbiosis C Competition D Mutualism
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Answer C
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SLIDE 29 14 Tapeworms live in the intestines of mammals and "steal" nutrients from them. This is an example of A competition. B mutualism. C commensalism. D parasitism.
Answer
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14 Tapeworms live in the intestines of mammals and "steal" nutrients from them. This is an example of A competition. B mutualism. C commensalism. D parasitism.
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Answer D
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15 Which of the following types of community interactions leads to co-evolution? A Predation B Mutualism C Parasitism D All of the above
Answer
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SLIDE 30 15 Which of the following types of community interactions leads to co-evolution? A Predation B Mutualism C Parasitism D All of the above
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Answer A
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16 A relationship in which one organism is helped and another organism is neither helped nor hurt is called A competition. B mutualism. C commensalism. D parasitism.
Answer
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16 A relationship in which one organism is helped and another organism is neither helped nor hurt is called A competition. B mutualism. C commensalism. D parasitism.
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Answer C
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SLIDE 31 17 E. coli live in the human colon where they absorb nutrients and produce vitamin K and sodium that benefit their human hosts. This is an example of A competition. B mutualism. C commensalism. D parasitism.
Answer
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17 E. coli live in the human colon where they absorb nutrients and produce vitamin K and sodium that benefit their human hosts. This is an example of A competition. B mutualism. C commensalism. D parasitism.
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Answer B
Slide 73 (Answer) / 192 Energy Flow
All living systems rely on a constant source of energy. The primary source of energy for life on Earth is the sun.
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SLIDE 32 Energy from the sun is transformed from radiant energy to chemical energy by the process of photosynthesis and from chemical energy to thermal energy (heat) by cellular respiration.
Energy Flow Slide 75 / 192
Recall the chemical equation for photosynthesis: Light energy is used to produce glucose sugar and oxygen And in cellular respiration: Glucose sugar is broken down to release energy.
C6H12O6 + 6O2 6CO2 + 6H2O + ATP (Energy) 6CO2 + 6H2O + Light Energy C6H12O6 + 6O2 Energy Flow Slide 76 / 192
plant
In ecosystems, organisms that obtain energy from sunlight or chemicals to produce food are called autotrophs (auto means self; troph means nourish). Since autotrophs make their own food they are known as producers.
Photosynthetic bacteria contain chloroplasts. Chemoautotrophs
from inorganic chemicals and do not contain chloroplasts.
Autotrophs Slide 77 / 192
SLIDE 33
Heterotrophs
Organisms that rely on other organisms for food and energy are called heterotrophs (hetero means different). Heterotrophs are also referred to as consumers.
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There are several types of heterotrophs: Herbivores - obtain energy by eating only plants Omnivores - eat plants and animals Carnivores - eat animals Detrivores - feed on plant and animal remains Decomposers - break down organic matter
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18 The primary source of energy for all biological life is A glucose sugar. B the sun. C photosynthesis. D cellular respiration.
Answer
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SLIDE 34 18 The primary source of energy for all biological life is A glucose sugar. B the sun. C photosynthesis. D cellular respiration.
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Answer B
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19 Radiant energy from the sun can be directly used as an energy source by all organisms.
Answer
True False
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19 Radiant energy from the sun can be directly used as an energy source by all organisms. True False
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Answer False
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SLIDE 35 20 All autotrophs obtain energy from the sun via photosynthesis.
Answer
True False
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20 All autotrophs obtain energy from the sun via photosynthesis. True False
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Answer False
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21 Which of the following is an example of a consumer? A Photosynthetic bacteria B Blue-green algae C Mushroom D Water lily
Answer
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SLIDE 36 21 Which of the following is an example of a consumer? A Photosynthetic bacteria B Blue-green algae C Mushroom D Water lily
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Answer C
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22 Detritivores like snails and earthworms are
A produce their own food. B have parasitic relationships. C obtain energy by only eating plants. D consume plant and animal remains and other dead matter.
Answer
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22 Detritivores like snails and earthworms are
A produce their own food. B have parasitic relationships. C obtain energy by only eating plants. D consume plant and animal remains and other dead matter.
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Answer D
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SLIDE 37
The flow of energy in an ecosystem can be traced along a food chain - a series of steps in which organisms transfer energy by eating and being eaten.
Energy Flow Slide 85 / 192 Energy Flow
A food web is a diagram that shows the complex interactions and feeding relationships between all organisms in an ecosystem. In most communities, feeding relationships are more complex than can be shown in a single food chain and energy flows in more than one direction.
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23 In this food chain, how many groups of consumers are there? A 1 B 2 C 3 D 4
Answer
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SLIDE 38 23 In this food chain, how many groups of consumers are there? A 1 B 2 C 3 D 4
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Answer D
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24 Which biotic component of this food web is a producer? A Bacteria B Algae C Decayed Material D Daphnia
Answer
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24 Which biotic component of this food web is a producer? A Bacteria B Algae C Decayed Material D Daphnia
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Answer B
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SLIDE 39 25 A food chain shows one pathway of energy in a community while a food web shows all pathways of energy in a community. True False
Answer
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25 A food chain shows one pathway of energy in a community while a food web shows all pathways of energy in a community. True False
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Answer True
Slide 89 (Answer) / 192 Use the information below to complete the food web for an arctic ecosystem
Organism Trophic Type Prey/Food Predators/Grazers algae
primary producer
birds
carnivorous consumer krill, fish seals, killer whales
blue whales
planktivorous consumer algae, krill killer whales
fish
algae, krill birds, seals, killer whales
killer whales
top consumer blue whales, fish, birds, seals
herbivorous consumer algae fish, blue whales, birds
seals
carnivorous consumer fish, birds killer whales
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SLIDE 40 Algae Fish Birds Blue whales Killer Whales Krill Seals
Complete the Food Web Slide 91 / 192 Energy Flow in Ecosystems
As energy flows from the more numerous producers to the decreasing numbers of primary, secondary, and tertiary consumers, some energy is lost as heat. Only 10% of the energy at each level is transferred up to the next highest level in the food chain.
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26 As energy flows through an ecosystem A Only 10% of energy available in one trophic level is passed to the next level B Very little energy is lost as heat C From producer to consumer the amount of energy within each trophic level increases D All of the above
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SLIDE 41 27 As energy flows through an ecosystem A Only 10% of energy available in one trophic level is passed to the next level B Very little energy is lost as heat C From producer to consumer the amount of energy within each trophic level increases D All of the above
Slide 94 / 192 Ecological Succession
Change is inevitable within communities - older members die, new organisms immigrate, sudden disturbances force change, etc. Ecological succession is the term used to describe the series of expected changes that occur within the community of an ecosystem
The first photo shows a forest one year after a forest fire. The second picture is the same forest two years after the fire.
Slide 95 / 192 Primary Succession
Primary succession refers to the founding of new communities in environments that initially had no living organisms, like rocks or new surfaces formed by volcanic eruptions or the movements of glaciers. The retreat of a glacier left behind this bare rock that can now undergo primary succession.
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SLIDE 42 Pioneer Species
In primary ecological succession, the first organisms to populate an uninhabited environment are called the pioneer species. Lichen is the first organism to grow on the bare rock. It is the pioneer species.
Bare rock left after retreat of a glacier.
Time
Lichens, followed by moss, begin growing on the rock. As they die, the decaying matter is added to the rock, producing soil.
Pioneer Species
Slide 97 / 192 Primary Succession
Bare rock left after retreat of a glacier.
Time
Lichens, followed by moss, begin growing
die, the decaying matter is added to the rock, producing soil.
Grasses and small plants start to grow. Nutrients supplied by decaying organic matter support the growth of grasses and small plants. These add more organic nutrients, which form deeper more fertile soil.
Slide 98 / 192 Primary Succession
Decaying organic matter create deeper soils that can hold
- water. This allows shrubs to grow.
Bare rock left after retreat of a glacier.
Time
Lichens, followed by moss, grow on the rock. As they die, the decaying matter is added to the rock, producing soil. Grasses and small plants start to grow.
Small shrubs colonize.
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SLIDE 43 Climax Communities
Finally, larger trees can grow, and climax communities form. Climax communities are the organisms that remain stable in an ecosystem over time.
Time
Climax communities develop on mature soils.
Bare rock left after retreat of a glacier. Lichens, followed by moss, grow on the
decaying matter is added to the rock, producing soil. Grasses and small plants start to grow. Small shrubs colonize.
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Secondary Succession
After ecosystems are dramatically altered by fires, floods, disease,
- r human activity, community interactions often restore
ecosystems to their original condition. The reestablishment of climax communities in an ecosystem is called secondary succession. Ground is cleared
community to grow a single crop. Ground is abandoned and new species begin to grow. Small shrubs again colonize. New climax community forms.
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28 The progression from rock lichen moss grasses pine trees deciduous trees in an ecosystem is an example of A evolution. B a food web. C primary succession. D secondary succession.
Answer
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SLIDE 44 28 The progression from rock lichen moss grasses pine trees deciduous trees in an ecosystem is an example of A evolution. B a food web. C primary succession. D secondary succession.
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Answer C
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29 The first species to move into an uninhabited environment is called the A pioneer species. B climax community. C ancestral species. D divergent species.
Answer
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29 The first species to move into an uninhabited environment is called the A pioneer species. B climax community. C ancestral species. D divergent species.
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Answer A
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SLIDE 45 30 Secondary succession follows what kind of an event? A Fire B Human alteration C Flood D All of the above
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30 Secondary succession follows what kind of an event? A Fire B Human alteration C Flood D All of the above
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31 A climax community A continually changes. B remains stable over time.
Answer
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SLIDE 46 31 A climax community A continually changes. B remains stable over time.
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Answer B
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Nutrient Cycles
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Slide 106 / 192 Nutrient Cycles
Energy constantly radiates from the sun to the earth and is transformed into forms of energy living organisms can use to sustain life. However, organisms need more than energy to survive - they need water, minerals, and the chemical compounds like carbon dioxide and oxygen that allow photosynthesis, respiration, and
- ther essential chemical reactions to
take place.
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SLIDE 47 32 The cycling of nutrients through an ecosystem would be considered what type of factor? A Abiotic B Biotic
Answer
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32 The cycling of nutrients through an ecosystem would be considered what type of factor? A Abiotic B Biotic
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Slide 108 (Answer) / 192 Nutrient Cycles
Biogeochemical cycles refer to to the pathways through which a chemical moves through the biosphere. The primary biogeochemical cycles studied in ecology are: Water Cycle Carbon Cycle Nitrogen Cycle Phosphorous Cycle
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SLIDE 48 Primary producers like plants typically obtain nutrients from their environment. Consumers obtain nutrients by eating other organisms. Carbon, nitrogen, and phosphorous are all key nutrients that cycle through the biosphere.
Nutrient Cycles Slide 110 / 192 The Water Cycle
Water is essential to living organisms. Click the picture above to watch a video about the water cycle.
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Most water molecules are taken up into the clouds by evaporation and transpiration. The water returns to the oceans, lands, and lakes by precipitation. Water that enters the soil returns to the
The Water Cycle Slide 112 / 192
SLIDE 49 33 Describe the direction of water molecules during transpiration. A oceans to atmosphere B atmosphere to oceans C atmosphere to plants D plants to atmosphere
Answer
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33 Describe the direction of water molecules during transpiration. A oceans to atmosphere B atmosphere to oceans C atmosphere to plants D plants to atmosphere
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Answer D
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34 Water that enters the soil returns to the ocean via what process? A Precipitation B Runoff C Condensation D Transpiration
Answer
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SLIDE 50 34 Water that enters the soil returns to the ocean via what process? A Precipitation B Runoff C Condensation D Transpiration
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Answer B
Slide 114 (Answer) / 192 The Carbon Cycle
Click the picture above to watch a video about the carbon cycle.
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Carbon is moved through the biosphere in four main ways:
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SLIDE 51 Summary: · Most carbon is found in the atmosphere. · Carbon is used by plants to form sugars, which are eaten by animals. · Carbon is recycled to the atmosphere by cellular respiration. · Human activities like burning of fossil fuels also release carbon into the atmosphere.
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35 Most carbon is found A as carbon dioxide. B in plants. C in fossil fuels. D as glucose.
Answer
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35 Most carbon is found A as carbon dioxide. B in plants. C in fossil fuels. D as glucose.
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Answer A
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SLIDE 52 36 How is carbon returned to the atmosphere? A Organisms release it during respiration. B It is released during the burning of fossil fuels. C It is released during volcanic activity. D All of the above.
Answer
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36 How is carbon returned to the atmosphere? A Organisms release it during respiration. B It is released during the burning of fossil fuels. C It is released during volcanic activity. D All of the above.
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Answer D
Slide 119 (Answer) / 192 The Nitrogen Cycle
Nitrogen is the an important nutrient found in all amino acids. All organisms from bacteria to humans require nitrogen to make proteins.
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SLIDE 53 Most nitrogen is found as a gas in the atmosphere, but this form is unavailable for protein synthesis. Bacteria in soil fix nitrogen so that it can be used by plants and
called nitrogen fixation.
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The process of nitrogen fixation
- ccurs due to an amazing symbiotic
relationship between a genus of bacteria called Rhizobium and legumes (bean and pea plants). The bacteria live inside plant roots, where they cause the formation of root nodules. They receive nutrients from the plants and, in return, they fix atmospheric nitrogen into a form that can be used by the plants.
The Nitrogen Cycle Slide 122 / 192 The Nitrogen Cycle Slide 123 / 192
SLIDE 54 37 Animals obtain nitrogen via A ingestion of bacteria. B ingestion of plants. C direct absorption of atmospheric nitrogen. D denitrification.
Answer
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37 Animals obtain nitrogen via A ingestion of bacteria. B ingestion of plants. C direct absorption of atmospheric nitrogen. D denitrification.
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38 Nitrogen fixation occurs when A plants release nitrogen into the atmosphere. B bacteria convert nitrates into atmospheric nitrogen. C bacteria convert atmospheric nitrogen into ammonium. D decomposers release nitrogen into the soil.
Answer
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SLIDE 55 38 Nitrogen fixation occurs when A plants release nitrogen into the atmosphere. B bacteria convert nitrates into atmospheric nitrogen. C bacteria convert atmospheric nitrogen into ammonium. D decomposers release nitrogen into the soil.
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Answer C
Slide 125 (Answer) / 192 The Phosphorous Cycle Slide 126 / 192
Phosphorous is an essential nutrient because it is a building block for RNA, DNA, and ATP. Unlike carbon and nitrogen, phosphorous is not abundant in the atmosphere and is mostly found on land in rocks, soil, and ocean sediment.
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SLIDE 56 Most phosphorous is stored in the form of inorganic phosphate within rocks and sediment until they eventually wear down and release the phosphate. Phosphate molecules can be washed into rivers, streams, and eventually the ocean where they are used by marine organisms. Phosphate that remains in the soil is absorbed into plants that convert them into organic compounds to be useful to living organisms.
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39 Most phosphorous is found A in the atmosphere. B in plants and animals. C in rocks and sediments. D in bacteria.
Answer
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39 Most phosphorous is found A in the atmosphere. B in plants and animals. C in rocks and sediments. D in bacteria.
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Answer C
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SLIDE 57
Nutrient Limitation
All of the nutrients discussed are necessary to maintain a healthy, productive ecosystem. When a organism's productivity is slowed by one nutrient that is in limited supply, that nutrient is referred to as the limiting nutrient.
Slide 130 / 192 Nutrient Limitation: Fertilizers
Nitrogen and phosphorous are limiting nutrients for most plants. To ensure the highest productivity from crops, farmers apply fertilizers that contain nitrogen and phosphorous. If too much fertilizer is applied, however, the extra nutrients are not absorbed by the plants and they remain in the soil. This negatively affects the environment.
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When extra nutrients run out of farmland and into the water supply, it can cause algal blooms. Like plants, algae are also limited in growth by nitrogen and phosphorous availability. When fertilizers run into the water, they are able to grow at higher levels than normal. An algal bloom picture in the Bay of Biscay as seen from a satellite.
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SLIDE 58 Rain Fertilized soil runs off field and into aquatic ecosystem (lake). Extra nutrients in fertilized soil stimulate the rapid growth of producers like algae. If there are not enough consumers to eat the algae, algal bloom can occur. The amount of algae in the water reduces the oxygen supply. Reduced oxygen supply results in lower numbers of more complex plants and consumers like fish. Ecosystems can be damaged by runoff.
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40 A low supply of nitrogen in soil prevents certain crops from
- growing. In other words, nitrogen is the
A limiting reagent. B organic compound. C limiting nutrient. D abundant nutrient.
Answer
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40 A low supply of nitrogen in soil prevents certain crops from
- growing. In other words, nitrogen is the
A limiting reagent. B organic compound. C limiting nutrient. D abundant nutrient.
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Answer C
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SLIDE 59 41 Why would an algal bloom result in lowered fish populations? A Fish have no limiting nutrients. B The fish population is overcrowded. C Algae compete with fish for food. D Fish cannot survive in the reduced oxygen levels created by increased algae.
Answer
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41 Why would an algal bloom result in lowered fish populations? A Fish have no limiting nutrients. B The fish population is overcrowded. C Algae compete with fish for food. D Fish cannot survive in the reduced oxygen levels created by increased algae.
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Answer D
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Conservation Biology
Return to Table of Contents
· Biodiversity · Human Impact · Conservation · Sustainable Development
Click on the topic to go to that section
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SLIDE 60 Biodiversity
The constant flow of energy from the Sun and the cyclic flow of matter through the biosphere make the Earth a self-sustaining system able to support a diverse array of life. Biodiversity refers to the variation
- f life. The earth is home to an
amazing range of biodiversity with an estimated +1.7 million species in existence today.
Slide 137 / 192 Disturbance
Fire
A disturbance is an event that changes the biodiversity of a community by removing organisms or altering resource availability. Some disturbances are positive while others are negative. Examples of disturbances: Fire Human Activity Flood Drought
Slide 138 / 192 42 Earlier in the chapter, you learned that weather and climate are important to understand when studying ecology. · What type of disturbances could weather and climate cause? · How could weather/climate disturbances affect biodiversity?
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SLIDE 61
Ecosystem Resiliency
Some ecosystems are very resilient and can bounce back from disturbances over relatively short periods of time. Forest fires and secondary succession that follows a fire are often healthy disturbances that benefit the ecosystem in a positive way.
Slide 140 / 192 Ecosystem Resiliency
Other ecosystems take a long time to recover from damage and may never be fully restored. Many species are not able to survive the degradation of their habitat, which leads to a reduction in biodiversity within ecosystems. Water pollution in a wetland.
Slide 141 / 192 Human Impact
Humans are active participants in food webs and chemical cycles within the biosphere. Like all living organisms, we depend upon the natural environment for food, water, and shelter. How we do so impacts our surroundings.
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SLIDE 62 The Industrial Revolution dramatically altered how humans impacted their environments. Science and technological innovations led to the development of machines and the ability to harness energy to power them. James Watt invented a steam engine powered by coal that could be used to run textile factories. Click here to watch a video about the Industrial Revolution.
Industrial Revolution Slide 143 / 192
Products that were made by hand and considered luxuries enjoyed by only a small group of humans became mass produced by machines in factories so that more people could buy and use them. This lead to an increased demand for raw materials - the natural resources used to make products.
Industrial Revolution
Rubber Tree Crude Oil Copper Cotton
Slide 144 / 192 Natural Resources
Natural resources include abiotic and biotic factors that naturally
- ccur in an environment and can be used by organisms for food,
shelter, and survival. Natural resources fall into two major categories: Renewable Resource Nonrenewable Resource Bamboo forest Coal
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SLIDE 63 Renewable Resources
Renewable resources can be regenerated or replenished by the cycling of matter. Although these types of resources are replaceable, there are limits to how much is available at a given time.
Slide 146 / 192 Renewable Resources
Most fresh water consumed by humans is found deep below the ground. Fresh water supplies may be limited by drought, overuse, and pollution.
Slide 147 / 192 Nonrenewable Resources
Nonrenewable resources are mined from the Earth and cannot be replenished. Fossil fuels - coal, oil, and natural gas - formed over hundreds of millions of years as
- rganic matter decayed under
pressure. Once used, they are gone forever.
Coal
Oil drilling platform
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SLIDE 64 Urban Growth
Industrial development demanded increased use of renewable and nonrenewable resources. It also provided access to new goods and services and a new niche for humans. Urban areas became centers of industry and people began leaving agrarian societies to work and live in cities.
Slide 149 / 192 Human Population Growth
Human population growth has exploded over the past 200 years due to improvements in agriculture, medicine, sanitation, energy use, and technology. Current world population:
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43 Which of the following is not a result of the Industrial Revolution? A It increased urban growth. B It made goods more accessible to humans. C It decreased the use of renewable resources. D It allowed people to leave the agrarian world.
Answer
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SLIDE 65 43 Which of the following is not a result of the Industrial Revolution? A It increased urban growth. B It made goods more accessible to humans. C It decreased the use of renewable resources. D It allowed people to leave the agrarian world.
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Answer C
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44 Renewable resources are always available. True False
Answer
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44 Renewable resources are always available. True False
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Answer False
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SLIDE 66 45 Current human population growth most closely resembles which pattern of population growth? A Logistic B Exponential C Linear D Energetic
Answer
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45 Current human population growth most closely resembles which pattern of population growth? A Logistic B Exponential C Linear D Energetic
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Answer B
Slide 153 (Answer) / 192 Human Impact
Due to our high consumption of natural resources and rapid population growth, humans currently use as much energy and transport nearly as many materials as all of the other multicellular
- rganisms in the biosphere combined.
Our ecological footprint - measure of demand on ecosystems - is huge and our activities have an increasingly large impact on the biosphere. Click here to determine your ecological footprint. Humanity is currently using the resources of 1.5 Earths to meet our needs.
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SLIDE 67 Human Impact
There are several human activities that impact the biosphere in a negative way.
Slide 155 / 192 Hunting
In the early 20th century, hunting and habitat destruction led to the extinction
Due to overfishing, bluefin tuna are the 6th most endangered species in the world. They are currently considered critically endangered.
Slide 156 / 192 Agriculture
Humans began growing crops and raising animals 11,000 years ago. Farming provided a stable and predictable food supply, encouraging development of human societies.
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SLIDE 68 Agriculture
Farming has changed considerably over the past 200 years. Food production has increased due to the use
*machinery *irrigation systems *fertilizers *monoculture - planting a single crop in a large field Can you think of one way each of the above affect the ecosystem?
Slide 158 / 192 Environmental Degradation
Human activities have polluted land, water, and air as well as physically altered habitats, resulting in habitat degradation and displacement or death of species. For example, air pollution has led to acid rain that negatively affects habitats.
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Environmental Degradation
Clearing land for agriculture or urban development destroys natural habitats, reduces primary production and affects air quality . Accessing fossil fuels requires invasive and dangerous extraction practices. This pelican is a victim of an oil spill. Burning of fossil fuels releases toxic chemicals into the air. This leads to health issues and air pollution. Toxic waste is material produced by industry that can kill or harm living organisms.
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SLIDE 69
Global Climate Change
Burning fossil fuels emits high amounts of carbon dioxide and methane gas into the atmosphere - thickening the layer of greenhouse gases surrounding Earth. Explain the effect increased greenhouse gases would have on Earth's climate.
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Increasing levels of atmospheric CO2 are correlated with increasing temperatures.
Global Climate Change Slide 162 / 192 Global Climate Change
Consequences of global warming: · melting of polar ice caps · rising sea levels · flooding of coastal areas · disruption of habitat resulting in migration and extinction Click here to watch a video about global warming.
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SLIDE 70 46 How would global warming affect ocean currents?
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Answer
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46 How would global warming affect ocean currents?
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Answer Ocean currents exist as a result of differences in density due to varying temperatures. As global warming causes the ice caps to melt and ocean temperatures to increase, the ocean currents would slowly cease to exist.
Slide 164 (Answer) / 192 Invasive Species
Globalization means that natural resources all over the world are being used and transported from place to place. These resources include plants, animals, bacteria, and fungi. When humans transport species to new habitats, they can become invasive species . The kudzu plant was brought to the US from Japan. Its uncontrolled growth can cover entire areas.
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SLIDE 71 Invasive Species
Invasive species are non-native species that adversely affect their new habitat. Invasive species often reproduce rapidly because their new habitats do not have the same predators or parasites that regulated their population size in their original habitats. Effects of invasive species · prey on native species ·
for resources · carry diseases · disrupt reproduction of native species Zebra mussels arrived in the US from Eurasia via ship ballast water. They outcompete native species for food and habitat.
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47 Acid rain results when A fertilizers run into the rivers and oceans. B toxic waste evaporates into the atmosphere. C global warming decreases CO2 in the atmosphere. D acidic gases dissolve in rain water.
Answer
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47 Acid rain results when A fertilizers run into the rivers and oceans. B toxic waste evaporates into the atmosphere. C global warming decreases CO2 in the atmosphere. D acidic gases dissolve in rain water.
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Answer D
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SLIDE 72 48 Which of the following is not a result of deforestation? A Increased biodiversity. B Decreased habitat. C Decreased primary production. D Increase in air quality issues.
Answer
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48 Which of the following is not a result of deforestation? A Increased biodiversity. B Decreased habitat. C Decreased primary production. D Increase in air quality issues.
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Answer A
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49 The use of fossil fuels negatively affects the environment. Which is not an result linked to fossil fuels? A Oil spills B Air pollution C Drought D Health issues
Answer
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SLIDE 73 49 The use of fossil fuels negatively affects the environment. Which is not an result linked to fossil fuels? A Oil spills B Air pollution C Drought D Health issues
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Answer C
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50 If global warming continues, which of the following will result? A Sea levels will rise. B Biodiversity will increase as habitat is destroyed. C Polar ice caps will refreeze. D Ocean currents will intensify.
Answer
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50 If global warming continues, which of the following will result? A Sea levels will rise. B Biodiversity will increase as habitat is destroyed. C Polar ice caps will refreeze. D Ocean currents will intensify.
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Answer A
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SLIDE 74 51 Cogongrass is native to Asia. It has spread to the US, where it outcompetes native grasses for resources. Some areas have started using herbicide as a method for eradication of the grass. How has cogongrass affected the local environment? A It displaces native grasses. B It increases regional biodiversity. C It causes increased runoff due to the use of herbicides. D All of the above. E Both A and C.
Answer
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51 Cogongrass is native to Asia. It has spread to the US, where it outcompetes native grasses for resources. Some areas have started using herbicide as a method for eradication of the grass. How has cogongrass affected the local environment? A It displaces native grasses. B It increases regional biodiversity. C It causes increased runoff due to the use of herbicides. D All of the above. E Both A and C.
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52 What would cogongrass be considered? A Endemic species B Invasive species C Native species D Primary species
Answer
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SLIDE 75 52 What would cogongrass be considered? A Endemic species B Invasive species C Native species D Primary species
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Answer B
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As human populations continue to increase, we will continue to impact the biosphere in negative ways. The study of ecology has helped humans to understand how healthy ecosystems function to supply the Earth with resources needed to support life. We must use principles of conservation and sustainable development to care for and maintain our home.
Conservation and Sustainable Development Slide 173 / 192
Conservation
Conservation involves the management of natural resources and the protection of communities in order to preserve healthy functioning ecosystems. Conservation practices include regulating the use of resources, restoring damaged environments, and protecting habitats from human alteration.
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SLIDE 76 Land Conservation
Methods for land and soil conservation: · Plant windbreaks · Rotate crops · Terrace farming or contour plowing · Leave roots and stems in the ground · Replant forests This red pine forest was replanted 21 years ago.
Slide 175 / 192 Water Conservation
Methods of water conservation: · Preserve the fresh water supply by preventing pollutants from being dumped into rivers and streams · Restore wetlands that help purify water · Employ methods that prevent the waste
- f freshwater like drip irrigation
· Reuse "graywater" (dirty water) for flushing toilets or watering gardens · Use low flow shower heads and toilets and high efficiency washing machines
Slide 176 / 192 Atmosphere Conservation
Methods of conserving air resources: · Reduce use of chemicals that pollute or damage the atmosphere · Remove pollutants by using afterburners or catalytic converters when burning fossil fuels · Reduce the amount of fossil fuels used This is a public bicycle rental station in Lyon, France. Decreasing automobile use decreases fossil fuels in the atmosphere.
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SLIDE 77 Biodiversity Conservation
Methods of conserving biodiversity: · Protect habitats by banning dumping of waste or urban development · Reserve land for national parks, forests, marine sanctuaries · Help prevent species extinction by establishing breeding programs for endangered species
Slide 178 / 192 Energy Conservation
Methods of conserving energy: · Reduce energy consumption by walking, biking, or taking public transportation · Increase use of energy efficient products and building design
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53 Choose one aspect of conservation and construct three guidelines for your school to follow.
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SLIDE 78 Sustainable Development
In order for ecosystems to maintain a healthy balance, consumption of natural resources must equal the environment's ability to replenish them. Sustainable development is a pattern of resource use and production that meets human needs while preserving the well- being of the environment.
Slide 181 / 192 Sustainable Development
Alternative energy resources must be developed to meet our energy requirements sustainably. Some options include: Wind Biofuel Solar Hydro Nuclear
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Biofuels are fuels derived from biomass like agricultural
- crops. They include ethanol and other forms of biodiesel.
Pros: · Renewable · Emit less carbon dioxide than fossil fuels Cons: · Growing biofuel crops reduces world food supply. · Producing biofuels requires large amounts of energy.
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SLIDE 79 Nuclear energy is energy produced by nuclear fission. Pros: · Produces high amounts of energy · Reduces carbon emissions Cons: · Can expose humans and
- ther organisms to harmful
nuclear radiation · Nuclear waste takes thousands of years to degrade and must be safely stored
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In addition to utilizing sustainable forms of energy, sustainable materials that support our lifestyle must also be developed. Biomimicry refers to the use of natural models, systems, and processes to design products and solve problems. For example, velcro was inspired by the tiny hooks found on cockleburs.
Sustainable Development Slide 185 / 192
Green building design creates buildings with innovative design ideas that minimize energy
innovations are inspired by nature.
Sustainable Development Slide 186 / 192
SLIDE 80 Source: Environmental Health Watch, www.ehw.org
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Some types of waste are biodegradable and can be naturally broken down by
- rganisms that live in the soil.
One aspect of sustainable development involves creating new products that are biodegradable so that permanent waste does not accumulate and degrade the environment.
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Bioplastics are plastics that are made from organic materials instead of oil and can, therefore, be broken down in a compost environment .
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SLIDE 81 Micromidas is a biotechnology company in California that is using organic material from waste water treatment plants as feedstock for bacteria that can naturally metabolize it and create bioplastics as a bi-product.
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54 What is one drawback to using biofuels as an alternative energy source? A Biofuels reduce carbon dioxide emissions. B Biofuels reduce the amount of organic matter in an ecosystem. C Biofuels require high amounts of energy to produce. D Biofuels are not renewable.
Answer
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54 What is one drawback to using biofuels as an alternative energy source? A Biofuels reduce carbon dioxide emissions. B Biofuels reduce the amount of organic matter in an ecosystem. C Biofuels require high amounts of energy to produce. D Biofuels are not renewable.
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SLIDE 82 55 What barriers do you think exist that might prevent wide-scale implementation of sustainable practices?
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