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Transcript of Gammarus setosus
Objective: To understand how temperature, as an abiotic factor, affects the speed of movement of
Temperature will not have an effect on the rate of movement of
, measured by the distance traveled in 30 seconds.
Temperature will have an effect on the rate of movement of
measured by the distance traveled in 30 seconds.
Slower activity rate at 30°C
Highest activity rate at 20°C
Slowest at 7°C and 10°C
1. Use a string to measure the distance traveled
2. Calculate the mean speed
- Blank acetate sheets
- Petri dish
- 35°C Water bath
Comparisons with other Studies
Lagerspetz and Vainio (2005) 's experiment
Tested the effect of temp. on motor activity of
Different time control, treatment levels
Result: From higher to lower activity level (13℃, 25℃, 5℃)
Support our result
Source of Variations
Extraneous abiotic factor
Reduction in biological variation
choose similar sizes of organisms
Finally, supported by the results obtained from this experiment, we concluded that temperature does have an effect on the rate of movement of
Response & Sensory Organs
Sensory organ: Microtrich sensilla
. Speed in centimetres per second of Gammarus Setosus after 30 seconds at 7 °C. 20 °C and 30 °C in Trial 2. Bars represent 95% confidence intervals, n=7 for each treatment.
. Speed in centimetres per second of Gammarus Setosus after 30 seconds at 10 °C. 20 °C and 30 °C in Trial 1. Bars represent 95% confidence intervals, n=5 for each treatment
1. Randomly pipette a G. setosus into a medium stacking dish
2. Immediately start the timer (60 seconds)
3. When 30 sec left, place a petri dish top the stacking dish and trace the movement
Four fused abdominal ganglia
Natural Habitats & Abiotic Factors
shaded intertidal tidepools
shallow subtidal areas
: gravels/rocks as shelter
: avoid direct tidal wave movement
: 0 to 35ppt
: 0 to 30°C
Effect of Temperature
Specifically, temperature affects:
- the duration of embryotic development
- the timing of spawning
- how well are the hatchling fed
- the percentage of hatchling surviving
until sexual maturity
body temperature highly rely on environmental condition
Change in temperature affects reproduction, growth, and overall survival.