An alternative hypothesis for the evolution of same-sex sexual behaviour in animals

Nature Ecology & Evolution, Год журнала: 2019, Номер 3(12), С. 1622 - 1631

Опубликована: Ноя. 18, 2019

Same-sex sexual behaviour (SSB) has been recorded in over 1,500 animal species with a widespread distribution across most major clades. Evolutionary biologists have long sought to uncover the adaptive origins of 'homosexual behaviour' an attempt resolve this apparent Darwinian paradox: how SSB repeatedly evolved and persisted despite its presumed fitness costs? This question implicitly assumes that 'heterosexual' or exclusive different-sex (DSB) is baseline condition for animals, from which evolved. We idea necessarily presents evolutionary conundrum, suggest literature includes unchecked assumptions regarding costs, benefits SSB. Instead, we offer alternative null hypothesis origin that, through subtle shift perspective, moves away expectation maintenance problem need solution. argue frequently implicit assumption DSB as ancestral not rigorously examined, instead hypothesize indiscriminate behaviours directed towards all sexes. By shifting lens study behaviour, can more fruitfully examine history diverse strategies. The authors sexes, rather than state same-sex anomalous.

Язык: Английский

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Evolutionary Parasitology

Oxford University Press eBooks, Год журнала: 2021, Номер unknown

Опубликована: Июль 15, 2021

Abstract Parasites are ubiquitous and shape almost every aspect of their hosts, including physiology, behaviour, life histories, the structure microbiota, entire communities. Hence, parasitism is one most potent forces in nature and, without parasites, world would look very different. The book gives an overview over parasite groups diversity defences that hosts have evolved, such as immune systems. Principles evolutionary biology ecology analyse major elements host–parasite interactions, virulence, infection processes, tolerance, resistance, specificity, memory, polymorphisms, within-host dynamics, diseases spaces, many other aspects. Genetics always key these topics. Modelling, furthermore, can predict best strategies for host parasites. Similarly, spread infectious disease epidemiology combines with molecular data genomics. Furthermore, parasites evolved ways to overcome manipulate hosts. Hosts therefore, continuously co-evolve, changes sometimes occurring rapidly, requiring geological times. Many humans emerged from a zoonotic origin, processes governed by basic principles discussed different sections. this integrates fields study phenomena. It summarizes essential topics parasitology will be useful broad audience.

Язык: Английский

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Fertilization mode drives sperm length evolution across the animal tree of life

Nature Ecology & Evolution, Год журнала: 2021, Номер 5(8), С. 1153 - 1164

Опубликована: Июнь 21, 2021

Язык: Английский

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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

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How do freshwater fish sperm find the egg? The physicochemical factors guiding the gamete encounters of externally fertilizing freshwater fish

Reviews in Aquaculture, Год журнала: 2019, Номер 12(2), С. 1165 - 1192

Опубликована: Авг. 13, 2019

Abstract The lifespan of spermatozoa from externally fertilizing freshwater fish ranges a few seconds to several minutes, depending on the species. External factors, such as temperature, background flows and ion composition, play an important role in fertilization success. Specific mechanisms guiding appear be essential maximize sperm–egg encounter under these strenuous conditions. Although some existing data support hypothesis that both ovarian fluid eggs may release chemoattractants significantly affect behaviour outcome, this is still open debate, existence chemotaxis has yet demonstrated; addition, specific supporting guidance gamete selection have not been elucidated. Is natural gametes determined by combination different physicochemical phenomena? Alternatively, species‐specific biased towards their landscape? These questions received more attention new studies revealed potential, distinct reproduction. In review, we discuss empirical hypotheses about highlight synergistic experiments biomathematical modelling explore questions. Finally, challenges understanding behind sperm species, suppose knowledge underlie species elucidate impact traditional aquaculture practice artificial progeny quality sustainability.

Язык: Английский

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Evolutionary interactions between thermal ecology and sexual selection

Ecology Letters, Год журнала: 2022, Номер 25(9), С. 1919 - 1936

Опубликована: Июль 13, 2022

Abstract Thermal ecology and mate competition are both pervasive features of ecological adaptation. A surge recent work has uncovered the diversity ways in which temperature affects mating interactions sexual selection. However, potential for thermal biology reproductive to evolve together as organisms adapt their environment been underappreciated. Here, we develop a series hypotheses regarding (1) not only how system dynamics, but also dynamics can generate selection on traits; (2) consequences favour reciprocal co‐adaptation traits. We discuss our context pre‐copulatory post‐copulatory processes. call future integrating experimental phylogenetic comparative approaches understand evolutionary feedbacks between Overall, studying may be necessary have adapted environments past could persist future.

Язык: Английский

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Chemical signals from eggs facilitate cryptic female choice in humans

Proceedings of the Royal Society B Biological Sciences, Год журнала: 2020, Номер 287(1928), С. 20200805 - 20200805

Опубликована: Июнь 10, 2020

Mate choice can continue after mating via chemical communication between the female reproductive system and sperm. While there is a growing appreciation that females bias sperm use paternity by exerting cryptic for preferred males, we know surprisingly little about mechanisms underlying these post-mating choices. In particular, whether signals released from eggs (chemoattractants) allow to exert favour specific males remains an open question, particularly in species (including humans) where adults exercise pre-mating mate choice. Here, adapt classic dichotomous assay microscopic scale assess gamete-mediated humans. We examined how respond follicular fluid, source of human chemoattractants, either their partner or non-partner when experiencing simultaneous non-simultaneous fluids. report robust evidence under two distinct experimental conditions fluid different consistently differentially attracts males. This chemoattractant-moderated offers avenue independent preference. Indeed, did not reinforce decisions. Our results demonstrate chemoattractants facilitate humans, which opportunity

Язык: Английский

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Evolutionary dynamics of sex‐biased gene expression in a young XY system: insights from the brown alga genus Fucus

New Phytologist, Год журнала: 2023, Номер 238(1), С. 422 - 437

Опубликована: Янв. 4, 2023

Sex-biased gene expression is considered to be an underlying cause of sexually dimorphic traits. Although the nature and degree sex-biased have been well documented in several animal plant systems, far less known about evolution genes more distant eukaryotic groups. Here, we investigate two brown algal dioecious species, Fucus serratus vesiculosus, where male heterogamety (XX/XY) has recently emerged. We find that contrast evolutionary lineages, male-biased do not experience high turnover rates, but instead reveal remarkable conservation bias levels between suggesting their importance sexual differentiation. Genes with consistent were enriched functions related gamete production, along sperm competition include three flagellar proteins under positive selection. present one first reports, outside kingdom, showing display accelerated rates coding sequence compared female-biased or unbiased genes. Our results imply forces affect female differently on structural regulatory levels, resulting unique properties differentially expressed transcripts during reproductive development algae.

Язык: Английский

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Gamete-level immunogenetic incompatibility in humans–towards deeper understanding of fertilization and infertility?

Heredity, Год журнала: 2020, Номер 125(5), С. 281 - 289

Опубликована: Авг. 3, 2020

Язык: Английский

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Effects of ovarian fluid on sperm traits and its implications for cryptic female choice in zebrafish

Behavioral Ecology, Год журнала: 2019, Номер 30(5), С. 1298 - 1305

Опубликована: Май 1, 2019

Abstract In polyandrous mating systems, females maintain the opportunity to bias male fertilization success after in a process known as cryptic female choice. Mechanisms of choice have been described both internal and external fertilizers, may affect processes at different stages before, during, fertilization. substantial control over sperm storage fertilization, whereas is limited. A key factor proposed mediate fluid surrounding eggs, ovarian fluid, it directly performance. Here, we studied role post-mating sexual selection using zebrafish, Danio rerio. Firstly, assessed how affects swimming performance compared with freshwater. We focused on motility, velocity, trajectory, longevity, all traits associated competitive externally fertilizing fish. second step, used North Carolina II design explore female, male, x effects by testing motility 2 males total 11 blocks. Our results indicate that differently from Specifically, longevity were higher than freshwater, linearity beat cross frequency showed opposite pattern. Moreover, these varied according identities, supporting potential for mediated this species.

Язык: Английский

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