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Performance trade-off across a natural resource gradient.

Kristen H Desmarais1, Alan J Tessier1

  • 1W.K. Kellogg Biological Station and Department of Zoology, Michigan State University, 3700 E Gull Lake Dr., Hickory Corners, MI 49060, USA e-mail: tessier@kbs.msu.edu, Fax: +1-616-671-2104, , , , , , US.

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Summary
This summary is machine-generated.

Lake depth influences zooplankton communities. Daphnia species show an adaptive trade-off in exploiting resource quality, impacting their fitness in shallow versus deep lakes.

Keywords:
CeriodaphniaDaphniaKey words Growth rateLake depthResource quality

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Area of Science:

  • Aquatic ecology
  • Limnology
  • Zooplankton-phytoplankton interactions

Background:

  • Lake depth and thermal stratification are key drivers of phytoplankton and zooplankton community structure.
  • Limited understanding exists on how zooplankton-phytoplankton interactions vary with lake depth.

Purpose of the Study:

  • To investigate resource availability for daphniid zooplankton across a lake depth gradient.
  • To determine if resource quality drives species-specific performance trade-offs in daphniids.

Main Methods:

  • Utilized a novel growth bioassay to assess resource availability in shallow and deep lakes.
  • Conducted reciprocal transplant experiments with shallow-water (Ceriodaphnia reticulata) and deep-water (Daphnia dentifera) daphniids.
  • Manipulated resource quantity via dilution to differentiate between resource quantity and quality effects.

Main Results:

  • Deep, stratified lakes exhibited lower resource richness compared to shallow, unstratified lakes.
  • Daphnia dentifera showed higher fitness in poor resource conditions (deep lakes), while Ceriodaphnia reticulata excelled in richer conditions (shallow lakes).
  • The observed performance trade-off was linked to resource quality, not quantity.

Conclusions:

  • Daphniid species composition shifts along lake depth gradients are driven by adaptive trade-offs in resource quality exploitation.
  • Resource quality is a critical factor mediating zooplankton community structure in lakes of varying depths.