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Within-ejaculate sperm competition. [PDF]
Philos Trans R Soc Lond B Biol Sci, 2020 Sperm competition was defined by Geoff Parker 50 years ago as the competition between sperm from two or more males over the fertilization of a set of eggs. Since the publication of his seminal paper, sperm competition has developed into a large field of research, and many aspects are still being discovered.
Sutter A, Immler S.
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Conceptual developments in sperm competition: a very brief synopsis. [PDF]
Philos Trans R Soc Lond B Biol Sci, 2020 The past half century has seen the development of the field of post-ejaculatory sexual selection, the sequel to sexual selection for mate-acquisition (pre-ejaculatory) described by Darwin.
Parker GA.
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Genetic Factors Influencing Sperm Competition [PDF]
Frontiers in Genetics, 2019 Females of many different species often mate with multiple males, creating opportunities for competition among their sperm. Although originally unappreciated, sperm competition is now considered a central form of post-copulatory male–male competition ...
Alberto Civetta, José M. Ranz
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Male alternative reproductive tactics and sperm competition: a meta-analysis. [PDF]
Biol Rev Camb Philos Soc, 2022 In many animal species, males may exhibit one of several discrete, alternative ways of obtaining fertilisations, known as alternative reproductive tactics (ARTs).
Dougherty LR +3 more
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Sperm competition in squamate reptiles. [PDF]
Philos Trans R Soc Lond B Biol Sci, 2020 Multiple paternity is ubiquitous within the polyphyletic group called ‘reptiles', especially within the lizards and snakes. Therefore, the probability of sperm competition occurring, and being intense, is high. Squamates exhibit a diversity of tactics to
Friesen CR, Kahrl AF, Olsson M.
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Sperm competition and fertilization mode in fishes. [PDF]
Philos Trans R Soc Lond B Biol Sci, 2020 Sperm competition is a powerful selective force that has shaped sexual traits throughout animal evolution. Yet, how fertilization mode (i.e. external versus internal fertilization) influences the scope and potential for sperm competition to act on ...
Fitzpatrick JL.
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The role of female reproductive fluid in sperm competition. [PDF]
Philos Trans R Soc Lond B Biol Sci, 2020 The role of non-gametic components of the ejaculate (seminal fluid) in fertility and sperm competitiveness is now well established. Surprisingly, however, we know far less about female reproductive fluid (FRF) in the context of sexual selection, and ...
Gasparini C, Pilastro A, Evans JP.
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Three decades of sperm competition in birds. [PDF]
Philos Trans R Soc Lond B Biol Sci, 2020 In the three decades, since Birkhead and Møller published Sperm competition in birds (1992, Academic Press) more than 1000 papers have been published on this topic, about half of these being empirical studies focused on extrapair paternity.
Birkhead TR, Montgomerie R.
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How sperm competition shapes the evolution of testes and sperm: a meta-analysis. [PDF]
Philos Trans R Soc Lond B Biol Sci, 2020 Females of many species mate with multiple males, thereby inciting competition among ejaculates from rival males for fertilization. In response to increasing sperm competition, males are predicted to enhance their investment in sperm production.
Lüpold S +4 more
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Seminal fluid and accessory male investment in sperm competition. [PDF]
Philos Trans R Soc Lond B Biol Sci, 2020 Sperm production and allocation strategies have been a central concern of sperm competition research for the past 50 years. But during the ‘sexual cascade’ there may be strong selection for alternative routes to maximizing male fitness.
Ramm SA.
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