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Related Experiment Videos

Evaluation of selection on cliff swallows.

T D Price1, C R Brown, M B Brown

  • 1Department of Biology 0116, University of California at San Diego, La Jolla 92093, USA. tprice@ucsd.edu

Evolution; International Journal of Organic Evolution
|December 7, 2000
PubMed
Summary

Estimating selection intensity in cliff swallows proved challenging due to an unknown death rate. While selection appears strong, its exact magnitude remains uncertain, possibly due to sampling biases.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Population Genetics

Background:

  • Estimating selection intensity requires knowing the proportion of a population that dies.
  • Previous methods were limited when the death rate was unknown.

Purpose of the Study:

  • To estimate selection intensity in a cliff swallow population using novel methods.
  • To address challenges posed by an unknown and potentially high mortality rate.

Main Methods:

  • Application of recently developed methods (Blanckenhorn et al. 1999) for selection intensity estimation.
  • Analysis of data from living and dead cliff swallows.

Main Results:

  • Inferred selection intensity was very strong, exceeding levels expected for a normal distribution.

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  • The fraction of the original population dying was unknown but presumed high.

    • Conclusions:

    • Strong selection was likely present in the cliff swallow population.
    • Absolute selection intensity could not be definitively determined, with sampling biases being a probable cause for the extreme estimate.