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The mid-domain effect revisited.

Fernando A Zapata1, Kevin J Gaston, Steven L Chown

  • 1Department of Biology, Universidad de Valle, Apartado Aéreo 25360, Cali, Colombia. fazapata@univalle.edu.co

The American Naturalist
|October 15, 2005
PubMed
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The mid-domain effect (MDE) hypothesis, which links range boundaries to species richness, lacks strong empirical support. Geometric constraints alone do not generally explain species richness gradients.

Area of Science:

  • Ecology
  • Biodiversity Science
  • Biogeography

Background:

  • The mid-domain effect (MDE) hypothesis proposes that range boundary constraints drive species richness gradients.
  • This study critically examines the core assumptions of MDE models, particularly regarding species range sizes in the absence of environmental gradients.

Discussion:

  • Significant debate persists concerning the precise definition of domain limits and appropriate methods for statistically testing MDE predictions.
  • Empirical evidence supporting the MDE is often weak and inconsistent, questioning its general applicability.

Key Insights:

  • Species' range sizes are not consistently retained as assumed by MDE models when environmental gradients are absent.
  • Geometric constraints on species ranges appear insufficient as a universal explanation for observed patterns of species richness.

Related Experiment Videos

Outlook:

  • Future ecological research should refine null model approaches for assessing biodiversity patterns.
  • Further investigation is needed to understand the interplay of factors contributing to species richness gradients beyond simple geometric constraints.