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Sperm competition

  • RESEARCH ARTICLE
    Social dominance, but not parasite load, affects sperm quality and sperm redox status in house sparrows
    Sylvain Losdat, Alfonso Rojas Mora, Caroline Bellut, Rémi Chargé, Valentina Falchi, Gaétan Glauser, Armelle Vallat, Fabrice Helfenstein
    Journal of Experimental Biology 2019 222: jeb200675 doi: 10.1242/jeb.200675 Published 10 September 2019

    Summary: Immunity does not necessarily affect sperm performance or sperm and blood oxidative balance; however, social hierarchy and the relative soma/germline oxidative balance determine sperm performance.

  • RESEARCH ARTICLE
    Seminal fluid enhances competitiveness of territorial males' sperm in a fish with alternative male reproductive tactics
    Federica Poli, Lisa Locatello, Maria B. Rasotto
    Journal of Experimental Biology 2018 221: jeb175976 doi: 10.1242/jeb.175976 Published 30 July 2018

    Summary: Dynamics of ejaculate release may influence the role of seminal fluid in competitive contexts. In the black goby, where interaction between rival ejaculates is reduced, its function differs depending on male mating tactics.

  • RESEARCH ARTICLE
    Microsurgical manipulation reveals pre-copulatory function of key genital sclerites
    Oliver T. M. Cocks, Paul E. Eady
    Journal of Experimental Biology 2018 221: jeb173427 doi: 10.1242/jeb.173427 Published 20 April 2018

    Summary: Insect genitalia are fashioned from numerous constituent parts but the function of individual components is poorly understood. Microsurgical manipulation reveals the parameres and end-plate to be crucial in securing copulation in Callosobruchus maculatus.

  • RESEARCH ARTICLE
    Oxidative stress affects sperm performance and ejaculate redox status in subordinate house sparrows
    Alfonso Rojas Mora, Alexandra Firth, Sophie Blareau, Armelle Vallat, Fabrice Helfenstein
    Journal of Experimental Biology 2017 220: 2577-2588; doi: 10.1242/jeb.154799

    Summary: Oxidative stress affects sperm velocity of low-ranked house sparrows.

  • RESEARCH ARTICLE
    Ovarian fluid impacts flagellar beating and biomechanical metrics of sperm between alternative reproductive tactics
    Ian A. E. Butts, Galina Prokopchuk, Vojtěch Kašpar, Jacky Cosson, Trevor E. Pitcher
    Journal of Experimental Biology 2017 220: 2210-2217; doi: 10.1242/jeb.154195

    Highlighted Article: In Chinook salmon, sperm biomechanics may be driving divergence in competitive reproductive success between alternative reproductive tactics.

  • RESEARCH ARTICLE
    Self-fertilization, sex allocation and spermatogenesis kinetics in the hypodermically inseminating flatworm Macrostomum pusillum
    Athina Giannakara, Steven A. Ramm
    Journal of Experimental Biology 2017 220: 1568-1577; doi: 10.1242/jeb.149682

    Summary: The flatworm Macrostomum pusillum is capable of self-fertilization, and its sexual biology suggests that this is a frequent or even the exclusive reproductive mode in this species.

  • RESEARCH ARTICLE
    Sperm chemotaxis promotes individual fertilization success in sea urchins
    Yasmeen H. Hussain, Jeffrey S. Guasto, Richard K. Zimmer, Roman Stocker, Jeffrey A. Riffell
    Journal of Experimental Biology 2016 219: 1458-1466; doi: 10.1242/jeb.134924

    Summary: Gamete traits, including sperm motility, play a strong role in sperm competition and fertilization; sperm chemotaxis promotes fertilization, and individual male fertilization correlates with sperm chemotactic behavior.

  • RESEARCH ARTICLE
    Modification of sperm quality after sexual abstinence in Seba's short-tailed bat, Carollia perspicillata
    Charlotte Wesseling, Nicolas Fasel, Heinz Richner, Fabrice Helfenstein
    Journal of Experimental Biology 2016 219: 1363-1368; doi: 10.1242/jeb.133843

    Highlighted Article: A sexual abstinence experiment suggests that a difference in copulation frequency rather than an adaption to sperm competition provides Carollia perspicillata sneaker males with higher sperm quality than harem males.

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