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Environmental differences explain subtle yet detectable genetic structure in a widespread pollinator.

Marcel Glück1, Julia C Geue2, Henri A Thomassen3

  • 1Comparative Zoology, Institute of Evolution and Ecology, Tübingen University, Tübingen, Germany. marcel.glueck@uni-tuebingen.de.

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Summary
This summary is machine-generated.

Environmental factors, not just distance, drive genetic structure in buff-tailed bumble bees (Bombus terrestris). This study reveals subtle population differences, crucial for managing this important pollinator.

Keywords:
Bombus terrestrisBumblebeeEastern EuropeEnvironmental gradientsGeneralized dissimilarity modellingIsolation by environmentLandscape geneticsMicrosatellitesPopulation geneticsQuasi-panmixia

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Area of Science:

  • Ecology
  • Population Genetics
  • Conservation Biology

Background:

  • Environmental factors significantly influence genetic structure in natural populations.
  • Vagile species may exhibit subtle genetic structure, potentially leading to misclassification as quasi-panmictic and mismanagement.
  • The buff-tailed bumble bee (Bombus terrestris), an important pollinator, is often considered quasi-panmictic at continental scales.

Purpose of the Study:

  • Quantify the genetic structure of Bombus terrestris populations across two Eastern European countries.
  • Analyze the extent to which environmental differences, habitat permeability, and geographic distance explain observed genetic structure.
  • Investigate drivers of genetic divergence in a widespread, vagile insect species.

Main Methods:

  • Microsatellite genotyping across 21+ populations of Bombus terrestris.
  • Population genetic analyses including Fst, discriminant analysis of principal components (DAPC), and Bayesian clustering.
  • Generalized dissimilarity modeling to assess the influence of environmental, habitat, and geographic variables on genetic divergence.

Main Results:

  • Subtle genetic structure was detected in Bombus terrestris, exceeding Fst estimates but not significant in Bayesian clustering.
  • Geographic distance and habitat permeability did not significantly explain the spatial patterns of genetic divergence.
  • Environmental variables (temperature, vegetation, topography) were highly informative, explaining 33-39% of the observed genetic variation.

Conclusions:

  • Environmental heterogeneity, rather than dispersal limitations, is a key driver of subtle population structure in Bombus terrestris.
  • Environmental data are crucial for understanding population structure in vagile species previously considered quasi-panmictic.
  • Incorporating environmental data enhances the understanding of population structure and its drivers, improving management strategies for pollinators.