Results 41 to 50 of about 67,643 (303)

On the relative effect of spawning asynchrony, sperm quantity and sperm quality on paternity under sperm competition in an external fertilizer

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, Torvald Blikra Egeland, Geir eRudolfsen, Jarle Tryti Nordeide, Ivar eFolstad   +4 more
doaj   +1 more source

Structural variation in Drosophila melanogaster spermathecal ducts and its association with sperm competition dynamics [PDF]

Royal Society Open Science, 2020
The ability of female insects to retain and use sperm for days, months, or even years after mating requires specialized storage organs in the reproductive tract.
Ben R. Hopkins, Irem Sepil, Stuart Wigby   +2 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

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, Boris Baer, Jacobus J. Boomsma   +2 more
doaj   +1 more source

Kin selection in interactions between gametes: Gamete competition, gamete limitation, and sex allocation

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

Postcopulatory sexual selection [PDF]

, 2002
The female reproductive tract is where competition between the sperm of different males takes place, aided and abetted by the female herself. Intense postcopulatory sexual selection fosters inter-sexual conflict and drives rapid evolutionary change to ...
A Civetta, A Singson, A Singson, AB Carvalho, AJ Bateman, AK Chippindale, AK Chippindale, AP Møller, AP Møller, B Hellriegel, B Holland, B Kempenaers, BC Sheldon, BC Sheldon, BT Preston, C Darwin, CW LaMunyon, D Carré, D Childress, D Haig, D Hosken, D Pfaff, D Vacquier, D Yamamoto, DA Roff, DB Lank, DC Presgraves, DC Shakes, DJ Begun, DJ Hosken, DM Rand, DW Coltman, E Ottaviano, E Ruiz-Pesini, EC Metz, ED Ketterson, EH Nicholls, EJA Cunningham, FD Karim, FM Hunter, FM Hunter, G Arnqvist, G Arnqvist, GA Parker, GA Parker, GA Parker, GA Parker, GA Parker, GA Parker, H Montell, HDM Moore, IM Matthews, J Nance, JB Wolf, JDD Bishop, JHJ Van der Werf, JK Waage, JM Cheverud, JM Martin-Villa, JS Takahashi, JV Briskie, JV Briskie, K Uchida, KA Hughes, L Andersson, L Delph, L Keller, LD Hurst, LW Simmons, LW Simmons, M Andersson, M Edvardsson, M Lynch, M Ridley, MK Dahle, N Wilson, P David, P Jivoff, P Stockely, P Stockley, P Ward, P Ward, PA Cook, PS Chen, R Lande, R Thornhill, RD Catalano, RL Smith, RL Smith, RL Trivers, RR Baker, RR Snook, RR Snook, RR Warner, S Gavrilets, S Palumbi, S Pitnick, S Pitnick, S Pitnick, S Stearns, SA Frank, SM Shuster, SM Shuster, SW L' Hernault, T Chapman, T Chapman, T Chapman, T Pizzari, T Pizzari, T Prout, T Prout, T Tregenza, T Tregenza, TFC Mackay, TH Clutton-Brock, TM Panhuis, TR Birkhead, TR Birkhead, TR Birkhead, TR Birkhead, TR Birkhead, TR Birkhead, TR Halliday, UW Huck, W Swanson, WG Eberhard, WJ Swanson, WJ Swanson, WJ Swanson, WJ Swanson, WR Rice, WR Rice, WR Rice   +132 more
core   +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

Impact of low sperm competition on male reproductive trait allometries in a bush-cricket

BMC Evolutionary Biology, 2019
Background Studying reproductive trait allometries can help to understand optimal male investment strategies under sexual selection. In promiscuous mating systems, studies across several taxa suggest that testes allometry is usually positive, presumably ...
Lennart Winkler, Leon M. Kirch, Klaus Reinhold, Steven A. Ramm   +3 more
doaj   +1 more source

The effects of male social environment on sperm phenotype and genome integrity [PDF]

, 2019
Sperm function and quality are primary determinants of male reproductive performance and hence fitness. The presence of rival males has been shown to affect ejaculate and sperm traits in a wide range of taxa.
Devaux, Caroline, Durieux, Mathilde, Gómez Torres, María José, Immler, Simone, Romero, Alejandro, Silva, Willian T. A. F., Sáez Espinosa, Paula, Torijo Boix, Stéphanie   +7 more
core   +4 more sources

Identifying transcription factors controlling the basal expression of human MRP4 highlights a substantial role for Sp1

FEBS Open Bio, EarlyView.
The MRP4 transporter exports several drugs and signaling molecules. Here, we identified key promoter elements regulating basal MRP4 expression. Using reporter assays, we defined a conserved region with essential Sp1 and contributory Ets sites, which controlled basal MRP4 expression.
Debora Singer, Angelique Kragl, Katrin Ziems, Juliane Glaubitz, Sophie Grammbauer, Susanne Hildebrandt, Mladen V. Tzvetkov, Gabriele Jedlitschky   +7 more
wiley   +1 more source