The strength of selection in the context of migration speed

AI Houston

Research output: Contribution to journalArticle (Academic Journal)

18 Citations (Scopus)

Abstract

I use a model of avian migration based on maximization of overall migration speed to compare the strength of selection acting on foraging performance and flight speed. Let the optimal foraging behaviour be u* and the optimal flight speed be v*. It is shown that at this optimum, the ratio of the strength of selection on foraging to the strength of selection on flight speed is θ =–(u*2Pγ″/v*2γP″), where γ is the rate of energy expenditure during flight and P is the rate at which energy is gained during foraging. The dimensionless ratio P/γ is the ratio of time spent building up fuel to time spent flying which A. Hedenström and T. Alerstam showed was much greater than unity. Although θ depends on this ratio, it also depends on the curvatures of the functions, as represented by γ″ and P″. I use this simple example to make some general points about the strength of selection.
Translated title of the contributionThe strength of selection in the context of migration speed
Original languageEnglish
Pages (from-to)2393 - 2395
JournalProceedings of the Royal Society B: Biological Sciences
Volume267
Issue number1460
DOIs
Publication statusPublished - 2000

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