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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Functional relevance of the newly evolved sperm dynein intermediate chain multigene family in Drosophila melanogaster males. [PDF]
, 2012 In many animal species, traits associated with male fitness evolve rapidly. Intersexual conflict and male-male competition have been suggested to drive this rapid evolution.
Abbassi, Mashya +3 more
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Postcopulary sexual selection increases ATP content in rodent spermatozoa [PDF]
, 2016 Sperm competition often leads to increase in sperm numbers and sperm quality, and its effects on sperm function are now beginning to emerge. Rapid swimming speeds are crucial for mammalian spermatozoa, because they need to overcome physical barriers in ...
Gomendio, Montserrat +5 more
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Testes mass, but not sperm length, increases with higher levels of polyandry in an ancient sex model. [PDF]
PLoS ONE, 2014 There is strong evidence that polyandrous taxa have evolved relatively larger testes than monogamous relatives. Sperm size may either increase or decrease across species with the risk or intensity of sperm competition.
David E Vrech +3 more
doaj +1 more source
Do Men Produce Higher Quality Ejaculates When Primed With Thoughts of Partner Infidelity?
Evolutionary Psychology, 2018 Sperm competition theory can be used to generate the hypothesis that men alter the quality of their ejaculates as a function of sperm competition risk.
Michael N. Pham +10 more
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Sperm mobility: mechanisms of fertilizing efficiency, genetic variation and phenotypic relationship with male status in the domestic fowl, Gallus gallus domesticus [PDF]
, 2002 When females are sexually promiscuous, sexual selection continues after insemination through sperm competition and cryptic female choice, and male traits conveying an advantage in competitive fertilization are selected for. Although individual male and
Allen J Feltmann +6 more
core +2 more sources
Why small males have big sperm: dimorphic squid sperm linked to alternative mating behaviours
BMC Evolutionary Biology, 2011 Background Sperm cells are the target of strong sexual selection that may drive changes in sperm structure and function to maximize fertilisation success. Sperm evolution is regarded to be one of the major consequences of sperm competition in polyandrous
Shiba Kogiku +5 more
doaj +1 more source
Long sperm fertilize more eggs in a bird [PDF]
, 2015 Sperm competition, in which the ejaculates of multiple males compete to fertilize a female's ova, results in strong selection on sperm traits. Although sperm size and swimming velocity are known to independently affect fertilization success in certain ...
Bennison, C. +3 more
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Media Peternakan, 2013 The objective of this study was to examine the relationship between sperm morphometry and sperm competition in local goats. Forty bucks were used in this study, consisted of 4 breeds namely Ettawa Grade Goat (EGG), Kejobong Goat (KJG), Kacang Goat (KCG),
S. B. Wibowo +2 more
doaj +1 more source
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