Results 21 to 30 of about 67,350 (184)
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
doaj +1 more source
Cells, 2021 Mammals exhibit a tremendous amount of variation in sperm morphology and despite the acknowledgement of sperm structural diversity across taxa, its functional significance remains poorly understood. Of particular interest is the sperm of rodents.
Kristin A. Hook +2 more
doaj +1 more source
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
core +1 more source
Sperm death and dumping in Drosophila [PDF]
, 2004 Mating with more than one male is the norm for females of many species. In addition to generating competition between the ejaculates of different males, multiple mating may allow females to bias sperm use.
A Civetta +29 more
core +1 more source
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
doaj +1 more source
Effect of inbreeding and heritability of sperm competition success in the bulb mite Rhizoglyphus robini [PDF]
, 2005 Sperm competition is a potent evolutionary force shaping the reproductive biology of most animal species. Here, we estimated the heritability of sperm competition success in the promiscuous bulb mite Rhizoglyphus robini.
Keller, L., Konior, M., Radwan, J.
core +1 more source
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
core +1 more source
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