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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Design an Experiment Design an experiment to test the hypothesis that predators in an aquatic ecosystem regulate the ecosystem’s primary productivity. Establish as many experimental ponds as you wish, and imagine stocking them with organisms at different trophic levels. If the hypothesis is correct, describe the results you would expect to record from each of your experimental treatments.

Summary Introduction

To review:

An experiment to test that predators in an aquatic ecosystem regulate the ecosystem’s primary productivity.

Introduction:

Food web consists of trophic levels based on feeding habits of organisms. Primary producers are the first trophic level. Herbivores feed on primary producers and form the second level. Carnivores, feeding on herbivores, are the third trophic level. Detritivores and decomposers link all trophic levels. The interactions between the trophic levels that control the ecosystem are called a trophic cascade.

Explanation

The experiment is based on Silliman and Bertness experiments. It is conducted in three sets.

1. In one experiment, the effect of feeding by herbivores on the producers is measured. In three ponds, cordgrass was grown. In one pond, no snails were added, in second pond 600 snails were added, and in the third pond, 1200 snails were added.

2. In the second experiment, the effect of predators on snails was observed. In one pond, snails, crabs, and turtles were added, and in the second pond, no crabs and turtles added.

3. In the third experiment, snails were added to ponds with cordgrass and crabs were also added to measure the rate at which predators consume snails...

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