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| Open AccessThe molecular evolution of spermatogenesis across mammals
Evolutionary analyses of single-nucleus transcriptome data for testes from 11 species are reported, illuminating the molecular evolution of spermatogenesis and associated forces, and providing a resource for investigating the testis across mammals.
- Florent Murat
- , Noe Mbengue
- & Henrik Kaessmann
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Article |
Reduced reproductive success is associated with selective constraint on human genes
Human genetic variants that impair genes that are intolerant of damaging genetic variation are associated with lower reproductive success that is probably mediated by genetically associated cognitive and behavioural traits, particularly in males.
- Eugene J. Gardner
- , Matthew D. C. Neville
- & Matthew E. Hurles
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Letter |
Imprinting sets the stage for speciation
Tadpoles of strawberry poison frogs (Oophaga pumilio) are shown to imprint on adult coloration, affecting both male aggression biases and female preferences and setting the stage for speciation by sexual selection.
- Yusan Yang
- , Maria R. Servedio
- & Corinne L. Richards-Zawacki
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Letter |
Mating preferences of selfish sex chromosomes
Population genetic modelling shows that mate preferences encoded on sex chromosomes can drive the evolution of extremely male-costly traits.
- Pavitra Muralidhar
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Letter |
High male sexual investment as a driver of extinction in fossil ostracods
Ostracod species (small, bivalved crustaceans) with high sexual dimorphism, and therefore high male investment, had markedly higher extinction rates than low-investment species, indicating that sexual selection can be a substantial risk factor for extinction.
- Maria João Fernandes Martins
- , T. Markham Puckett
- & Gene Hunt
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Letter |
Breeding site sampling across the Arctic by individual males of a polygynous shorebird
Nomadic movement across the breeding range enables male pectoral sandpipers to display and sire offspring at multiple sites within a single breeding season, with tenure depending on breeding female numbers at each site.
- Bart Kempenaers
- & Mihai Valcu
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Letter |
How sexual selection can drive the evolution of costly sperm ornamentation
The ‘big-sperm paradox’, the observed production of few, gigantic sperm by some fruit flies (seemingly at odds with fundamental theory addressing how sexual selection works) is shown to be a result of co-evolution driven by genetic and functional relationships between sperm length, design of the female reproductive tract and features of the mating system.
- Stefan Lüpold
- , Mollie K. Manier
- & Scott Pitnick
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Letter |
Competitive growth in a cooperative mammal
In wild Kalahari meerkats (Suricata suricatta), subordinates of both sexes respond to experimentally induced increases in the growth of same-sex rivals by raising their own growth rate and food intake.
- Elise Huchard
- , Sinead English
- & Tim Clutton-Brock
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Letter |
The effects of life history and sexual selection on male and female plumage colouration
By quantifying the colouration of all approximately 6,000 species of passerine birds, certain life-history traits such as large body size and tropical distribution are found to increase ornamentation in both male and female birds, whereas cooperative breeding increases it in females only, and sexual selection diminishes it in females more than it increases it in males.
- James Dale
- , Cody J. Dey
- & Mihai Valcu
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Letter |
Sexual selection protects against extinction
Populations of the flour beetle Tribolium castaneum with histories of strong versus weak sexual selection purge mutation load and resist extinction differently.
- Alyson J. Lumley
- , Łukasz Michalczyk
- & Matthew J. G. Gage
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Letter |
The evolution of the placenta drives a shift in sexual selection in livebearing fish
In poeciliid fish, the evolution of the placenta is associated with polyandry in females and correlates with a suite of phenotypic and behavioural traits in males.
- B. J. A. Pollux
- , R. W. Meredith
- & D. N. Reznick
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Letter |
Mating advantage for rare males in wild guppy populations
Manipulation of the frequency of naturally occurring colour patterns within replicate pools of fish at three sites shows that males with rare colour patterns have higher reproductive fitness, demonstrating negative frequency-dependent selection mediated by sexual selection.
- Kimberly A. Hughes
- , Anne E. Houde
- & F. Helen Rodd
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Letter |
Life history trade-offs at a single locus maintain sexually selected genetic variation
Wild Soay sheep rams with large horns have more offspring, yet there is considerable genetic variation at RXFP2, a locus strongly implicated in horn size (with different alleles conferring either large or small horns); this study finds that although the larger horn allele leads to more offspring, the smaller horn allele leads to increased survival, meaning heterozygous rams (which develop medium-sized horns) have high reproductive success and survival, providing a rare example of heterozygote advantage.
- Susan E. Johnston
- , Jacob Gratten
- & Jon Slate
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Letter |
Ecological opportunity and sexual selection together predict adaptive radiation
Adaptive radiation of cichlid fishes in the African Great Lakes is predictable, but only when species traits and environmental factors are jointly considered.
- Catherine E. Wagner
- , Luke J. Harmon
- & Ole Seehausen
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Letter |
Sexual selection enables long-term coexistence despite ecological equivalence
A theoretical model shows how sexual selection, on its own, can maintain biodiversity, provided that two realistic assumptions are met: that carrying capacity varies spatially, and that females searching for mates incur costs in doing so.
- Leithen K. M’Gonigle
- , Rupert Mazzucco
- & Ulf Dieckmann
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News |
Size doesn't always matter for peacocks
Peahens don't necessarily choose the males with the biggest tails — but small tails are right out.
- Ewen Callaway
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News |
Bacteria can drive the evolution of new species
Symbiotic organisms influence fruitfly mate choice.
- Joseph Milton
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Letter |
Higher rates of sex evolve in spatially heterogeneous environments
Direct experimental tests of the conditions under which sex evolves have been rare. These authors evolve populations of a facultatively sexual rotifer in homogeneous and heterogeneous environments and show that the latter promotes sex.
- Lutz Becks
- & Aneil F. Agrawal
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Research Highlights |
Sexual selection: Networking for mates
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News |
Evolutionary insights caught on camera
Spying on wild crickets in the field yields secrets of reproductive success.
- Janelle Weaver
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Letter |
Post-copulatory sexual selection and sexual conflict in the evolution of male pregnancy
Male pregnancy is restricted to seahorses, pipefishes and their relatives, in which young are nurtured in the male's brood pouch. It is now clear that the brood pouch has a further function. Studies of Gulf pipefish show that males can selectively abort embryos from females perceived as less attractive, saving resources for more hopeful prospects later. This is the only known example of post-copulatory sexual conflict in a sex-reversed species.
- Kimberly A. Paczolt
- & Adam G. Jones
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News |
Male pipefish abort embryos of ugly mothers
Males show sexual selection before and after copulation.
- Janet Fang