Postcopulatory sexual selection is associated with accelerated evolution of sperm morphology

Evolution, Год журнала: 2015, Номер 69(4), С. 1044 - 1052

Опубликована: Фев. 5, 2015

Rapid diversification of sexual traits is frequently attributed to selection, though explicit tests this hypothesis remain limited. Spermatozoa exhibit remarkable variability in size and shape, studies report a correlation between sperm morphology (sperm length shape) competition risk or female reproductive tract morphology. However, whether postcopulatory processes (e.g., cryptic choice) influence the speed evolutionary form unknown. Using passerine birds, we quantified rates divergence among lineages (i.e., species pairs) determined these varied with level (estimated as relative testes mass). We found that mass was significantly positively associated more rapid phenotypic midpiece flagellum lengths, well total length. In contrast, there no association head size, models suggested evolutionarily constrained. Our results are first show an strength evolution, suggest selection promotes

Язык: Английский

---

The role of female reproductive fluid in sperm competition

Philosophical Transactions of the Royal Society B Biological Sciences, Год журнала: 2020, Номер 375(1813), С. 20200077 - 20200077

Опубликована: Окт. 18, 2020

The role of non-gametic components the ejaculate (seminal fluid) in fertility and sperm competitiveness is now well established. Surprisingly, however, we know far less about female reproductive fluid (FRF) context sexual selection, insights into male–FRF interactions competition have only recently emerged. Despite this limited knowledge, evidence from taxonomically diverse species has revealed effects FRF on traits that previously been implicated studies competition. Specifically, through differential a range traits, including chemoattraction alterations velocity, shown to exert positive phenotypic males are preferred as mating partners, or those most compatible genetically males. these tantalizing putative sexually selected functions FRF, largely lack mechanistic understanding processes. Taken together, presented here highlights likely ubiquity FRF-regulated biases fertilization success across taxa, thus potentially elevating importance other so studied This article part theme issue ‘Fifty years competition'.

Язык: Английский

---

Females discriminate against heterospecific sperm in a natural hybrid zone

Evolution, Год журнала: 2016, Номер 70(8), С. 1844 - 1855

Опубликована: Июнь 17, 2016

When hybridization is maladaptive, species‐specific mate preferences are selectively favored, but low availability may constrain species‐assortative pairing. Females paired to heterospecifics then benefit by copulating with multiple males and subsequently favoring sperm of conspecifics. Whether such mechanisms for biasing paternity toward conspecifics act as important reproductive barriers in socially monogamous vertebrate species remains be determined. We use a combination long‐term breeding records from natural hybrid zone between collared pied flycatchers (Ficedula albicollis F. hypoleuca), an vitro experiment comparing conspecific heterospecific performance female tract fluid, evaluate the potential significance cryptic choice. show that females most at risk hybridizing (pied flycatchers) frequently copulate able inhibit performance. The negative effect on was strongest flycatcher were likely have been previously exposed sperm. thus demonstrate barrier acts after copulation before fertilization vertebrate. While evolutionary history this unknown, our results imply there opportunity it accentuated via reinforcement‐like process.

Язык: Английский

---

Molecular Diversification of the Seminal Fluid Proteome in a Recently Diverged Passerine Species Pair

Molecular Biology and Evolution, Год журнала: 2019, Номер 37(2), С. 488 - 506

Опубликована: Окт. 29, 2019

Seminal fluid proteins (SFPs) mediate an array of postmating reproductive processes that influence fertilization and fertility. As such, it is widely held SFPs may contribute to postmating, prezygotic barriers between closely related taxa. We investigated seminal (SF) diversification in a recently diverged passerine species pair (Passer domesticus Passer hispaniolensis) using combination proteomic comparative evolutionary genomic approaches. First, we characterized compared the SF proteome two species, revealing consistencies with known aspects SFP biology function other taxa, including presence involved immunity sperm maturation. Second, whole-genome resequencing data, assessed patterns differentiation house Spanish sparrows. These analyses detected divergent selection on immunity-related genes positive selective sweeps regions containing number also exhibited protein abundance species. Finally, analyzed molecular evolution across 11 found significantly higher rate rest genome, as well significant enrichments for functional pathways set positively selected genes. Our results suggest important determinant composition evolution. Assessing role speciation taxa should be prioritized given potential incompatibilities

Язык: Английский

---

Endless forms of sexual selection

PeerJ, Год журнала: 2019, Номер 7, С. e7988 - e7988

Опубликована: Ноя. 5, 2019

In recent years, the field of sexual selection has exploded, with advances in theoretical and empirical research complementing each other exciting ways. This perspective piece is product a “stock-taking” workshop on conflict. Our aim to identify deliberate outstanding questions stimulate discussion rather than provide comprehensive overview entire field. These are organized into four thematic sections we deem essential First focus evolution mate choice mating systems. Variation quality can generate both competition opposite sex, implications for Limitations may dictate importance direct vs. indirect benefits decisions consequently, systems, especially regard polyandry. Second, how sender receiver mechanisms shape signal design. Mediation honest content likely depends integration temporally variable social physiological costs that challenging measure. We view neuroethology sensory cognitive biases as main key form ‘aesthetic sense’ proposed by Darwin. Since bias sufficient initiate drive ornament or armament exaggeration, without genetically correlated even coevolving receiver, this be appropriate ‘null model’ selection. Thirdly, genetic architecture sexually selected traits. Despite modern molecular techniques, number identity genes underlying performance, display secondary traits remains largely unknown. In-depth investigations basis dimorphism context long-term studies will reveal constraints trajectories trait evolution. Finally, conflict drivers speciation. Population divergence speciation often influenced an interplay between natural The extent which promotes counteracts population vary depending well covariance local adaptation. Additionally, post-copulatory processes, such against heterospecific sperm, influence propose efforts resolve these themes catalyze conceptual progress selection, offer potential avenues advance progress.

Язык: Английский

---

Synthesis and Scope of the Role of Postmating Prezygotic Isolation in Speciation

Cold Spring Harbor Perspectives in Biology, Год журнала: 2023, Номер 16(10), С. a041429 - a041429

Опубликована: Дек. 27, 2023

How barriers to gene flow arise and are maintained key questions in evolutionary biology. Speciation research has mainly focused on that occur either before mating or after zygote formation. In comparison, postmating prezygotic (PMPZ) isolation-a barrier acts gamete release but formation-is less frequently investigated may hold a unique role generating biodiversity. Here we discuss the distinctive features of PMPZ isolation, including primary drivers molecular mechanisms underpinning isolation. We then present first comprehensive survey isolation research, revealing it is widespread form across eukaryotes. The also exposes obstacles studying part attributable challenges involved directly measuring uncovering its causal mechanisms. Finally, identify outstanding knowledge gaps provide recommendations for improving future This will allow us better understand nature this often-neglected reproductive contribution speciation.

Язык: Английский

---

Morphology‐function relationships and repeatability in the sperm of Passer sparrows

Journal of Morphology, Год журнала: 2014, Номер 276(4), С. 370 - 377

Опубликована: Ноя. 26, 2014

ABSTRACT Sperm performance is likely to be an important determinant of male reproductive success, especially when females copulate with multiple males. Understanding sperm therefore crucial fully understand the evolution strategies. In this study, we examined repeatability morphology and motility measures over three breeding seasons, studied relationships between function. We conducted study in wild‐derived captive house sparrows ( Passer domesticus ) Spanish P. hispaniolensis ). Results for two species were similar. As predicted from results other passerine species, total length was highly repeatable across ejaculates, components moderate. The swimming speed ejaculates lower, but statistically significant, suggesting that velocity may a relatively dynamic trait. Surprisingly, did not correlate relative midpiece, it correlated negatively flagellum length. This pattern opposite what theory predicts differs has been found before. Also contrary previous work, no evidence correlates longevity. These highlight need better understanding function birds. J. Morphol. 276:370–377, 2015. © 2014 Wiley Periodicals, Inc.

Язык: Английский

---

Sperm performance in conspecific and heterospecific female fluid

Ecology and Evolution, Год журнала: 2016, Номер 6(5), С. 1363 - 1377

Опубликована: Янв. 30, 2016

Divergent sexual selection within allopatric populations may result in divergent phenotypes, which can act as reproductive barriers between upon secondary contact. This hypothesis has been most tested on traits involved precopulatory selection, with less work focusing that after copulation and before fertilization (i.e., postcopulatory prezygotic traits), particularly internally fertilizing vertebrates. However, species also drive trait divergence, resulting reduced performance of heterospecific sperm the female tract. Such incompatibilities, arising a by-product allopatry, represent barriers, analogous to species-assortative mating preferences. Here, we for three pairs taxa diverged phenotypes moderate-to-high opportunity (barn swallows Hirundo rustica versus sand martins Riparia riparia, two subspecies bluethroats, Luscinia svecica L. s. namnetum, great tits Parus major blue Cyanistes caeruleus). We swimming fluid from outer tract females, because greatest reduction number birds occurs swim across vagina. Contrary our expectations, swam equally well conspecific suggesting do not these taxon pairs, at this stage fertilization. therefore suggest divergence allopatry is insufficient cause widespread form impaired passerine birds.

Язык: Английский

---

Sperm morphology and performance in relation to postmating prezygotic isolation in two recently diverged passerine species

Scientific Reports, Год журнала: 2022, Номер 12(1)

Опубликована: Дек. 24, 2022

Abstract Divergence in sperm phenotype and female reproductive environment may be a common source of postmating prezygotic (PMPZ) isolation between species. However, compared to other barriers it has received much less attention. In this study, we examined morphology velocity two hybridizing passerine species, the nightingale ( Luscinia megarhynchos ) thrush L. luscinia ). addition, for first time characterized tract fluid proteome. We demonstrate that spermatozoa have significantly longer wider midpiece (proximal part flagellum containing mitochondria) tail nightingale. On hand, they shorter narrower acrosome. Importantly, these differences did not any effect on velocity. Furthermore, from females differentially affect conspecific heterospecific sperm. Our results indicate observed changes acrosome size are unlikely contribute PMPZ through differential tract. could postcopulatory processes, which might involved isolation, such as storage, longevity or sperm-egg interaction.

Язык: Английский

---

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

Journal of Ornithology, Год журнала: 2019, Номер 160(4), С. 1053 - 1063

Опубликована: Май 22, 2019

Язык: Английский

---