Results 31 to 40 of about 67,350 (184)
Sperm competition risk drives plasticity in seminal fluid composition [PDF]
, 2015 Background Ejaculates contain a diverse mixture of sperm and seminal fluid proteins, the combination of which is crucial to male reproductive success under competitive conditions.
Beynon, Rob +7 more
core +2 more sources
Sperm Viability Matters in Insect Sperm Competition [PDF]
Current Biology, 2005 Experimental studies in insects have shown how sperm competition can be a potent selective force acting on an array of male reproductive traits . However, the role of sperm quality in determining paternity in insects has been neglected, despite the fact that sperm quality has been shown to influence the outcome of sperm competition in vertebrates .
Garcı́a-González, Francisco +1 more
openaire +2 more sources
Variation in the post-mating fitness landscape in fruitflies [PDF]
, 2017 Sperm competition is pervasive and fundamental to determining a male’s overall fitness. Sperm traits and seminal fluid proteins (Sfps) are key factors. However, studies of sperm competition may often exclude females that fail to remate during a defined ...
Allen +52 more
core +1 more source
Seminal fluid affects sperm viability in a cricket.
PLoS ONE, 2011 Recent studies have suggested that males may vary the quality of their ejaculates in response to sperm competition, although the mechanisms by which they do so remain unclear.
Leigh W Simmons, Maxine Beveridge
doaj +1 more source
Experimental evolution of sperm competitiveness in a mammal
BMC Evolutionary Biology, 2011 Background When females mate with multiple partners, sperm from rival males compete to fertilise the ova. Studies of experimental evolution have proven the selective action of sperm competition on male reproductive traits.
Simmons Leigh W, Firman Renée C
doaj +1 more source
Sperm competition in bats [PDF]
Proceedings of the Royal Society of London. Series B: Biological Sciences, 1997 (Uploaded by Plazi for the Bat Literature Project) Sperm competition is a widespread phenomenon influencing the evolution of male anatomy, physiology and behaviour. Bats are an ideal group for studying sperm competition. Females store fertile sperm for up to 200 days and the size of social groups varies from single animals to groups of hundreds of ...
openaire +2 more sources
Sperm Viability and Sperm Competition in Insects [PDF]
Current Biology, 2002 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.
Hunter, F.M, Birkhead, T.R
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Performance of rodent spermatozoa over time is enhanced by increased ATP concentrations: The role of sperm competition [PDF]
, 2016 © 2015 by the Society for the Study of Reproduction, Inc. Sperm viability, acrosome integrity, motility, and swimming velocity are determinants of male fertility and exhibit an extreme degree of variation among closely related species.
Luque-Larena, Juan José +5 more
core +1 more source
Postcopulatory sexual selection is associated with reduced variation in sperm morphology. [PDF]
PLoS ONE, 2007 The evolutionary role of postcopulatory sexual selection in shaping male reproductive traits, including sperm morphology, is well documented in several taxa.
Sara Calhim +2 more
doaj +1 more source
Structural variation in Drosophila melanogaster spermathecal ducts and its association with sperm competition dynamics [PDF]
Royal Society Open Science, 2020 The ability of female insects to retain and use sperm for days, months, or even years after mating requires specialized storage organs in the reproductive tract.
Ben R. Hopkins +2 more
doaj +1 more source