Sperm variation in Great Tit males (Parus major) is linked to a haematological health-related trait, but not ornamentation

Journal of Ornithology, Journal Year: 2018, Volume and Issue: 159(3), P. 815 - 822

Published: May 17, 2018

Language: Английский

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Moderate heritability and low evolvability of sperm morphology in a species with high risk of sperm competition, the collared flycatcher Ficedula albicollis

Journal of Evolutionary Biology, Journal Year: 2018, Volume and Issue: 32(3), P. 205 - 217

Published: Nov. 18, 2018

Spermatozoa represent the morphologically most diverse type of animal cells and show remarkable variation in size across also within species. To understand evolution this diversity, it is important to reveal what degree genetic or environmental origin whether depends on species' life histories. Here we applied quantitative methods a pedigreed multigenerational data set collared flycatcher Ficedula albicollis, passerine bird with high levels extra-pair paternity, partition sources phenotypic sperm dimensions for first time natural population. Narrow-sense heritability (h2 ) total length amounted 0.44 ± 0.14 SE, whereas corresponding figure evolvability (estimated as coefficient additive variation, CVa was 0.02 0.003 SE. We found an increase individual males between arrival nestling period. This seasonal may reflect constraints production fully elongated spermatozoa shortly after at breeding grounds. There no evidence effect male age dimensions. In many previous studies laboratory populations several insect, mammal avian species, heritabilities morphology were higher, evolvabilities similar. Explanations differences include environment (laboratory vs. wild), intensity sexual selection via competition (high low) architecture that involves unusual linkage disequilibrium coupled overdominance one studied

Language: Английский

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Relationship between pre- and post-copulatory traits inSalvator rufescens(Squamata: Teiidae)

Biological Journal of the Linnean Society, Journal Year: 2016, Volume and Issue: 119(4), P. 932 - 942

Published: July 14, 2016

Understanding pre- and post-copulatory mechanisms of sexual selection can provide insights into the evolution male reproductive strategies. The phenotype-linked fertility hypothesis postulates that sperm quality secondary characteristics will positively co-vary, whereas competition predicts a negative association between those traits. Male traits often show variation throughout period, suggesting relationship may vary temporally. Here, we evaluated character its temporal in Salvator rufescens, south American lizard. We observed jaw muscle principal piece length period. Collectively, our results evidenced trade-off strong seasonal flexibility strategies this lizard species.

Language: Английский

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Measuring sperm swimming performance in birds: effects of dilution, suspension medium, mechanical agitation, and sperm number

Journal of Ornithology, Journal Year: 2019, Volume and Issue: 160(4), P. 1053 - 1063

Published: May 22, 2019

Language: Английский

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How Female-Female Competition Affects Male-Male Competition: Insights into Postcopulatory Sexual Selection from Socially Polyandrous Species

The American Naturalist, Journal Year: 2022, Volume and Issue: 201(3), P. 460 - 471

Published: Oct. 4, 2022

AbstractSexual selection is a major driver of trait variation, and the intensity male competition for mating opportunities has been linked with sperm size across diverse taxa. Mating among females may also shape evolution traits, but effect interplay between female-female male-male on morphology not well understood. We evaluated variation in two species socially polyandrous systems, which compete to mate multiple males. Northern jacanas (Jacana spinosa) wattled (J. jacana) vary their degree social polyandry sexual dimorphism, suggesting differences selection. compared mean variance head, midpiece, tail length breeding stages because these measures have associated competition. found that greater polyandry, northern jacana, longer midpieces tails as marginally lower intraejaculate length. Intraejaculate was significantly copulating males than incubating males, flexibility production cycle stages. Our results indicate stronger more intense by selecting less variable traits. These findings extend frameworks developed monogamous reveal be an important evolutionary force layered atop mates.

Language: Английский

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