T opic: Relationship between water flow rate and animal species - - PowerPoint PPT Presentation

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Relationship between water flow rate and animal species

Variables

Controlled variables:water depth , light intensity,river bed substrate composition,temperature Dependent variables :animal species , abundance

• f individuals,adaptions to water flow

Independent variable: water flow rate

Hypothesis

1.Water flow rate increase------Number of species increases. Because higher water flow rate --------more dissolved oxygen and more food 2.higher water flow rate ----more organism with special adaptive structure.

Materials and methods

For controlled variables : 1.water depth: select areas with similar depth by using ruler 2.light intensity : select areas with similar depth by using light meter.3.water temperature :by using digital thermometer For independent variable :measure the water flow rate using water flow meter Methods to record : Use quadrat sampling method to

• bserve the species and population density of animals.

......

Results

1 2 3 4 Water flow rate 0.02 0.11 0.25 0.36 T emperatu re 22.6 21.1 21.7 22 Depth 7.4 7.5 7.5 7.6 Light intensity 9000 9000 10000 9000

R e s u l t s

1 2 3 4 Viviparous snail⽯矴⽥由螺 36 30 2 Large stream snail海南捲螺 2 1 10 Water skater⽔氵⿌黾 6 2 Water penny⽔氵錢 1 13 Stonefly nymph⽯矴⿌黾若蟲 2 2 Dragonfly nymph蜻蜓若蟲 3 1 Canton bee shrimp廣東⽶籴蝦 1 Sucker belly laoch⿆麦⽒氐擬腹泥 鰍 2 Damselfly nymph⾖豇娘若蟲 1 1

analysis/summary

Quadrat 4----- highest flow rate ----- highest number of species ----more oxygen and food Quadrat 4----- more species with adaptive feature eg.streamlined,suckers-----to prevent being washed away Higher water flow rate ----less viviparous snails

The end-