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Stream insect occupancy-frequency patterns and metapopulation structure.

T Heatherly1, M R Whiles, D J Gibson

  • 1Department of Zoology and Center for Ecology, Southern Illinois University, Carbondale, IL 62901-6501, USA. heatherly75@yahoo.com

Oecologia
|November 9, 2006
PubMed
Summary
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Stream insect communities are dominated by satellite species, with their proportion increasing with spatial scale and sampling intensity. Niche-based models better explain these occupancy-frequency patterns than core-satellite hypotheses.

Area of Science:

  • Ecology
  • Biodiversity patterns
  • Biogeography

Background:

  • Understanding organism distribution is key in ecology.
  • Occupancy-frequency patterns visualize species distributions.
  • Core-satellite species hypothesis is a common model.

Purpose of the Study:

  • Analyze stream insect occupancy-frequency patterns.
  • Assess effects of spatial scale, sampling intensity, and taxonomic resolution.
  • Compare niche-based models with metapopulation models.

Main Methods:

  • Utilized North American stream insect distribution data.
  • Analyzed occupancy-frequency patterns across varying scales.
  • Examined taxonomic resolution effects using New York data.

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Main Results:

  • Distributions were dominated by satellite taxa (<10% sites).
  • Satellite taxa proportions increased with spatial scale and sampling intensity (r2=0.74-0.96).
  • Generic-level taxonomy underestimated satellite species and altered distribution modality.

Conclusions:

  • Stream insect communities consistently feature satellite species.
  • Satellite species proportion is influenced by spatial scale and sampling intensity.
  • Niche-based models provide a more accurate characterization than core-satellite models.