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Related Experiment Video

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Inferring microevolution from museum collections and resampling: lessons learned from Cepaea.

Małgorzata Ożgo1, Thor-Seng Liew2,3,4, Nicole B Webster3,4

  • 1Department of Evolutionary Biology, Kazimierz Wielki University, Bydgoszcz, Poland.

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|November 3, 2017
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Summary

Natural history collections reveal evolutionary shifts in Cepaea nemoralis snail populations. Changes towards lighter shells align with climate change predictions, highlighting short-term population dynamics.

Keywords:
Colour polymorphismEvolutionary trendsHIRECNatural history collectionsNatural selectionPopulation geneticsSnailsTime series

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Area of Science:

  • Evolutionary biology
  • Ecology
  • Museum studies

Background:

  • Natural history collections offer valuable long-term data on wild populations.
  • Cepaea nemoralis snail polymorphism is well-understood and influenced by environmental factors.
  • Geo-referenced historical samples provide a basis for studying evolutionary changes over time.

Purpose of the Study:

  • To investigate evolutionary changes in Cepaea nemoralis populations using historical museum samples.
  • To assess the impact of environmental changes on shell color and banding patterns in snail populations.
  • To evaluate the utility of natural history collections for tracking evolutionary responses.

Main Methods:

  • Utilized three geo-referenced sample sets of Cepaea nemoralis from Naturalis Biodiversity Center.
  • Conducted resampling of historical populations to analyze changes over 95, 69, and 50 years.
  • Analyzed shell color and banding morph frequencies to detect shifts in population genetics.

Main Results:

  • Two sites showed a trend towards lighter shells (yellow, less banded), consistent with climatic change.
  • One site exhibited no directional evolutionary change.
  • Significant year-to-year shifts in morph frequencies were observed, often exceeding long-term trends.

Conclusions:

  • Natural history collections are crucial for understanding evolutionary responses to environmental change.
  • Short-term population fluctuations can be more pronounced than long-term evolutionary trends.
  • Routine collection of large samples from common species is essential for robust evolutionary studies.