Results 71 to 80 of about 67,350 (184)
تاکسونومی و بیوسیستماتیک, 2013 In this research, the variation of spermatozoa traits among three male rainbow trout (Oncorhynchus mykiss) was used to examine how the relative influences of sperm density and duration of sperm motility account for sperm competition success.
Hossein Moradyan +3 more
doaj
COMP-1 promotes competitive advantage of nematode sperm
eLife, 2015 Competition among sperm to fertilize oocytes is a ubiquitous feature of sexual reproduction as well as a profoundly important aspect of sexual selection.
Jody M Hansen +2 more
doaj +1 more source
Sperm traits negatively covary with size and asymmetry of a secondary sexual trait in a freshwater crayfish. [PDF]
PLoS ONE, 2012 In species where females mate promiscuously, the reproductive success of males depends both on their ability to acquire mates (pre-copulatory sexual selection) and ability of their ejaculates to outcompete those of other males (post-copulatory sexual ...
Paolo Galeotti +5 more
doaj +1 more source
Sexual selection and the evolution of brain size in primates.
PLoS ONE, 2006 Reproductive competition among males has long been considered a powerful force in the evolution of primates. The evolution of brain size and complexity in the Order Primates has been widely regarded as the hallmark of primate evolutionary history ...
Michael A Schillaci
doaj +1 more source
Sperm Morphology in Neotropical Primates
Animals, 2019 The morphological and morphometric characterization of spermatozoa has been used as a taxonomic and phylogenetic tool for different species of mammals. We evaluated and compared the sperm morphometry of five neotropical primate species: Alouatta caraya ...
Eliana R. Steinberg +5 more
doaj +1 more source
Sperm storage by males causes changes in sperm phenotype and influences the reproductive fitness of males and their sons [PDF]
, 2017 Recent studies suggest that environmentally induced effects on sperm phenotype can influence offspring phenotype beyond the classic Mendelian inheritance mechanism.
Adriaenssens +54 more
core +1 more source
La compétition spermatique chez les insectes: les stratégies d'assurance de la paternité et la préséance du sperme [PDF]
Biotechnologie, Agronomie, Société et Environnement, 1999 Sperm competition in insects: paternity assurance and sperm precedence. The prediction that insects, as a result of polyandry, extreme sperm longevity within the female and high efficiency of sperm utilisation at fertilisation, are preadapted to sustain ...
Arnaud L.
doaj
Ejaculate allocation by male sand martins, Riparia riparia [PDF]
, 2001 Males of many species allocate sperm to ejaculates strategically in response to variation in the risk and intensity of sperm competition. The notable exception is passerine birds, in which evidence for strategic allocation is absent.
E. H. Nicholls +6 more
core +2 more sources
Heritable determinants of male fertilization success in the nematode [PDF]
, 2011 Background Sperm competition is a driving force in the evolution of male sperm characteristics in many species. In the nematode Caenorhabditis elegans, larger male sperm evolve under experimentally increased sperm competition and larger male sperm ...
Kozlowska Joanna L +2 more
core +1 more source
Sophisticated sperm allocation in male fowl [PDF]
, 2003 When a female is sexually promiscuous, the ejaculates of different males compete for the fertilization of her eggs; the more sperm a male inseminates into a female, the more likely he is to fertilize her eggs.
Pizzari, T. +4 more
core +1 more source