The gill-oxygen limitation theory (GOLT) and its critics

Science Advances, Journal Year: 2021, Volume and Issue: 7(2)

Published: Jan. 6, 2021

The gill-oxygen limitation theory (GOLT) explains many previously unexplained aspects of the life history fish.

Language: Английский

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Sexual selection and its evolutionary consequences in female animals

Biological reviews/Biological reviews of the Cambridge Philosophical Society, Journal Year: 2018, Volume and Issue: 94(3), P. 929 - 956

Published: Nov. 28, 2018

ABSTRACT For sexual selection to act on a given sex, there must exist variation in the reproductive success of that sex as result differential access mates or fertilisations. The mechanisms and consequences acting male animals are well documented, but research females has only recently received attention. Controversy still exists over whether acts traditional sense, modify existing definition (to include resource competition) invoke alternative (usually social selection) explain connection with reproduction. However, substantial evidence bearing characters exhibiting behaviours analogous those attributed males. Here we summarise literature provide female intrasexual competition for mates, intersexual signalling potential postcopulatory such between eggs sperm cryptic allocation. Our review makes clear males similar ways sometimes differing extents: ceiling elaboration costly traits may be lower than We predict current future will increasing support parsimony utility selection.

Language: Английский

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Conceptual developments in sperm competition: a very brief synopsis

Philosophical Transactions of the Royal Society B Biological Sciences, Journal Year: 2020, Volume and Issue: 375(1813), P. 20200061 - 20200061

Published: Oct. 18, 2020

The past half century has seen the development of field post-ejaculatory sexual selection, sequel to selection for mate-acquisition (pre-ejaculatory) described by Darwin. In richness and diversity adaptations, rivals that pre-ejaculatory selection. Anisogamy—and hence two sexes—likely arose primeval gamete competition, sperm competition remains a major force maintaining high numbers. equivalent male–male matings, was an intense ancestral form typically weakening as mobility internal fertilization developed in many taxa, when some expenditure became diverted into competition. Sperm theory been relatively successful explaining variation relative testes size numbers per ejaculate is becoming more phenotype. generated other male adaptations such seminal fluid proteins variously modify female reproduction towards interests, copulatory plugs, prolonged copulations guarding behaviour reduce remating probability, which result conflict. This short survey conceptual developments intended broad overview, mainly primer new researchers. article part theme issue ‘Fifty years competition'.

Language: Английский

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Sperm bauplan and function and underlying processes of sperm formation and selection

Physiological Reviews, Journal Year: 2021, Volume and Issue: 102(1), P. 7 - 60

Published: April 21, 2021

The spermatozoon is a highly differentiated and polarized cell, with two main structures: the head, containing haploid nucleus acrosomal exocytotic granule, flagellum, which generates energy propels cell; both structures are connected by neck. sperm’s aim to participate in fertilization, thus activating development. Despite this common bauplan function, there an enormous diversity structure performance of sperm cells. For example, mammalian spermatozoa may exhibit several head patterns overall lengths ranging from ∼30 350 µm. Mechanisms transport female tract, preparation for recognition interaction oocyte also show considerable variation. There has been much interest understanding origin diversity, evolutionary terms relation mechanisms underlying differentiation testis. Here, relationships between function examined at levels: first, analyzing selective forces that drive changes physiology understand adaptive values variation impact on male reproductive success second, examining cellular molecular formation testis explain how can give rise such wide array forms functions.

Language: Английский

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

Nature Ecology & Evolution, Journal Year: 2021, Volume and Issue: 5(8), P. 1153 - 1164

Published: June 21, 2021

Language: Английский

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Meta-analysis shows no consistent evidence for senescence in ejaculate traits across animals

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Jan. 16, 2024

Abstract Male reproductive traits such as ejaculate size and quality, are expected to decline with advancing age due senescence. It is however unclear whether this expectation upheld across taxa. We perform a meta-analysis on 379 studies, quantify the effects of male 157 species non-human animals. Contrary predictions, we find no consistent pattern age-dependent changes in traits. This result partly reflects methodological limitations, studies sampling low proportion adult lifespan, or inability meta-analytical approaches document non-linear ageing trajectories traits; which could potentially lead an underestimation Yet, taxon-specific differences patterns For instance, older males produce less motile slower sperm ray-finned fishes, but larger ejaculates insects, compared younger males. Notably, lab rodents show senescence most measured. Our study challenges notion universal senescence, highlighting need for controlled methodologies more nuanced understanding cognisant biology, experimental design, selection pressures, life-history.

Language: Английский

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Have We Outgrown the Existing Models of Growth?

Trends in Ecology & Evolution, Journal Year: 2018, Volume and Issue: 34(2), P. 102 - 111

Published: Nov. 2, 2018

Language: Английский

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The hidden ageing costs of sperm competition

Ecology Letters, Journal Year: 2020, Volume and Issue: 23(11), P. 1573 - 1588

Published: Sept. 9, 2020

Abstract Ageing and sexual selection are intimately linked. There is by now compelling evidence from studies performed across diverse organisms that males allocating resources to mating competition incur substantial physiological costs, ultimately increasing ageing. However, although insightful, we argue here date these cover only part of the relationship linking Crucially, allocation traits important in post‐copulatory selection, sperm competition, has been largely ignored. As demonstrate, such could potentially explain much diversity male female ageing patterns observed both within among species. We first review how as seminal fluid production depends on quality available can be associated with a wide range deleterious effects affecting somatic tissues germline, thus modulate survival reproductive terms. further hypothesise common biological features plasticity, prudent seasonality ejaculate might have evolved counter‐adaptations limit costs competition. Finally, discuss implications emerging for current research evolutionary ecology

Language: Английский

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The 150th anniversary ofThe Descent of Man: Darwin and the impact of sex-role reversal on sexual selection research

Biological Journal of the Linnean Society, Journal Year: 2021, Volume and Issue: 134(3), P. 525 - 540

Published: June 10, 2021

Abstract The year 2021 marks the 150th anniversary of publication Charles Darwin’s extraordinary book Descent Man and Selection in Relation to Sex. Here, we review history impact a single profound insight from Man: that, some few species, females rather than males compete for access mates. In other words, these species are ‘sex-role reversed’ with respect mating competition sexual selection compared majority which acts most strongly on males. Over subsequent 150 years, sex-role-reversed have motivated multiple key conceptual breakthroughs selection. surprising dynamics such challenged scientists’ preconceptions, forcing them examine implicit assumptions stereotypes. This wider worldview has led richer more nuanced understanding animal systems and, particular, proper appreciation fundamental role that play shaping systems. Sex-role-reversed considerable untapped potential will continue contribute research decades come.

Language: Английский

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Bateman gradients from first principles

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: June 23, 2022

Abstract In 1948, Angus Bateman presented experiments and concepts that remain influential debated in sexual selection. The gradient relates reproductive success to mate number, this as the cause of intra-masculine A deeper causal level was subsequently asserted: ultimate sex differences gradients is difference gamete numbers, an argument remains controversial without mathematical backup. Here I develop models showing how asymmetry numbers alone can generate steeper males. This conclusion when further internal fertilisation added model efficient. Strong limitation push towards equality under external reverse them fertilisation. Thus, study provides a formalisation Bateman’s brief verbal claim, while demonstrating link between number not inevitable nor trivial.

Language: Английский

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