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Historical processes constrain patterns in global diatom diversity.

Wim Vyverman1, Elie Verleyen, Koen Sabbe

  • 1Ghent University, Biology Department, Protistology and Aquatic Ecology, Krijgslaan 281 S8, 9000 Gent, Belgium. Wim.vyverman@Ugent.be

Ecology
|September 11, 2007
PubMed
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Microbial dispersal is not unlimited. Freshwater diatoms show distinct latitudinal diversity gradients, influenced by regional isolation and habitat connectivity, challenging previous ecological assumptions.

Area of Science:

  • Ecology
  • Microbiology
  • Biogeography

Background:

  • Prevailing ecological theory suggests microbes possess unlimited dispersal, leading to ubiquity and absent latitudinal diversity gradients.
  • This study challenges the assumption of microbial ubiquity and unlimited dispersal capabilities.

Purpose of the Study:

  • To investigate the presence and nature of latitudinal diversity gradients in freshwater diatoms on a global scale.
  • To identify factors influencing local and regional diatom genus richness and geographic patterns.

Main Methods:

  • Analysis of a global freshwater diatom dataset.
  • Statistical modeling to assess the influence of isolation, habitat availability, connectivity, and historical factors on diatom richness.

Main Results:

Related Experiment Videos

  • Latitudinal gradients in local and regional diatom genus richness were identified and found to be asymmetric between hemispheres.
  • Regional richness patterns correlate with lake district isolation; local richness is constrained by regional species pools, habitat availability, and connectivity.
  • Historical factors significantly explained more geographic variation in genus richness than contemporary environmental conditions.

Conclusions:

  • Dispersal and migration are critical in structuring diatom communities across regional to global scales.
  • Findings support island biogeography and metacommunity theories, explaining provinciality and endemism, particularly in the Southern Hemisphere.