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Differing, multiscale landscape effects on genetic diversity and differentiation in eastern chipmunks.

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Habitat fragmentation impacts genetic variation differently across spatial scales. Matrix quality influences genetic differentiation, while configuration affects genetic diversity, highlighting the need for multiscale landscape genetics studies.

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Area of Science:

  • Landscape genetics
  • Conservation biology
  • Population genetics

Background:

  • Habitat loss and fragmentation are key drivers of genetic variation loss.
  • Previous studies often used single spatial scales, limiting understanding of landscape impacts.
  • Both genetic diversity and differentiation are crucial for predicting population persistence.

Purpose of the Study:

  • To investigate how landscape heterogeneity influences genetic diversity and differentiation.
  • To examine these influences at multiple spatial scales.
  • To assess the role of habitat amount, configuration, and matrix quality.

Main Methods:

  • Studied eastern chipmunks (Tamias striatus) across 31 independent landscapes.
  • Sampled genetic data at two distinct spatial scales.
  • Analyzed genetic diversity and differentiation in relation to landscape context.

Main Results:

  • Intervening matrix quality correlated with genetic differentiation across scales.
  • Landscape configuration was associated with regional genetic diversity.
  • Habitat amount did not significantly impact genetic diversity or differentiation.

Conclusions:

  • Landscape effects on genetic variation are scale-dependent and vary by genetic metric.
  • Replicated, multiscale studies are essential for robust landscape genetics research.
  • Findings underscore the complexity of predicting population persistence under fragmentation.