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Resurrection of Dormant Daphnia magna: Protocol and Applications
07:37

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Published on: January 19, 2018

Type III functional response in Daphnia.

Orlando Sarnelle1, Alan E Wilson

  • 1Department of Fisheries and Wildlife, Michigan State University, East Lansing, Michigan 48824, USA. sarnelle@msu.edu

Ecology
|July 1, 2008
PubMed
Summary
This summary is machine-generated.

Daphnia, a common lake herbivore, exhibits a Type III functional response at low food levels, indicating prey mortality may stabilize aquatic ecosystems. This feeding behavior is more common than previously thought.

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Area of Science:

  • Aquatic Ecology
  • Limnology
  • Zooplankton Ecology

Background:

  • Daphnia are key pelagic herbivores in freshwater lakes.
  • Understanding their functional response is crucial for aquatic ecosystem dynamics.
  • Previous studies often lacked data at very low food concentrations.

Purpose of the Study:

  • To assess the functional response of Daphnia at low food levels.
  • To determine if Daphnia exhibit a Type III functional response.
  • To investigate the implications for Daphnia-phytoplankton system stability.

Main Methods:

  • Secondary analysis of 28 published studies on Daphnia feeding.
  • Meta-analysis of Daphnia clearance rate versus food concentration.
  • Experimental feeding trials with Daphnia pulicaria and Ankistrodesmus falcatus at low food levels.

Main Results:

  • Literature analyses revealed a significant positive influence of food concentration on Daphnia clearance rate at low food levels, supporting a Type III response.
  • Meta-analysis confirmed a significantly positive slope across studies, further indicating a Type III functional response.
  • Experimental data showed clear evidence of a Type III functional response for Daphnia pulicaria.

Conclusions:

  • Daphnia exhibit a Type III functional response, particularly at low food concentrations near the population maintenance level (R*).
  • Type III responses in Daphnia may be more prevalent than previously recognized due to limited data at scarce food levels.
  • Reduced prey mortality at low phytoplankton densities could stabilize Daphnia-phytoplankton interactions in resource-limited systems.