Sperm morphology and velocity are genetically codetermined in the zebra finch

Mossman, Jim and Slate, Jon and Humphries, Stuart and Birkhead, Tim (2009) Sperm morphology and velocity are genetically codetermined in the zebra finch. Evolution, 63 (10). pp. 2730-2737. ISSN 0014-3820

Full content URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1558-...

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Sperm morphology and velocity are genetically codetermined in the zebra finch

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Abstract

Sperm morphology (size and shape) and sperm velocity are both positively associated with fertilization success, and are expected to be under strong selection. Until recently, evidence for a link between sperm morphology and velocity was lacking, but recent comparative studies have shown that species with high levels of sperm competition have evolved long and fast sperm. It is therefore surprising that evidence for a phenotypic or genetic relationship between length and velocity within species is equivocal, even though sperm competition is played out in the intraspecific arena. Here, we first show that sperm velocity is positively phenotypically correlated with measures of sperm length in the zebra finch Taeniopygia guttata. Second, by using the quantitative genetic "animal model" on a dataset from a multigenerational- pedigreed population, we show that sperm velocity is heritable, and positively genetically correlated to a number of heritable components of sperm length. Therefore, selection for faster sperm will simultaneously lead to the evolution of longer sperm (and vice versa). Our results provide, for the first time, a clear phenotypic and genetic link between sperm length and velocity, which has broad implications for understanding how recently described macroevolutionary patterns in sperm traits have evolved.

Keywords:data set, evolutionary biology, heritability, life history trait, morphology, passerine, reproductive success, sexual selection, sperm competition, animal, article, finch, genetics, male, principal component analysis, spermatozoon, spermatozoon motility, Animals, Finches, Sperm Motility, Spermatozoa, Animalia, Taeniopygia guttata
Subjects:C Biological Sciences > C400 Genetics
C Biological Sciences > C182 Evolution
Divisions:College of Science > School of Life Sciences
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ID Code:15262
Deposited On:13 Oct 2014 09:16

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