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Scale decisions can reverse conclusions on community assembly processes.

Tamara Münkemüller1, Laure Gallien1, Sébastien Lavergne1

  • 1Laboratoire d'Ecologie Alpine, UMR CNRS 5553, University Joseph Fourier, Grenoble 1, BP 53, 38041 Grenoble Cedex 9, France.

Global Ecology and Biogeography : a Journal of Macroecology
|May 3, 2014
PubMed
Summary
This summary is machine-generated.

Scale choices significantly impact phylogenetic diversity patterns in community assembly. Organismic scale effects were stronger than spatial or environmental extent, highlighting the need to test scale robustness for local community assembly rules.

Keywords:
Alpha diversityassembly rulescommunity ecologyecophylogeneticsnull modelssampling design

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Phylogenetics

Background:

  • Phylogenetic diversity patterns are key to understanding community assembly.
  • Ecological and evolutionary processes shape biodiversity.
  • Scale influences ecological pattern detection.

Purpose of the Study:

  • Quantify the impact of spatial, environmental, and organismic scales on phylogenetic diversity patterns.
  • Investigate how scale choices affect inferences of community assembly rules.
  • Assess the robustness of phylogenetic diversity analyses to scale variations.

Main Methods:

  • Applied 42 sampling strategies with varying focal scales in the European Alps.
  • Estimated phylogenetic diversity (species pools, local communities) and non-random diversity statistics.
  • Used regression analyses to study the effects of scale choices on diversity measures.

Main Results:

  • Scale choices critically influenced diversity pattern detection, sometimes reversing clustering/over-dispersion signals.
  • Organismic scale had a greater impact than spatial or environmental extent.
  • Scale effects were minimal for regional patterns along abiotic gradients.

Conclusions:

  • Caution is advised when combining phylogenetic and distributional data for community assembly studies.
  • Analyses relating community diversity to abiotic gradients are robust to scale.
  • For local community assembly rules, scale choice uncertainty necessitates testing pattern robustness.