a) Define "trophic levels". Provide a specific example of four species and describe their trophic-level relationships.
b) Trace energy flow through your sample community.
c) Trace contaminant flow (for example, DDT) through your sample community.© BrainMass Inc. brainmass.com October 24, 2018, 9:26 pm ad1c9bdddf
A trophic level contains a group of organisms united because they obtain their energy from the same part of the food web in a biological community. A maple tree, for example, obtains its energy from the sun. Therefore, it is in the primary or first trophic level. The same could be said of all plants: rose bushes, grass, etc. A rabbit, on the other hand, is a herbivore. It eats plants. Therefore, it belongs to the second trophic level. Other animals that would share this trophic level would be a grasshopper, a caterpillar, a mouse, and a vegetarian human. Examples of organisms in the third trophic level would be carnivores, any organism ...
This solution is completed in about 450 words. This response begins by outlining the importance of the trophic level concept, providing examples, and then sets up a sample community to discuss the flow of energy transfers.
Energy flow in ecosystems
In the pre-1850 grasslands of North America there were hundreds of millions of grazing animals such as buffalo, antelope and deer. At the same time there were many fewer meat eaters, such as wolves. Explain in terms of energy flow in ecosystems and the Second law of Thermodynamics why there were so many grazers and so relatively few meat eaters. Would you expect more plants (such as grasses) tahn grazes, or fewer in the pre-1850 grasslands? Justify your response, be specific and complete.View Full Posting Details