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Littérature scientifique sur le sujet « Sperrm competition »

Auteur : Grafiati

Publié le 5 octobre 2024

Mis à jour le 31 juillet 2025

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Articles de revues sur le sujet "Sperrm competition"

André, Gonçalo I., Renée C. Firman, and Leigh W. Simmons. "Phenotypic plasticity in genitalia: baculum shape responds to sperm competition risk in house mice." Proceedings of the Royal Society B: Biological Sciences 285, no. 1882 (2018): 20181086. http://dx.doi.org/10.1098/rspb.2018.1086.

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Males are known to adjust their expenditure on testes growth and sperm production in response to sperm competition risk. Genital morphology can also contribute to competitive fertilization success but whether male genital morphology can respond plastically to the sperm competition environment has received little attention. Here, we exposed male house mice to two different sperm competition environments during their sexual development and quantified phenotypic plasticity in baculum morphology. The sperm competition environment generated plasticity in body growth. Males maturing under sperm comp

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Lüke, Lena, Polly Campbell, María Varea Sánchez, Michael W. Nachman, and Eduardo R. S. Roldan. "Sexual selection on protamine and transition nuclear protein expression in mouse species." Proceedings of the Royal Society B: Biological Sciences 281, no. 1783 (2014): 20133359. http://dx.doi.org/10.1098/rspb.2013.3359.

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Post-copulatory sexual selection in the form of sperm competition is known to influence the evolution of male reproductive proteins in mammals. The relationship between sperm competition and regulatory evolution, however, remains to be explored. Protamines and transition nuclear proteins are involved in the condensation of sperm chromatin and are expected to affect the shape of the sperm head. A hydrodynamically efficient head allows for fast swimming velocity and, therefore, more competitive sperm. Previous comparative studies in rodents have documented a significant association between the l

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Champion de Crespigny, Fleur E., and Nina Wedell. "Wolbachia infection reduces sperm competitive ability in an insect." Proceedings of the Royal Society B: Biological Sciences 273, no. 1593 (2006): 1455–58. http://dx.doi.org/10.1098/rspb.2006.3478.

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The maternally inherited bacterium Wolbachia pipientis imposes significant fitness costs on its hosts. One such cost is decreased sperm production resulting in reduced fertility of male Drosophila simulans infected with cytoplasmic incompatibility (CI) inducing Wolbachia . We tested the hypothesis that Wolbachia infection affects sperm competitive ability and found that Wolbachia infection is indeed associated with reduced success in sperm competition in non-virgin males. In the second male role, infected males sired 71% of the offspring whereas uninfected males sired 82% of offspring. This is

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Hoysak, Drew J., N. Robin Liley, and Eric B. Taylor. "Raffles, roles, and the outcome of sperm competition in sockeye salmon." Canadian Journal of Zoology 82, no. 7 (2004): 1017–26. http://dx.doi.org/10.1139/z04-073.

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In species with male alternative reproductive phenotypes, one phenotype is usually disadvantaged in mating competition. In salmonid fishes, large late-maturing males pair with nesting females and maintain close contact before and during spawning. Small early-maturing males have little contact with nesting females and, during spawning, begin to release sperm after the paired male. The effects of male phenotype and timing of ejaculation on success in sperm competition are not known. In this study, we determined paternity of offspring resulting from in vitro competitive fertilizations to examine

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Engqvist, Leif, and Klaus Reinhold. "Sperm competition games: optimal sperm allocation in response to the size of competing ejaculates." Proceedings of the Royal Society B: Biological Sciences 274, no. 1607 (2006): 209–17. http://dx.doi.org/10.1098/rspb.2006.3722.

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Sperm competition theory predicts that when males are certain of sperm competition, they should decrease sperm investment in matings with an increasing number of competing ejaculates. How males should allocate sperm when competing with differently sized ejaculates, however, has not yet been examined. Here, we report the outcomes of two models assuming variation in males' sperm reserves and males being faced with different amounts of competing sperm. In the first ‘spawning model’, two males compete instantaneously and both are able to assess the sperm competitive ability of each other. In the s

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Vuarin, Pauline, Yves Hingrat, Loïc Lesobre, Michel Saint Jalme, Frédéric Lacroix, and Gabriele Sorci. "Sperm competition accentuates selection on ejaculate attributes." Biology Letters 15, no. 3 (2019): 20180889. http://dx.doi.org/10.1098/rsbl.2018.0889.

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Ejaculate attributes are important factors driving the probability of fertilizing eggs. When females mate with several males, competition between sperm to fertilize eggs should accentuate selection on ejaculate attributes. We tested this hypothesis in the North African houbara bustard ( Chlamydotis undulata undulata ) by comparing the strength of selection acting on two ejaculate attributes when sperm from single males or sperm from different males were used for insemination. In agreement with the prediction, we found that selection on ejaculate attributes was stronger when sperm of different

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Singson, Andrew, Katherine L. Hill, and Steven W. L’Hernault. "Sperm Competition in the Absence of Fertilization in Caenorhabditis elegans." Genetics 152, no. 1 (1999): 201–8. http://dx.doi.org/10.1093/genetics/152.1.201.

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Abstract Hermaphrodite self-fertilization is the primary mode of reproduction in the nematode Caenorhabditis elegans. However, when a hermaphrodite is crossed with a male, nearly all of the oocytes are fertilized by male-derived sperm. This sperm precedence during reproduction is due to the competitive superiority of male-derived sperm and results in a functional suppression of hermaphrodite self-fertility. In this study, mutant males that inseminate fertilization-defective sperm were used to reveal that sperm competition within a hermaphrodite does not require successful fertilization. Howeve

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Sloan, Nadia S., Maxine Lovegrove, and Leigh W. Simmons. "Social manipulation of sperm competition intensity reduces seminal fluid gene expression." Biology Letters 14, no. 1 (2018): 20170659. http://dx.doi.org/10.1098/rsbl.2017.0659.

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A considerable body of evidence supports the prediction that males should increase their expenditure on the ejaculate in response to sperm competition risk. The prediction that they should reduce their expenditure with increasing sperm competition intensity is less well supported. Moreover, most studies have documented plasticity in sperm numbers. Here we show that male crickets Teleogryllus oceanicus exhibit reduced seminal fluid gene expression and accessory gland mass in response to elevated sperm competition intensity. Together with previous research, our findings suggest that strategic ad

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Firman, Renée C., and Leigh W. Simmons. "Sperm midpiece length predicts sperm swimming velocity in house mice." Biology Letters 6, no. 4 (2010): 513–16. http://dx.doi.org/10.1098/rsbl.2009.1027.

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Evolutionary biologists have argued that there should be a positive relationship between sperm size and sperm velocity, and that these traits influence a male's sperm competitiveness. However, comparative analyses investigating the evolutionary associations between sperm competition risk and sperm morphology have reported inconsistent patterns of association, and in vitro sperm competition experiments have further confused the issue; in some species, males with longer sperm achieve more competitive fertilization, while in other species males with shorter sperm have greater sperm competitivenes

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Calhim, Sara, Stephen Pruett-Jones, Michael S. Webster, and Melissah Rowe. "Asymmetries in reproductive anatomy: insights from promiscuous songbirds." Biological Journal of the Linnean Society 128, no. 3 (2019): 569–82. http://dx.doi.org/10.1093/biolinnean/blz100.

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Abstract Directional asymmetry in gonad size is commonly observed in vertebrates and is particularly pronounced in birds, where the left testis is frequently larger than the right. The adaptive significance of directional asymmetry in testis size is poorly understood, and whether it extends beyond the testes (i.e. side-correspondent asymmetry along the reproductive tract) has rarely been considered. Using the Maluridae, a songbird family exhibiting variation in levels of sperm competition and directional testis asymmetry, yet similar in ecology and life history, we investigated the relative ro

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Thèses sur le sujet "Sperrm competition"

Meunier, Léna. "Reproductive biology and senescence impact on postcopulatory sexual selection in a wild polyandrous bird, the North African Houbara Bustard (Chlamydotis undulata undulata)." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCK028.

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Résumé La polyandrie, lorsque les femelles s'accouplent avec plusieurs mâles, augmente les possibilités de sélection sexuelle, car outre la compétition entre les mâles pour l'accès à la femelle (sélection sexuelle pré-copulatoire), les spermatozoïdes des différents mâles sont également en compétition pour la fécondation (sélection sexuelle post-copulatoire). En conséquence, la plupart des descendants sont engendrés par le dernier mâle qui s’est accouplé avec la femelle, un phénomène appelé "last male precedence" (LMP). En plus de l'ordre d'accouplement, la quantité et la qualité des spermatozo

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Siva-Jothy, M. T. "Sperm competition in the odonata." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370301.

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Eady, Paul E. "Sperm competition in Callosobruchus maculatus." Thesis, University of Sheffield, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263760.

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Fryer, Timothy James Osborne. "ESS models of sperm competition." Thesis, University of Sheffield, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266803.

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Gilbert, Lucy. "Sperm competition in the western gull." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389759.

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Cook, Penelope Anne. "Sperm competition in butterflies and moths." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307641.

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Lovell-Mansbridge, Claire. "Sperm competition in the feral pigeon Columba livia." Thesis, University of Sheffield, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364193.

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Hunter, Fiona M. "Sperm competition in the Northern fulmar (Fulmaris glacialis)." Thesis, University of Sheffield, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304668.

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Ramm, Steven Andrew. "Sperm competition and its evolutionary consequences in rodents." Thesis, University of Liverpool, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436259.

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Preston, Brian T. "Sexual selection and sperm competition in Soay sheep." Thesis, University of Stirling, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391526.

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Livres sur le sujet "Sperrm competition"

Watanabe, Mamoru. Sperm Competition in Butterflies. Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-55945-0.

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A, Bellis Mark, ed. Human sperm competition: Copulation, masturbation, and infidelity. Chapman & Hall, 1995.

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Baker, R. R. Human sperm competition: Copulation, masturbation, and infertility. Chapman and Hall, 1993.

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1971-, Shackelford Todd K., and Pound Nicholas 1971-, eds. Sperm competitions in humans: Classic and contemporary readings. Springer, 2006.

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Fu, Peng. Sperm competition and alternative mating tactics in bluegill sunfish. National Library of Canada, 2000.

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E, Johnson J. Spearfishing competitions in South Australia, 1983-1984. Dept. of Fisheries, 1985.

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Ashok, Agarwal, Borges Edson, and Amanda S. Setti. Non-invasive sperm selection for in vitro fertilization: Novel concepts and methods. Springer, 2015.

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Watanabe, Mamoru. Sperm Competition in Butterflies. Springer, 2018.

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Shackelford, Todd K., and Nicholas Pound, eds. Sperm Competition in Humans. Springer US, 2006. http://dx.doi.org/10.1007/0-387-28039-1.

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Shackelford, Todd K., and Nicholas Pound, eds. Sperm Competition in Humans. Springer US, 2006. http://dx.doi.org/10.1007/978-0-387-28039-4.

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Chapitres de livres sur le sujet "Sperrm competition"

DeLecce, Tara. "Sperm Competition." In Encyclopedia of Personality and Individual Differences. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-319-24612-3_1269.

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McKibbin, William F. "Sperm Competition." In Encyclopedia of Evolutionary Psychological Science. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-16999-6_73-1.

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Durrant, Kate L. "Sperm Competition." In Encyclopedia of Animal Cognition and Behavior. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-319-55065-7_438.

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DeLecce, Tara. "Sperm Competition." In Encyclopedia of Personality and Individual Differences. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28099-8_1269-1.

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Durrant, Kate L. "Sperm Competition." In Encyclopedia of Animal Cognition and Behavior. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-47829-6_438-1.

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Cordero-Rivera, Adolfo. "Sperm Competition." In Reproductive Strategies in Insects. CRC Press, 2022. http://dx.doi.org/10.1201/9781003043195-10.

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McKibbin, William F. "Sperm Competition." In Encyclopedia of Evolutionary Psychological Science. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-319-19650-3_73.

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Baer, Boris. "Sperm Competition." In Encyclopedia of Social Insects. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-28102-1_114.

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Baer, Boris. "Sperm Competition." In Encyclopedia of Social Insects. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-319-90306-4_114-1.

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Kelly, Clint D., and Michael D. Jennions. "Sperm Competition Theory." In Encyclopedia of Evolutionary Psychological Science. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-16999-6_1941-1.

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Actes de conférences sur le sujet "Sperrm competition"

Khan, H., M. Alam, S. Al-Kuwari, and Y. Faheem. "OFFENSIVE AI: UNIFICATION OF EMAIL GENERATION THROUGH GPT-2 MODEL WITH A GAME-THEORETIC APPROACH FOR SPEAR-PHISHING ATTACKS." In Competitive Advantage in the Digital Economy (CADE 2021). Institution of Engineering and Technology, 2021. http://dx.doi.org/10.1049/icp.2021.2422.

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Pavlović, D. Petar, and Kristina Pantelić-Babić. "Development of sports and other forms of physical activities in Herzegovina." In Antropološki i teoantropološki pogled na fizičke aktivnosti (11). Univerzitet u Prištini-Kosovska Mitrovica - Fakultet za sport i fizičko vaspitanje u Leposaviću, Leposavić, 2025. https://doi.org/10.5937/atavpa25010p.

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It is known that throughout history the people of Herzegovina have been good and skilled fighters and competitors, especially in wrestling, boxing, throwing maces, spears and knives, fencing, etc. Those fighting skills and various competitions were traditional activities of Herzegovinians and were nurtured, preserved and passed down from generation to generation. In the Middle Ages, in the area of today's Herzegovina, physical activities were nurtured and practiced, as well as in neighboring areas and countries. During the Turkish occupation (1463-1878) there was a halt in their development, w

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Zenic, Natasa, Admir Terzic, and Ivan Kvesic. "Determinants of changes in physical activity levels in late adolescence; prospective analysis in urban communities." In 12th International Conference on Kinanthropology. Masaryk University Press, 2020. http://dx.doi.org/10.5817/cz.muni.p210-9631-2020-39.

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Purpose: Physical activity levels (PA-levels) significantly decline during adolescence, and sport participation during childhood and adolescence is frequently emphasized as protec-tive factors of PA-decline. However, there is a lack of studies which specifically examined sport-related factors and its influence on changes in PA (PA-changes) in adolescence. This study aimed to prospectively observe sport factors as: (i) correlates of PA-levels and (ii) pre-dictors of PA-changes in the period between 16 and 18 years of age among urban adoles-cents from Bosnia and Herzegovina. Methods: The sample

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Rapports d'organisations sur le sujet "Sperrm competition"

Elizur, Abigail, Amir Sagi, Gideon Hulata, Clive Jones, and Wayne Knibb. Improving Crustacean Aquaculture Production Efficiencies through Development of Monosex Populations Using Endocrine and Molecular Manipulations. United States Department of Agriculture, 2010. http://dx.doi.org/10.32747/2010.7613890.bard.

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Background Most of Australian prawn aquaculture production is based on P. monodon. However, the Australian industry is under intense competition from lower priced overseas imports. The availability of all-female monosex populations, by virtue of their large size and associated premium prize, will offer competitive advantage to the industry which desperately needs to counteract competitors within this market. As for the redclaw production in Israel, although it is at its infancy, the growers realized that the production of males is extremely advantageous and that such management strategy will c

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