13 Jan Lab 8: Ecological Interactions
Grade: __ /27 points
Participate in the lab 8 study group before Sunday March 11 for an additional 8 points.
Your Name: _______________________
Save your document as “first_name last_name Lab 8.doc” and submit in assignment folder.
Biology 102
Lab8: Ecological Interactions
Experiment 1: Ecological Interactions (27 points)
Table 1: Volume and Concentration Totals
Trophic Level
Cylinder
Volume of H2O
Volume of Oil
Total Volume
% Oil
1st
1000 ml
1000 ml
2nd
100 ml
100 ml
3rd
10 ml
10 ml
Questions
What is the % concentration of oil in the first, second, and third trophic levels in our food chain?
How did the concentration of oil change from one trophic level to the next?
How does the change in concentration represent biomagnification? (200-500 words)
How does this also illustrate the amount of energy transferred from one trophic level to the next? (200-500 words)
Lab 8
Ecology
Ecological Interactions
82
Lab 8: Ecological Interactions
83
Introduction
An ecosystem is composed of communities or associations of numerous populations of living animals
and plants at a particular time. Each organism within a community has a habitat and a niche. An organism’s
habitat is the location of where he physically resides or is adapted to reside and an organism’s
niche refers his function or “occupation”. Occupation for an organism is the way in which the organism
obtains and sustains all of the elements needed for survival.
Figure 1: There is great variety in the habitats across the globe. From the driest of deserts to the wettest
swamps, creatures have learned to thrive in many environments.
The dynamics of an ecosystem and the complexity of its habitats are a variable of energy flow, nutrient
Concepts to explore:
??Habitat
??Trophic levels
Lab 8: Ecological Interactions
84
cycling, and water. Organisms can either be producers or consumers in terms of energy flow.Autotrophs
(organisms that make their own food) are the critical link between solar radiation and every
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