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Extra-Mediterranean refugia: The rule and not the exception?

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Genetic data reveal that European species survived glacial periods in previously unknown refugia, challenging traditional biogeographical models. Many "Siberian" and Mediterranean species persisted in Central and Eastern Europe, not just the Mediterranean basin.

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Area of Science:

  • Biogeography
  • Evolutionary Biology
  • Genetics

Background:

  • Historically, European fauna was categorized into Mediterranean, Siberian, and Arctic/Alpine elements based on glacial survival.
  • Traditional views assumed limited glacial refugia, primarily in the Mediterranean and Eastern Palearctic.

Purpose of the Study:

  • To re-evaluate European biogeographical models using genetic data.
  • To identify previously unknown glacial refugia for various faunal elements.

Main Methods:

  • Genetic analyses of faunal populations across Europe.
  • Comparison of genetic data with established biogeographical distribution patterns.

Main Results:

  • Genetic analyses have uncovered numerous additional refugia for both continental and Mediterranean species.
  • Many species previously considered 'Siberian' likely survived glacial periods in southern Central and Eastern European refugia.
  • Mediterranean species have also been found to survive in cryptic northern refugia, such as the Carpathians and areas north of the Alps.

Conclusions:

  • Genetic evidence significantly modifies the traditional biogeographical understanding of Europe.
  • The survival of species in unexpected refugia highlights the complexity of postglacial recolonization patterns.
  • New refugia, particularly in Central and Eastern Europe, played a crucial role in the persistence of European fauna.