Male sperm expenditure under sperm competition risk and intensity in quacking frogs
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چکیده
منابع مشابه
Sequential male mate choice under sperm competition risk
Male eagerness to mate is a central paradigm of sexual selection theory. However, limited sperm supplies mean that male sexual restraint might sometimes be favored under promiscuous mating. Here, we demonstrate dynamic plasticity in male mating effort when females are encountered sequentially under varying sperm competition risk. Rather than showing consistent eagerness to mate, male house mice...
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Female sexual promiscuity can have significant effects on male mating decisions because it increases the intensity of competition between ejaculates for fertilization. Because sperm production is costly, males that can detect multiple matings by females and allocate sperm strategically will have an obvious fitness advantage. The presence of rival males is widely recognized as a cue used by male...
متن کاملMale crickets adjust ejaculate quality with both risk and intensity of sperm competition.
Sperm competition theory predicts that males should increase their expenditure on the ejaculate with increasing risk of sperm competition, but decrease their expenditure with increasing intensity. There is accumulating evidence for sperm competition theory, based on examinations of testes size and/or the numbers of sperm ejaculated. However, recent studies suggest that ejaculate quality can als...
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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...
متن کاملSperm Competition and Sperm Length in Shorebirds ’
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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ژورنال
عنوان ژورنال: Behavioral Ecology
سال: 2004
ISSN: 1465-7279,1045-2249
DOI: 10.1093/beheco/arh098