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Related Experiment Videos

Molecular area effects in Cepaea.

H Ochman1, J S Jones, R K Selander

  • 1Department of Biology, University of Rochester, Rochester, New York 14627.

Proceedings of the National Academy of Sciences of the United States of America
|July 1, 1983
PubMed
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Genetic patterns in land snails Cepaea nemoralis reveal distinct "molecular area effects" in the Pyrenees, suggesting past isolation and secondary contact shaped their current genetic structure, not climate or shell variations.

Area of Science:

  • Evolutionary Biology
  • Population Genetics
  • Malacology

Background:

  • Enzyme polymorphisms in Cepaea nemoralis exhibit strong geographic differentiation in the Pyrenees.
  • This genetic differentiation is not linked to shell color/banding patterns or major environmental gradients (climate, vegetation).

Purpose of the Study:

  • To investigate the geographic patterns of enzyme polymorphisms in Cepaea nemoralis populations.
  • To understand the evolutionary forces shaping the genetic structure of these land snail populations in the Pyrenees.

Main Methods:

  • Analysis of enzyme polymorphisms in Cepaea nemoralis populations across the central Pyrenees.
  • Geographic mapping of allele frequencies and comparison with environmental and morphological data.

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Main Results:

  • Identified three distinct regions of genetic uniformity separated by sharp clines in allele frequencies, termed "molecular area effects."
  • Observed concordant geographic patterns of genetic differentiation.
  • Found no correlation between genetic patterns and shell morphology or major climatic/vegetation variations.

Conclusions:

  • The observed genetic structure is best explained by a model of allopatric differentiation during Pleistocene glacial periods, followed by secondary contact and hybridization.
  • The genetic differentiation patterns are not explained by stasipatric or parapatric speciation models.