Results 41 to 50 of about 67,350 (184)
Sperm precedence in zebra finches does not require special mechanisms of sperm competition [PDF]
, 1995 Competition between the spermatozoa of different males to fertilize the eggs of a single female acts as a selection pressure on the behaviour of males and females.
Birkhead, T.R. +2 more
core +2 more sources
Frontiers in Ecology and Evolution, 2015 How much of a fitness benefit is obtained by dominant males of external fertilizers from releasing ejaculates in synchrony with female egg-release when engaging in sperm competition, and what is the most important sperm trait for paternity in these ...
Torvald Blikra Egeland +4 more
doaj +1 more source
Sperm competition in birds [PDF]
Reviews of Reproduction, 1987 Sperm competition in birds occurs when a female is inseminated by more than one male during a single breeding cycle. Despite most birds being socially monogamous, sperm competition is widespread and results in frequent extra-pair paternity. Sperm competition is a fundamental part of sexual selection since it results in differential reproductive success
openaire +3 more sources
Exceptional sperm cooperation in the wood mouse [PDF]
, 2002 Spermatozoa from a single male will compete for fertilization of ova with spermatozoa from another male when present in the female reproductive tract at the same time.
AH Harcourt +32 more
core +1 more source
Rival seminal fluid induces enhanced sperm motility in a polyandrous ant
BMC Evolutionary Biology, 2018 Background Promiscuous mating and sperm competition often induce arms races between the sexes with detrimental outcomes for females. However, ants with multiply-inseminated queens have only a single time-window for sperm competition and queens are ...
Joanito Liberti +2 more
doaj +1 more source
Frontiers in Ecology and Evolution, 2023 Kin selection on one hand, and gamete interactions in post-ejaculatory sexual selection on the other are two major research themes that have risen to prominence over the past half century and have simultaneously developed into central fields of research ...
Lauri Myllymaa, Jussi Lehtonen
doaj +1 more source
Bayesian Sperm Competition Estimates
Genetics, 2003 Abstract We introduce a Bayesian method for estimating parameters for a model of multiple mating and sperm displacement from genotype counts of brood-structured data. The model is initially targeted for Drosophila melanogaster, but is easily adapted to other organisms. The method is appropriate for use with field studies where the number
Beatrix, Jones, Andrew G, Clark
openaire +2 more sources
Hogna radiata males do not deplete their sperm in a single mating [PDF]
, 2013 To the extent that sperm production or mating opportunities are limited, males are expected to allocate their sperm optimally, so as to increase their overall fitness.
Cuadrado, Mariano +1 more
core +2 more sources
Effects of metabolic rate and sperm competition on the fatty-acid composition of mammalian sperm [PDF]
, 2016 The sperm membrane is a key structure affecting sperm function and thus reproductive success. Spermatozoa are highly specialized and differentiated cells that undergo a long series of processes in the male and female reproductive tracts until they reach ...
Delbarco-Trillo, Javier +1 more
core +1 more source
Sperm removal during copulation confirmed in the oldest extant damselfly, Hemiphlebia mirabilis [PDF]
PeerJ, 2016 Postcopulatory sexual selection may favour mechanisms to reduce sperm competition, like physical sperm removal by males. To investigate the origin of sperm removal, I studied the reproductive behaviour and mechanisms of sperm competition in the only ...
Adolfo Cordero-Rivera
doaj +2 more sources