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Related Experiment Videos

Phylogenetic balance and ecological evenness.

Campbell O Webb1, Nigel C A Pitman

  • 1Department of Ecology and Evolutionary Biology, Yale University, Box 208106, New Haven, Connecticut 06511, USA. campbell.webb@yale.edu

Systematic Biology
|January 30, 2003
PubMed
Summary

Species-rich families tend to contain more abundant species, but this trend disappears when using phylogenetic analyses with species as terminal taxa. Further research is needed to clarify abundance-diversity relationships.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Biodiversity Science

Background:

  • Species abundance distributions often mirror taxonomic diversity patterns, with few abundant species dominating communities.
  • Hypotheses suggest a link between a species' abundance and the diversity of its higher taxonomic group, but empirical evidence is inconsistent.
  • Traditional taxonomic classification may introduce subjectivity, potentially confounding the analysis of abundance-diversity relationships.

Purpose of the Study:

  • To investigate the relationship between clade diversity and mean species abundance in tropical tree communities.
  • To compare traditional rank-based analyses with novel phylogenetic methods for assessing abundance-diversity patterns.
  • To determine if taxonomic rank or phylogenetic relatedness better explains species abundance distributions.

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Main Methods:

  • Analyzed two diverse tropical tree communities.
  • Employed traditional rank-based taxonomic analysis.
  • Utilized two phylogenetic analyses, including node-based ratios of individuals to taxa and species as terminal taxa.

Main Results:

  • Rank-based and phylogenetic analyses using higher taxonomic ranks revealed that species-rich families harbor more common species.
  • Phylogenetic analyses treating individual species as terminal taxa did not find a significant relationship between clade diversity and species abundance.
  • The results suggest that the observed trend may depend on the analytical approach and taxonomic level used.

Conclusions:

  • The association between species abundance and higher taxon diversity is detectable using traditional and some phylogenetic methods but not when species are the primary phylogenetic units.
  • Potential reasons for discrepancies include the absence of a true phylogeny-wide effect, limitations in phylogenetic resolution, or insufficient sensitivity of analytical metrics.
  • Further development of phylogeny-based methods is crucial for robustly testing abundance-diversity relationships in ecological communities.