Why breeding earlier is always worthwhile

R. Sibly, P. Calow

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    50 Scopus citations

    Abstract

    Delayed reproduction is probably never advantageous (increases fitness) in constant conditions, unless trade-offs exist between the timing of reproduction and other fitness components. Fitness is here defined as rate of increase of a dominant allele which makes the animal breed earlier. Delayed reproduction could be advantageous if future offspring enjoyed better conditions than present offspring. In the absence of trade-offs it can be shown mathematically that delayed reproduction is never advantageous if any of the following conditions is true: (1) F > -μk, where F is fitness and μk is mortality rate at the time of the kth breeding attempt; (2) mortality rate is either constant, increases or declines with age provided two or more eggs/neonates are produced per breeding (one or more in asexual species) in the first two cases, and in the third case that breeding after age tk is regularly spaced; (3) semelparity applies, with more than two eggs/neonates produced at breeding; (4) a particular, but plausible iteroparous model applies. Some previous treatments of delayed reproduction are discussed.

    Original languageEnglish (US)
    Pages (from-to)311-319
    Number of pages9
    JournalJournal of Theoretical Biology
    Volume123
    Issue number3
    DOIs
    StatePublished - Dec 7 1986

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    Copyright:
    Copyright 2014 Elsevier B.V., All rights reserved.

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