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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Using Gamma Irradiation to Predict Sperm Competition Mechanism in Bagrada hilaris (Burmeister) (Hemiptera: Pentatomidae): Insights for a Future Management Strategy. [PDF]
Insects, 2023 The stink bug, Bagrada hilaris, is a pest of mainly Brassicaceae crops. It is native to Africa and Asia and was recently reported as invasive in the southwestern part of the USA and in South America.
Mainardi CE +7 more
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Within-ejaculate sperm competition. [PDF]
Philos Trans R Soc Lond B Biol Sci, 2020 Sperm competition was defined by Geoff Parker 50 years ago as the competition between sperm from two or more males over the fertilization of a set of eggs. Since the publication of his seminal paper, sperm competition has developed into a large field of research, and many aspects are still being discovered.
Sutter A, Immler S.
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Genetic Factors Influencing Sperm Competition. [PDF]
Front Genet, 2019 Females of many different species often mate with multiple males, creating opportunities for competition among their sperm. Although originally unappreciated, sperm competition is now considered a central form of post-copulatory male–male competition ...
Civetta A, Ranz JM.
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Variation in Eusperm Length May Reflect Reproductive Barriers and Differences in Sperm Competition Intensity Among <i>Littorina</i> Snails. [PDF]
Ecol EvolReproductive barriers limit gene flow and drive population divergence. Sperm morphology plays an important role in reproductive barriers, as successful fertilization depends on how well sperm perform in the female environment.
Kumpitsch L +3 more
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Sperm competition, sperm numbers and sperm quality in muroid rodents. [PDF]
PLoS ONE, 2011 Sperm competition favors increases in relative testes mass and production efficiency, and changes in sperm phenotype that result in faster swimming speeds. However, little is known about its effects on traits that contribute to determine the quality of a
Laura Gómez Montoto +7 more
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Male diet affects female fitness and sperm competition in human- and bat-associated lineages of the common bedbug, Cimex lectularius. [PDF]
Sci Rep, 2021 Sperm performance can vary in ecologically divergent populations, but it is often not clear whether the environment per se or genomic differences arising from divergent selection cause the difference.
Křemenová J +7 more
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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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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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