Disruptive selection and the genetic basis of bill size polymorphism in the African finch Pyrenestes
Article Abstract:
Bill size in the African finch Pyrenestes seems to vary according to a single genetic factor, and to be influenced by disruptive selection. Pyrenestes is the only bird known to have differing bill sizes not determined by sex. Bill size determines the variety and hardness of sedge seed the birds can most efficiently eat, from 13 Newtons of hardness for the small size to 299 N for the 'megabilled' finch. Birds of different bill sizes sometimes mate together.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Density cycles and offspring quantity and quality game driven by natural selection
Article Abstract:
An example of a genetic rate of increase versus carrying capacity selection, promoting stable population cycles in lizards, is presented.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
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Natural selection and sympatric divergence in the apple maggot Rhagoletis pomenella
Article Abstract:
The apple maggot Rhagoletis pomonella was studied for natural selection and sympatric divergence.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
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