Male age and its association with reproductive traits in captive and wild house sparrows

Journal of Evolutionary Biology, Год журнала: 2019, Номер 32(12), С. 1432 - 1443

Опубликована: Сен. 17, 2019

Abstract Evolutionary theory predicts that females seek extra‐pair fertilizations from high‐quality males. In socially monogamous bird species, it is often old males are most successful in fertilizations. Adaptive models of female mate choice suggest may produce offspring higher genetic quality than young because they have proven their survivability. However, also more likely to show signs reproductive senescence, such as reduced sperm quality. To better understand why account for a disproportionally large number and what the consequences mating with are, we compared several traits both captive wild house sparrows, Passer domesticus . Sperm morphological cloacal protuberance volume (a proxy load) did not differ substantially. delivered almost three times female's egg We discuss possibility post‐copulatory advantage over mated

Язык: Английский

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Repeatability of sperm size and motility within and between seasons in the Barn Swallow (Hirundo rustica)

Journal of Ornithology, Год журнала: 2013, Номер 154(4), С. 955 - 963

Опубликована: Май 6, 2013

Язык: Английский

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Sperm divergence in a passerine contact zone: Indication of reinforcement at the gametic level

Evolution, Год журнала: 2018, Номер 73(2), С. 202 - 213

Опубликована: Дек. 31, 2018

Postcopulatory sexual selection may promote evolutionary diversification in sperm form, but the contribution of between‐species divergence morphology to origin reproductive isolation and speciation remains little understood. To assess possible role isolation, we studied two closely related bird species, common nightingale (Luscinia megarhynchos) thrush luscinia), that hybridize a secondary contact zone spanning Central Eastern Europe. We found: (1) striking between species total length, accompanied by difference length mitochondrial component; (2) greater sympatry than allopatry, with evidence for character displacement head detected L. megarhynchos; (3) interspecific hybrids showing intermediate parental no decreased quality (the proportion abnormal spermatozoa ejaculates). Our results demonstrate does not result intrinsic postzygotic contribute postcopulatory prezygotic isolation. This could be strengthened reinforcement.

Язык: Английский

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Sperm morphology and evidence for sperm competition among parrots

Journal of Evolutionary Biology, Год журнала: 2019, Номер 32(8), С. 856 - 867

Опубликована: Июнь 27, 2019

Abstract Sperm competition is an important component of post‐copulatory sexual selection that has shaped the evolution sperm morphology. Previous studies have reported a concurrently directional and stabilizing effect on size. For example, bird species show higher levels extrapair paternity larger testes (proxies for intensity competition) longer lower coefficients variation in length, both within between males. this reason, these traits been proposed as indexes to estimate level which other measures are not available. The relationship morphology explored mostly breed temperate zones, with main focus passerine birds. We measured 62 parrot mainly tropics related length life‐history potentially indicative competition. showed negatively correlated within‐male coefficient positively mass. also sexually dichromatic gregarious species. Our results support general validity hypothesis drives analyses suggest tropical species, more intense among at densities.

Язык: Английский

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Longer Sperm Swim More Slowly in the Canary Islands Chiffchaff

Cells, Год журнала: 2021, Номер 10(6), С. 1358 - 1358

Опубликована: Май 31, 2021

Sperm swimming performance affects male fertilization success, particularly in species with high sperm competition. Understanding how morphology impacts is therefore important. speed hypothesized to increase total length, relative flagellum length (with the generating forward thrust), and midpiece (as contains mitochondria). We tested these hypotheses for divergence traits five island populations of Canary Islands chiffchaff (Phylloscopus canariensis). confirmed incipient mitochondrial DNA differentiation between Gran Canaria other islands. correlated negatively did not correlate (for only). The proportion motile cells increased on only. was similar across thus add a growing number studies passerine birds that do support morphology–swimming hypotheses. suggest mechanics are sufficiently different from mammalian predictions hydrodynamic models should no longer be applied this taxon. While both likely under selection passerines, relationship them requires further elucidation.

Язык: Английский

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No evidence for effects of formalin storage duration or solvent medium exposure on avian sperm morphology

Journal of Ornithology, Год журнала: 2015, Номер 157(2), С. 647 - 652

Опубликована: Дек. 29, 2015

Язык: Английский

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Sperm Morphology and Male Age in Black-Throated Blue Warblers, an Ecological Model System

Animals, Год журнала: 2020, Номер 10(7), С. 1175 - 1175

Опубликована: Июль 10, 2020

Extra-pair paternity may drive selection on spermatozoa and ejaculate characteristics through sperm competition cryptic female choice. Here, we examine morphology in the black-throated blue warbler (Setophaga caerulescens), an ecological model species where extra-pair is frequent linked with male age. We test whether relates to several aspects of phenotype known or suspected affect success. Sperm did not correlate size white wing spot, a social status signal, nor volume cloacal protuberance. However, older males tended have longer cells. Although sample was limited, this pattern intriguing, as cells be advantageous post-copulatory sexual larger testes higher success species. Changes age are observed other birds, though they been insects fishes. More research needed clarify its role fertilizations well-studied

Язык: 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, Год журнала: 2018, Номер 32(3), С. 205 - 217

Опубликована: Ноя. 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

Язык: Английский

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PFAS Exposure is Associated with a Lower Spermatic Quality in an Arctic Seabird

Environmental Science & Technology, Год журнала: 2024, Номер 58(44), С. 19617 - 19626

Опубликована: Окт. 23, 2024

Several studies have reported an increasing occurrence of poly- and perfluorinated alkyl substances (PFASs) in Arctic wildlife tissues, raising concerns due to their resistance degradation. While some research has explored PFAS's physiological effects on birds, impact reproductive functions, particularly sperm quality, remains underexplored. This study aims assess (1) potential association between PFAS concentrations blood quality black-legged kittiwakes (Rissa tridactyla), focusing the percentage abnormal spermatozoa, velocity, motility, morphology; (2) examine plasma levels testosterone, corticosterone, luteinizing hormone with both parameters possible endocrine disrupting pathways. Our findings reveal a positive correlation concentration longer-chain perfluoroalkyl carboxylates (PFCA; C11–C14) kittiwakes. Additionally, we observed that two other (i.e., PFOSlin PFNA), distinct from those associated abnormalities, were positively correlated stress corticosterone. These emphasize potentially harmful substance-specific long-chain PFCAs seabirds need for further into pollutants as additional detrimental effect birds.

Язык: Английский

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

Biological Journal of the Linnean Society, Год журнала: 2016, Номер 119(4), С. 932 - 942

Опубликована: Июль 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.

Язык: Английский

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