Biological Relationships I can evaluate the ways in which organisms - - PowerPoint PPT Presentation

Biological Relationships

I can evaluate the ways in which organisms interact.

Types of Biological Relationships

• There are two major types of biological relationships:

Predator-Prey Symbiosis

Predation

• Predation is a biological relationship where a predator

feeds on its prey

• This relationship benefits (+) the predator and harms (-) the

prey

• Prey can include plants eaten by herbivores

• Predator and prey populations directly impact each
• ther
• A population is a group of the same species
• Population numbers fluctuate (go up and down) in relation to

each other

Symbiosis

• A biological relationship

in which two distinct

• rganisms live together

for the benefit of one or both

Sym- meaning

• bio

with life

Types of Symbiosis

• The three types of symbiotic relationships are:

Mutualism Commensalism Parasitism

Mutualism

• a biological relationship between two organisms in

which both benefit

(+)/(+) ant (+) gets honeydew from aphid aphid (+) is protected from predators

Commensalism

• a biological relationship between two organisms in

which one benefits and the other is not affected

(+)/(0) water buffalo (0) not affected cattle egret (+) eats insects released by grazing cattle

Parasitism

• a biological relationship in which one organism (a

parasite) benefits and the other (the host) is harmed

(+)/(-) host bird (-) must raise young of a different species, loss

• f resources

cowbird (+) brood parasite is raised by another bird