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Adaptive evolution of phytoplankton cell size.

Lin Jiang1, Oscar M E Schofield, Paul G Falkowski

  • 1Institute of Marine and Coastal Sciences, Rutgers University, New Brunswick, New Jersey 08901, USA. ljiang@marine.rutgers.edu

The American Naturalist
|October 15, 2005
PubMed
Summary

This study models plankton evolution, predicting phytoplankton will shrink to picoplankton size. Coevolution with zooplankton can destabilize nutrient cycles, unlike stable systems without evolution.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Oceanography

Background:

  • Plankton body size influences marine ecosystem dynamics and biogeochemical cycles.
  • Understanding evolutionary pressures on plankton size is crucial for predicting ecosystem responses.

Purpose of the Study:

  • To investigate adaptive changes in plankton body size using a nutrient-phytoplankton-zooplankton (NPZ) model.
  • To examine the effects of adaptive evolution and allometric relations on plankton size dynamics.

Main Methods:

  • Development of a simple nutrient-phytoplankton-zooplankton (NPZ) model.
  • Incorporation of adaptive evolution and allometric relationships into the model.
  • Simulation of plankton dynamics under stable environmental conditions.

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Main Results:

  • Phytoplankton are predicted to evolve towards smaller, picoplankton sizes.
  • Nutrient concentration is minimized when phytoplankton reach peak fitness without grazers.
  • Coevolution with zooplankton can increase phytoplankton size with nutrient flux and destabilize NPZ dynamics.

Conclusions:

  • Evolutionary interactions between phytoplankton and zooplankton can significantly alter plankton body size.
  • These evolutionary dynamics may explain observed changes in phytoplankton size and biogeochemical cycles over geological time.