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Neutral Theory and Plankton Biodiversity.

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  • 1Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon, USA; email: mjb@science.oregonstate.edu, bissonk@oregonstate.edu.

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Neutral theory, focusing on random ecological events, offers a new lens for understanding phytoplankton biodiversity. This approach explains coexistence beyond traditional competition models, especially for distantly spaced plankton.

Keywords:
community structuringcompetitive exclusionneutral theorynichesphytoplankton biodiversitytrophic exclusion

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Area of Science:

  • Aquatic Ecology
  • Theoretical Ecology
  • Plankton Dynamics

Background:

  • Phytoplankton biodiversity has been primarily explained by competition, but spatial separation limits direct competitive interactions.
  • Neutral theory, emphasizing random ecological processes, is underutilized in aquatic ecology despite its terrestrial applications.

Purpose of the Study:

  • To review neutral theory's core concepts and assess its applicability to phytoplankton diversity.
  • To propose a theoretical framework integrating neutral theory with ecological niches and trophic exclusion.

Main Methods:

  • Literature review of neutral theory and its application in ecology.
  • Development of a theoretical model combining neutral theory with a nonneutral trophic exclusion principle.
  • Conceptual analysis of phytoplankton coexistence mechanisms.

Main Results:

  • Spatial distancing in phytoplankton populations reduces the impact of resource competition.
  • A proposed framework allows coexistence of all phytoplankton size classes across resource levels.
  • The model predicts intermediate diversity levels, higher than niche-based models but lower than pure neutral theory.

Conclusions:

  • Neutral theory provides a valuable, underused framework for understanding aquatic biodiversity.
  • The integrated model offers a more nuanced explanation for phytoplankton diversity patterns.
  • This perspective is particularly relevant for sparsely distributed planktonic organisms.