Results 91 to 100 of about 67,350 (184)

Effect of competitive cues on reproductive morphology and behavioral plasticity in male fruitflies [PDF]

, 2015
Phenotypic plasticity will be favored whenever there are significant fitness benefits of responding to environmental variation. The extent and nature of the plasticity that evolves depends on the rate of environmental fluctuations and the capacity to ...
Bretman, Amanda, Chapman, Tracey, Fricke, Claudia, Westmancoat, James   +3 more
core   +1 more source

Is sperm morphology functionally related to sperm swimming ability? A case study in a wild passerine bird with male hierarchies

BMC Evolutionary Biology, 2018
Background Sexual selection continues after copulation via either sperm competition or cryptic female choice, and favors sperm traits that maximize sperm competitiveness.
Alfonso Rojas Mora, Magali Meniri, Sabrina Ciprietti, Fabrice Helfenstein   +3 more
doaj   +1 more source

Cryptic female choice favours sperm from major histocompatibility complex-dissimilar males [PDF]

, 2013
Cryptic female choice may enable polyandrous females to avoid inbreeding or bias offspring variability at key loci after mating. However, the role of these genetic benefits in cryptic female choice remains poorly understood. Female red junglefowl, Gallus
Alcaide M, Bakst MR, Burnham KP, Etches RJ, Janeway CA, Klein J, Olsson M, Parker GA, Trivers RL   +8 more
core   +1 more source

<i>Drosophila</i> Arc1 is not required for male fertility or sperm competition success. [PDF]

MicroPubl Biol, 2023
Gordon K, Gonzales P, Lee C, Marcin J, Takashima Y, Lazzaro B, Wolfner M.   +6 more
europepmc   +1 more source

Sperm competition and ejaculate economics

Biological Reviews, 2010
Sperm competition was identified in 1970 as a pervasive selective force in post‐copulatory sexual selection that occurs when the ejaculates of different males compete to fertilise a given set of ova. Since then, sperm competition has been much studied both empirically and theoretically.
Parker, G, Pizzari, T
openaire   +2 more sources

Intraspecific morphological variation of the sperm storing organ in two hermaphroditic land snail species

Journal of Biological Research - Thessaloniki, 2019
Background Postcopulatory sexual selection is very important in species with reproductive strategies that involve multiple mating and prolonged sperm storage.
Alexandra Staikou, Evripidis Koemtzopoulos   +1 more
doaj   +1 more source

Enduring Sperm Competition

Journal of Avian Biology, 1994
continued with the trip. On getting home late that night I put the corpse in the fridge and the next morning, some 20 hours after I'd found the bird, I dissected out its testes and seminal glomera a sperm store at the end of the vas deferens which forms the cloacal protuberance in male passerines. To count the total numbers of spermatozoa I diluted the
openaire   +1 more source

Spawning behavior of Arctic charr (Salvelinus alpinus): Spawning synchrony, vibrational communication, and mate guarding

Ecology and Evolution, 2018
A mismatch in synchrony between male and female gamete release in external fertilizers can result in reduced or failed fertilization, sperm competition, and reduced paternity.
Magnus B. Brattli, Torvald B. Egeland, Jarle T. Nordeide, Ivar Folstad   +3 more
doaj   +1 more source

Intergenerational response to sperm competition risk in an invasive mammal. [PDF]

Proc Biol Sci, 2023
Firman RC, André GI, Hadlow JH, Simmons LW.   +3 more
europepmc   +1 more source

Body size of virtual rivals affects ejaculate size in sticklebacks [PDF]

, 2017
Sperm competition occurs when sperm of two or more males compete to fertilize a given set of eggs. Theories on sperm competition expect males under high risk of sperm competition to increase ejaculate size.
Bakker, Theo C. M., Largiadèr, Carlo R., Zbinden, Marc   +2 more
core