Metabolic rate limits the effect of sperm competition on mammalian spermatogenesis. [PDF]
PLoS ONE, 2013 Sperm competition leads to increased sperm production in many taxa. This response may result from increases in testes size, changes in testicular architecture or changes in the kinetics of spermatogenesis, but the impact of each one of these processes on
Javier delBarco-Trillo +2 more
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Sperm competition and the evolution of sperm design in mammals [PDF]
BMC Evolutionary Biology, 2011 Background The influence of sperm competition upon sperm size has been a controversial issue during the last 20 years which remains unresolved for mammals.
Gomendio Montserrat +2 more
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By hook or by crook? Morphometry, competition and cooperation in rodent sperm. [PDF]
PLoS ONE, 2007 BACKGROUND: Sperm design varies enormously across species and sperm competition is thought to be a major factor influencing this variation. However, the functional significance of many sperm traits is still poorly understood.
Simone Immler +3 more
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Psychological and physiological adaptations to sperm competition in humans [PDF]
, 2005 Postcopulatory competition between males, in the form of sperm competition, is a widespread phenomenon in many animal species. The extent to which sperm competition has been an important selective pressure during human evolution remains controversial ...
Goetz, AT, Pound, N, Shackelford, TK
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Sperm competition selects for sperm quantity and quality in the Australian Maluridae.
PLoS ONE, 2011 When ejaculates from rival males compete for fertilization, there is strong selection for sperm traits that enhance fertilization success. Sperm quantity is one such trait, and numerous studies have demonstrated a positive association between sperm ...
Melissah Rowe, Stephen Pruett-Jones
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The evolution of sperm morphometry in pheasants [PDF]
, 2007 Postcopulatory sexual selection is thought to be a potent evolutionary force driving the diversification of sperm shape and function across species. In birds, insemination and fertilisation are separated in time and sperm storage increases the duration
Birkhead, T.R. +5 more
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Biology Open, 2015 Sperm competition is a prevalent phenomenon that drives the evolution of sperm function. High levels of sperm competition lead to increased metabolism to fuel higher sperm velocities.
Javier delBarco-Trillo +2 more
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Variation in apical hook length reflects the intensity of sperm competition in murine rodents. [PDF]
PLoS ONE, 2013 BackgroundPost-copulatory sexual selection has been shown to shape morphology of male gametes. Both directional and stabilizing selection on sperm phenotype have been documented in vertebrates in response to sexual promiscuity.MethodologyHere we ...
Martin Šandera +2 more
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Co-evolution of male and female reproductive traits across the Bruchidae (Coleoptera) [PDF]
, 2008 1. Despite the obvious importance of spermatozoa to individual reproductive success a general explanation of variation in spermatozoan form and function is still lacking. In species with internal fertilization, sperm not only have to interact with the
Andrés +57 more
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Experimental evolution reveals that sperm competition intensity selects for longer, more costly sperm [PDF]
, 2017 It is the differences between sperm and eggs that fundamentally underpin the differences between the sexes within reproduction. For males, it is theorized that widespread sperm competition leads to selection for investment in sperm numbers, achieved by ...
Godwin, Joanne L. +6 more
core +4 more sources