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Related Experiment Video

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Determination of Total Lipid and Lipid Classes in Marine Samples
14:59

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Published on: December 11, 2021

Food chains in freshwaters.

John L Sabo1, Jacques C Finlay, David M Post

  • 1School of Life Sciences, Arizona State University, Tempe, Arizona 85287-4501, USA. John.L.Sabo@asu.edu

Annals of the New York Academy of Sciences
|May 13, 2009
PubMed
Summary
This summary is machine-generated.

This study evaluates controls on freshwater food-chain length (FCL), finding few studies use consistent methods. It suggests rules for future research on FCL and its ecological impacts.

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Area of Science:

  • Ecology
  • Freshwater Biology
  • Food Web Dynamics

Background:

  • Food-chain length (FCL) is hypothesized to be controlled by energy supply, ecosystem size, and environmental variation.
  • Understanding FCL is crucial for predicting contaminant bioaccumulation and biocontrol efficacy.

Purpose of the Study:

  • To evaluate evidence for controls on FCL in diverse freshwater ecosystems.
  • To define and compare different methods for measuring FCL.
  • To propose guidelines for future FCL research.

Main Methods:

  • Systematic review of studies on FCL in streams, lakes, ponds, and wetlands.
  • Analysis of evidence linking energy availability, ecosystem size, and environmental variation to FCL.
  • Definition of connectance-based, functional, and realized FCL measures.

Main Results:

  • A surprising lack of studies employ consistent methodologies to test FCL controls across freshwater systems.
  • Compelling, yet varied, results emerge from studies using functional, realized, and connectance-based FCL measures.
  • Identified potential relationships between climate change, hydrology, and freshwater FCL.

Conclusions:

  • Standardized methods are needed to synthesize FCL research across freshwater ecosystems.
  • Established rules of thumb can improve future study comparability.
  • FCL significantly influences contaminant concentrations and biocontrol effectiveness.