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Characterizing scale-dependent community assembly using the functional-diversity--area relationship.

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  • 1Center for Conservation and Sustainable Development, Missouri Botanical Garden, P.O. Box 299, St. Louis, Missouri 63166, USA. adam.smith@mobot.org

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Functional diversity (FD) reveals community assembly processes like filtering and biotic sorting. The functional-diversity-area relationship (FAR) and null models help identify these processes across spatial scales.

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Area of Science:

  • Ecology
  • Community Ecology
  • Trait-based Ecology

Background:

  • Phenotypic traits mediate organism-environment interactions and influence community assembly.
  • Functional diversity (FD), the dispersion of trait values, provides insights into ecological processes.
  • Assembly processes like habitat filtering and biotic sorting are expected to vary with spatial scale.

Purpose of the Study:

  • Introduce the functional-diversity-area relationship (FAR) as a tool to study community assembly.
  • Develop null model tests to differentiate FARs driven by filtering versus biotic sorting.
  • Examine the scale dependence of community assembly processes.

Main Methods:

  • Developed the functional-diversity-area relationship (FAR) by plotting phenotypic trait diversity against spatial scale.
  • Created null model tests to distinguish between filtering and biotic sorting effects on FARs.
  • Applied FAR and null models to ecological examples to illustrate utility.

Main Results:

  • The FAR provides a framework analogous to the species-area relationship but for trait diversity.
  • Null model tests can identify the dominant assembly processes (filtering or sorting) and their scale dependence.
  • FAR analysis reveals how community assembly mechanisms operate differently across spatial scales.

Conclusions:

  • The FAR is a valuable tool for understanding the scale-dependent nature of community assembly.
  • Multi-scale analysis of FD relative to null expectations enhances ecological insights.
  • This approach aids in deciphering the interplay of filtering and biotic sorting in structuring ecological communities.