Relationship between Water Flow and Animal Size. Variables Control variables: Water depth, river bed...
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Transcript of Relationship between Water Flow and Animal Size. Variables Control variables: Water depth, river bed...
Relationship between Water Flow and Animal
Size
Variables
Control variables: Water depth, river bed substrate composition, light intensity, water temperature
Independent variable : Water flow rate
Dependent variables: Animal species(size of animals), abundance of individuals, adaptions of water flow
Hypothesis
Animals with larger size can rarely adapt high water flow rate due to larger surface area to volume ratio.
Materials
Water flow meter
Light meter
Digital thermometer
Brush pen
Quadrat
Metal sieve
Measuring tape
Forceps
Plastic sorting tray
Methods
1, Select four localities with different flow rate by using flow meter.
2, Set a quadrat at each localities
3, Measure the light intensity, water depth, and water temperature, make sure they are similar.
4, count the abundance of different species
Results
Flow rate (m/s)
0 0.02 0.1 0.12
Water penny
0 0 1 3
Stonefly
nymph1 0 3 1
stream snail
11 (large)
36(large)
1 40
Predace-ous
chub7 0 0 0
Analysis
Most animals found in high water flow rate are smaller in size, including large stream snail, stonefly nymph and water penny.
Larger animals (predaceous chub) are found in slow water flow rate quadrat.
Discussion
The larger sizes of animals, the larger surface area to volume ratios. They are easily washed away at high water flow rate. They cannot withstand large water current and vice versa.
Summary
The hypothesis can be supported by results.
So, in slow water flow there are more animals with relatively larger size.
The end