Sperm morphology and evidence for sperm competition among parrots
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چکیده
منابع مشابه
Sperm Viability and Sperm Competition in Insects
Sperm quality plays an important role in vertebrates in determining which male has the advantage when two or more males compete to fertilize a female's ova. In insects, however, the importance of sperm quality has never been considered, despite sperm competition being widespread and well studied in this group. We tested the hypothesis that sperm viability, measured as the proportion of live spe...
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We investigated how sperm morphology varies across 16 species of shorebirds in the Scolopacidae, Charadriidae, and Jacanidae. Sperm were significantly longer in nonmonogamous than in socially monogamous species. Nonmonogamous species also I Received 27 January 1999. Accepted 22 June 1999. 2Current address: Department of Zoology, Private Bag 4800, University of Canterbury, Christchurch, New Zeal...
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Sperm competition favors increases in relative testes mass and production efficiency, and changes in sperm phenotype that result in faster swimming speeds. However, little is known about its effects on traits that contribute to determine the quality of a whole ejaculate (i.e., proportion of motile, viable, morphologically normal and acrosome intact sperm) and that are key determinants of fertil...
متن کاملSperm competition
The existence and evolutionary significance of sexual selection through sperm competition was first realized by Geoff Parker in a prescient and influential review published in 1970. Parker recognized that competition between males for fertilizations will continue after mating, if the sperm of two or more males overlap near the site of fertilization in females. The process of sperm competition w...
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ژورنال
عنوان ژورنال: Journal of Evolutionary Biology
سال: 2019
ISSN: 1010-061X,1420-9101
DOI: 10.1111/jeb.13487