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Related Experiment Videos

Consumer Versus Resource Control in Freshwater Pelagic Food Webs

Brett1, Goldman

  • 1Division of Environmental Studies, University of California, Davis, CA 95616, USA.

Science (New York, N.Y.)
|January 17, 1997
PubMed
Summary

Food web structure is influenced by consumers and resources. This meta-analysis found that while zooplankton biomass is consumer-controlled, phytoplankton biomass is resource-controlled, challenging some ecological theories.

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From Joseph Goldman, MPhil, MA.

MedGenMed : Medscape general medicine·2000

Area of Science:

  • Ecology
  • Aquatic Ecology
  • Food Web Dynamics

Background:

  • Food-web structure is theoretically regulated by consumer-resource interactions.
  • Trophic position and food-web length are hypothesized to influence the strength of these regulations.

Purpose of the Study:

  • To test theoretical predictions of food-web regulation using empirical data.
  • To investigate the roles of consumers and resources in plankton communities.

Main Methods:

  • A meta-analysis of 11 fish (consumer)-by-nutrient (resource) factorial plankton community experiments.
  • Statistical analysis of biomass responses in phytoplankton and zooplankton.

Main Results:

  • Zooplankton biomass showed strong consumer control and weak nutrient stimulation.
  • Phytoplankton biomass exhibited strong resource control and moderate fish (consumer) control.
  • Observed responses deviated from predictions based on food-web length and trophic levels.

Conclusions:

  • Consumer control is significant for zooplankton, while resource control dominates phytoplankton biomass.
  • Empirical data partially support but also challenge existing food-web theories regarding trophic levels.

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