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Gammarus setosus

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by

Jeanette Wong

on 27 November 2013

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Transcript of Gammarus setosus

Qualitative Observations
Gammarus setosus
Introduction
Method
Discussion
Category
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Malacostraca
Order: Amphipoda
Family: Gammaridea
Objective: To understand how temperature, as an abiotic factor, affects the speed of movement of
Gammarus setosus
.
Emily Sun
Jeanette Wong
Jeanne Yuan
Roxanne Ho

Hypotheses
Null Hypotheses:
Temperature will not have an effect on the rate of movement of
Gammarus setosus
, measured by the distance traveled in 30 seconds.

Alternate Hypotheses:
Temperature will have an effect on the rate of movement of
Gammarus setosus,
measured by the distance traveled in 30 seconds.
Prediction
Slower activity rate at 30°C

Highest activity rate at 20°C

Slowest at 7°C and 10°C
Equipment
Measurement
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
Asellus aquaticus
Similar procedure
Different time control, treatment levels
Result: From higher to lower activity level (13℃, 25℃, 5℃)
Support our result
Source of Variations
Equipment error
Human Error
Biological variation
Extraneous abiotic factor
Chance occurance
Future Improvement
Reduction in biological variation
choose similar sizes of organisms
Reject Ho
Conclusion
Finally, supported by the results obtained from this experiment, we concluded that temperature does have an effect on the rate of movement of
Gammarus setosus
.
Biological Process
Response & Sensory Organs
Sensory organ: Microtrich sensilla
chemosensation
mechanosensation
Source: http://www.jstor.org/discover/10.2307/25027517?uid=2134&uid=2475402737&uid=2&uid=70&uid=3&uid=2475402727&uid=60&purchase-type=article&accessType=none&sid=21102998272111&showMyJstorPss=false&seq=4&showAccess=false
Results
Figure 2
. 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.
Figure 1
. 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

Experiement
Four fused abdominal ganglia
Natural Habitats & Abiotic Factors
Natural Habitats:
shaded intertidal tidepools
shallow subtidal areas
source: http://msubiology.info/shipunov/belomor/foto/gam_set.htm
Abiotic Factors:
substratum characteristic
: gravels/rocks as shelter
water movement
: avoid direct tidal wave movement
salinity
: 0 to 35ppt
others:
light intensity,

light wavelength
temperature
: 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
Ectothermal organisms:
body temperature highly rely on environmental condition
Change in temperature affects reproduction, growth, and overall survival.
Sensory Organ
Biological Process
Microtrich sensilla
chemosensation
mechanosensation
Source: http://www.jstor.org/discover/10.2307/1548624?uid=2&uid=4&sid=21103003993361
Full transcript