The relationship between sexual selection and speciation

Servedio, Maria R.

doi:10.1093/czoolo/58.3.413

Cited by 7 publications

(3 citation statements)

References 23 publications

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“…Most research on magic traits has hitherto focused on traits contributing to male mating signals and female preference for these signals [ 4 , 8 ]. While convincing in specific cases [ 11 , 13 ], the current consensus is that magic traits are unlikely to be widespread. Thus, the novel molecular mechanisms associated with egg hydration and adhesiveness, which we have elucidated in this study, may represent new examples of “magic traits” that underpin the adaptive radiation of endemic East Asian cyprinids.…”

Section: Discussionmentioning

confidence: 99%

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Molecular Mechanisms of Spawning Habits for the Adaptive Radiation of Endemic East Asian Cyprinid Fishes

Chen

Wang

et al. 2022

Research

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Despite the widespread recognition of adaptive radiation as a driver of speciation, the mechanisms by which natural selection generates new species are incompletely understood. The evolutionary radiation of endemic East Asian cyprinids has been proposed as evolving through a change in spawning habits, involving a transition from semibuoyant eggs to adhesive eggs in response to crosslinked river-lake system formation. Here, we investigated the molecular mechanisms that underpin this radiation, associated with egg hydration and adhesiveness. We demonstrated that semibuoyant eggs enhance hydration by increasing the degradation of yolk protein and accumulation of Ca2+ and Mg2+ ions, while adhesive eggs improve adhesiveness and hardness of the egg envelope by producing an adhesive layer and a unique 4th layer to the egg envelope. Based on multiomics analyses and verification tests, we showed that during the process of adaptive radiation, adhesive eggs downregulated the “vitellogenin degradation pathway,” “zinc metalloprotease pathway,” and “ubiquitin-proteasome pathway” and the pathways of Ca2+ and Mg2+ active transport to reduce their hydration. At the same time, adhesive eggs upregulated the crosslinks of microfilament-associated proteins and adhesive-related proteins, the hardening-related proteins of the egg envelope, and the biosynthesis of glycosaminoglycan in the ovary to generate adhesiveness. These findings illustrate the novel molecular mechanisms associated with hydration and adhesiveness of freshwater fish eggs and identify critical molecular mechanisms involved in the adaptive radiation of endemic East Asian cyprinids. We propose that these key egg attributes may function as “magic traits” in this adaptive radiation.

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Section: Discussionmentioning

confidence: 99%

“…Termed “magic traits,” these may be the key to understanding how ecological speciation can be accomplished despite on-going, limited gene flow. Here, an underlying set of genes simultaneously controls both divergent adaptation and nonrandom mating [ 11 , 12 ], potentially driving rapid diversification [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Molecular Mechanisms of Spawning Habits for the Adaptive Radiation of Endemic East Asian Cyprinid Fishes

Chen

Wang

et al. 2022

Research

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“…Compared with sexual monomorphic species, sexual dichromatic species might be exposed to a greater selection, namely Fisherian sexual selection, which plays an important role in driving population divergence as an essential driver of pre-zygotic isolation. However, there are only some theoretical researches based on model simulation (Servedio 2012;Servedio and Bürger 2014;Servedio 2016) for the pattern and role of gene flow in speciation under Fisherian sexual selection (but see Dong et al 2013 for a case study in birds). More empirical researches are still needed to support theoretical expectations.…”

Section: Introductionmentioning

confidence: 99%

Parapatric speciation with recurrent gene flow of two sexual dichromatic pheasants

Zhou

Gao

et al. 2021

Preprint

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BackgroundUnderstanding speciation has long been a fundamental goal of evolutionary biology. It is widely accepted that speciation requires an interruption of gene flow to generate strong reproductive isolation between species, in which sexual selection may play an important role by generating and maintaining sexual dimorphism. The mechanism of how sexual selection operated in speciation with gene flow remains an open question and the subject of many research. Two species in genus Chrysolophus, Golden pheasant (C. pictus) and Lady Amherst’s pheasant (C. amherstiae), which both exhibit significant plumage dichromatism, are currently parapatric in the southwest China with several hybrid recordings in field.MethodsIn this research, we estimated the pattern of gene flow during the speciation of two pheasants using the Approximate Bayesian Computation (ABC) method based on the multiple genes data. With a new assembled de novo genome of Lady Amherst’s pheasant and resequencing of widely distributed individuals, we reconstructed the demographic history of the two pheasants by pairwise sequentially Markovian coalescent (PSMC).ResultsThe results provide clear evidence that the gene flow between the two pheasants were consistent with the prediction of isolation with migration model for allopatric populations, indicating that there was long-term gene flow after the initially divergence (ca. 2.2 million years ago), and further support the secondary contact when included the parapatric populations since around 30 ka ongoing gene flow to now, which might be induced by the population expansion of the Golden pheasant in late Pleistocene.ConclusionsThe results of the study support the scenario of speciation between Golden pheasant (C. pictus) and Lady Amherst’s pheasant (C. amherstiae) with cycles of mixing-isolation-mixing due to the dynamics of natural selection and sexual selection in late Pleistocene that provide a good research system as evolutionary model to test reinforcement selection in speciation.

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The dominance of seismic signaling and selection for signal complexity in Schizocosa multimodal courtship displays

Hebets

Vink

Sullivan-Beckers

et al. 2013

Behav Ecol Sociobiol

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The relationship between sexual selection and speciation

Cited by 7 publications

References 23 publications

Molecular Mechanisms of Spawning Habits for the Adaptive Radiation of Endemic East Asian Cyprinid Fishes

Molecular Mechanisms of Spawning Habits for the Adaptive Radiation of Endemic East Asian Cyprinid Fishes

Parapatric speciation with recurrent gene flow of two sexual dichromatic pheasants

The dominance of seismic signaling and selection for signal complexity in Schizocosa multimodal courtship displays

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