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Phenotypic covariance at species' borders.

M Julian Caley1, Edward Cripps, Edward T Game

  • 1Australian Institute of Marine Science, PMB # 3, Townsville MC, Queensland QLD 4810, Australia. j.caley@aims.gov.au

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Phenotypic covariance differs significantly at species range edges, suggesting evolutionary change rather than constraint. These findings are crucial for understanding species evolution and conservation biology.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Conservation Biology

Background:

  • Understanding species limits is vital for ecology, evolution, and conservation.
  • Phenotypic covariance in marginal populations is understudied regarding its role in evolutionary responses to selection.
  • Coral reef fish species' borders were examined to understand trait correlations.

Purpose of the Study:

  • To investigate phenotypic covariance in morphological traits at species' borders.
  • To compare phenotypic covariance matrices (P) between central and marginal populations.
  • To assess whether covariance constrains or facilitates evolutionary responses.

Main Methods:

  • Compared phenotypic covariance matrices (P) in central versus marginal populations of three coral reef fish species-pairs.
  • Analyzed shared structure, correlation strengths, morphological integration, and matrix ranks.
  • Examined pair-wise trait correlations within populations.

Main Results:

  • Greater structural differences in phenotypic covariance matrices (P) were found between marginal and central populations than between two central populations.
  • Approximately 80% of pair-wise trait correlations were stronger in northern populations.
  • These correlation differences were independent of population position within the geographic range.

Conclusions:

  • Morphological integration and matrix ranks did not indicate greater evolutionary constraint at species' range edges.
  • Observed covariance characteristics suggest structural changes due to selection or drift, not constraint, at range borders.
  • These findings highlight the potential for future evolution at species' geographic limits.