Sperm Competition and Sexual Selection by Tim R. Birkhead, Anders Pape Møller

By Tim R. Birkhead, Anders Pape Møller

Must-read e-book for any critical scholar or researcher who's drawn to the most recent techniques within the topic of sexual choice.

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Suppose that on average, Nn males are present in high competition, and NL males in low competition. Half the spawns occur in each state, and s~ and S*L are the ESS sperm allocations for the two states. The ratio of sperm in the two states is s+=s (,,) If NH and NL are quite large, this ratio approximates to NLINH: counterintuitively, more sperm should be released when there are fewer than average competitors, and less sperm when there are more than average competitors. Although it can apply for a wider range, this conclusion was found always to hold if the difference between each condition (NL, NH) and the mean (N) is less than the mean, and if the mean number of competitors exceeds two.

1990) from competing ejaculates will depend on the timing of copulations and fertilization events. Imagine two passive loss processes" (i) during movement of sperm from the site of insemination to the fertilization set (which we shall assume to be the sperm store), involving random loss at rate ka; and (ii) during storage in the sperm store, at rate kb. Suppose that there is competition between the ejaculates of two males, mating at a time delay, d, apart. Let the average time to reach the sperm store - ta, and let fertilization occur at time T after the first copulation (T > ta).

Parker Population Biology Research Group, School of Biological Sciences, Nicholson Building, University of Liverpool, Liverpool L69 3BX, UK Introduction . . . . . . . . . . . . . . . . . . . . . . . The logic of sperm competition games . . . . . . . . . . . . . II. III. Sperm competition and ejaculate expenditure across species: a fair raffle with no information . . . . . . . . . . . . . . . . . . IV. How should information or phenotypic state influence a male's sperm allocation?

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