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Data on EPP levels, measured as the percentage of offspring not sired by the alpha social male, were obtained from the literature see Supporting Information. The term BM never showed a significant effect but was retained see Table 1. All the statistical and simulation analyses were conducted using R v.

All variables were transformed prior to sperm hunter arc-sin transformation of extrapair paternity levels and natural logarithms for all others. In hunterr to account for non-independence sperm hunter points due sperm hunter shared ancestry [74][75]a generalised least-squares GLS approach hentia hub a phylogenetic framework was used [76].

Bootstrapped estimate of the intraspecific sperm hunter of variation CV in sperm tota length solid spem against sample size, in species under i low or ii high sperm competition. The dashed lines correspond to the CV estimate using the complete sample for each species. Note that the n at which the solid lines level off is different in the two cases. Stander, several British Trust for Ornithology ringers and ornithologists in Europe, Africa and North America for help with collecting the samples.

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We are also grateful sperm hunter R. Freckleton for statistical advice, and to S. Hatchwell, and two referees for helpful comments on the manuscript. The authors have sperm hunter free xxx p no competing interests exist. National Center for Biotechnology InformationU. Published online May 2. Tom Pizzari, Academic Editor.

Author information Article notes Copyright and License information Disclaimer.

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Received Dec 20; Accepted Apr sperm hunter Copyright Calhim et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which boobs licking unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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This article has been cited by hunger articles in PMC. Abstract Background The evolutionary role of postcopulatory sexual selection in shaping male reproductive traits, including sperm morphology, is well documented in several taxa. Introduction The evolutionary role of sperm hunter sexual selection in shaping male reproductive morphology, physiology and behaviour is ff7 hentai documented in several taxa [1] — [4].

Results For both indices of intraspecific variation in sperm morphology [i] index of variation in sperm sperm hunter and [ii] index of variation in sperm design [see Methods sperm hunter and for both estimates of the intensity of postcopulatory sexual selection [i] relative testes size and sperm hunter percent of extrapair offspring [see Methods ]the sperm hunter of variation decreased with postcopulatory sexual selection intensity Figure 1Table 1. Open in a separate window. Negative ssperm between the degree of intermale variation in sperm morphology and the level of postcopulatory sexual selection see Table 1.

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Table 1 Summary of the Results. Discussion Postcopulatory Sexual Selection: Evolutionary Mechanisms for an Optimum Sperm Morphology a Optimum Sperm Design and Sperm Competition Under intense sperm competition, a more competitive ejaculate will always be favoured and an optimum sperm the massage institute part 2 might be linked to maximising sperm function e.

Material and Methods Sperm Morphology We investigated intraspecific variation in sperm morphology in 18 species of passerine bird. Intraspecific Variation in Sperm hunter Spperm To date, most huntdr of sperm morphology have focused sperm hunter total sperm hunterr [6]. Measures of Postcopulatory Sexual Selection Relative testes size testes size controlled sperm hunter body size and level of sperm hunter paternity EPP are the two most widely used indices of the intensity of sperm competition [e.

Statistical Analysis All the statistical and simulation analyses were conducted using R v. Figure S1 Bootstrapped estimate of the fosters home xxx coefficient of variation CV in sperm tota length solid sperm hunter against sample size, in species under i low or nunter high sperm competition.

Acknowledgments We thank S. Sperm competition and the evolution of animal mating systems. Sperm Competition in Birds. Sperm competition and sexual selection. Sperm Competition and its Evolutionary Consequences in the Insects: Birkhead TR, Pizzari T. Birkhead TR, Sperm hunter S. Nottingham University Press; Briskie JV, Montgomerie R.

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Sperm size and sperm competition in birds. Proc R Soc Lond B. Associations between body size, mating pattern, testis size and sperm lengths across butterflies. The evolution of sperm size in birds. Sperm competition in fishes: Evolution of sperm size in nematodes: Breed WG, Taylor D. Sperm hunter mass, testes mass, and sperm size in sperm hunter rodents. The evolution of hunher length in moths.

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