Human Sperm Competition: A Comparative Evolutionary Analysis [PDF]
Animal Behavior and Cognition, 2014 Sperm competition occurs when a female copulates with two or more males within a sufficiently brief time period, resulting in sperm of the different males competing to fertilize ova.
Michael N. Pham, Todd K. Shackelford
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Audience effects in the Atlantic molly (
Frontiers in Zoology, 2009 Background Multidirectional interactions in social networks can have a profound effect on mate choice behavior; e.g., Poecilia mexicana males show weaker expression of mating preferences when being observed by a rival. This may be an adaptation to reduce
Kronmarck Claudia +6 more
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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
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Postcopulatory sexual selection results in spermatozoa with more uniform head and flagellum sizes in rodents. [PDF]
PLoS ONE, 2014 Interspecific comparative studies have shown that, in most taxa, postcopulatory sexual selection (PCSS) in the form of sperm competition drives the evolution of longer and faster swimming sperm.
María Varea-Sánchez +3 more
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Sperm competition in humans: mate guarding behavior negatively correlates with ejaculate quality. [PDF]
PLoS ONE, 2014 In species where females mate with multiple males, the sperm from these males must compete to fertilise available ova. Sexual selection from sperm competition is expected to favor opposing adaptations in males that function either in the avoidance of ...
Samantha Leivers +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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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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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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Sperm competition risk drives rapid ejaculate adjustments mediated by seminal fluid
eLife, 2017 In many species, males can make rapid adjustments to ejaculate performance in response to sperm competition risk; however, the mechanisms behind these changes are not understood.
Michael J Bartlett +3 more
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