Mate Choice, Mating Systems, and Sexual Selection

Møller, Anders Pape

doi:10.1002/9781119109556.ch12

Cited by 4 publications

(2 citation statements)

References 79 publications

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“…These traits are particularly interesting because they often experience conflicting selective pressures from sexual selection and natural selection. Theory posits that in species where males experience stronger sexual selection, large, ornamented males tend to be preferred by females and have higher fitness as a result of greater mating opportunities (Shuster & Wade, 2003; Møller, 2021; Rosenthal, 2017). However, the same ornaments that improve mating success can also reduce the probability of survival, often though an increase in the risk of predation (Hernandez-Jimenez & Rios-Cardenas, 2012; Okada et al ., 2021); although other mechanisms exist (McKean & Nunney, 2008; McNamara et al ., 2013; Moore et al ., 2021).…”

Section: Introductionmentioning

confidence: 99%

Recurrent evolution of small body size and loss of the sword ornament in Northern Swordtail fish

Preising

Gunn

Baczenas

et al. 2022

Preprint

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Across the tree of life, species have repeatedly evolved similar phenotypes. While well-studied for ecological traits, there is also evidence for convergent evolution of sexually selected traits. Swordtail fish (Xiphophorus) are a classic model system for studying sexual selection, and female Xiphophorus exhibit strong mate preferences for large male body size and a range of sexually dimorphic ornaments. However, sexually selected traits have been lost multiple times in the genus. Phylogenetic relationships between species in this group have historically been controversial, likely as a result of prevalent gene flow, resulting in uncertainty over the number of losses of ornamentation and large body size. Here, we use whole-genome sequencing approaches to re-examine phylogenetic relationships within a Xiphophorus clade that varies in the presence and absence of sexually selected traits. Using wild-caught individuals, we determine the phylogenetic placement of a small, unornamented species, X. continens, confirming an additional loss of ornamentation and large body size in the clade. With these revised phylogenetic relationships, we analyze evidence for coevolution between body size and other sexually selected traits using a phylogenetically independent contrasts approach. These results provide insights into the evolutionary pressures driving the recurrent loss of suites of sexually selected traits.

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Section: Introductionmentioning

confidence: 99%

Recurrent evolution of small body size and loss of the sword ornament in Northern Swordtail fish

Preising

Gunn

Baczenas

et al. 2022

Preprint

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“…It has also been proposed that context-dependent learning by itself can influence the predicted evolutionary outcome 13 . Thus, sex-specific evolutionary drives might be in tension with decision-making processes when facing an environmental cue 14,15 . While a significant portion of sex differences in behavior could be attributed to the neurochemical pathway of circulating sex hormones, it has been suggested that behavior is also influenced by other factors, such as life history and sex-specific gene expression 16 .…”

Section: Main Textmentioning

confidence: 99%

Modulation by NPYR underlies experience-dependent, sexually dimorphic learning

Peedikayil-Kurien,

Haque,

Gat

et al. 2023

Preprint

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The evolutionary paths taken by each sex within a given species sometimes diverge, resulting in behavioral differences that promote specific fitness outcomes for each sex. Given their distinct needs, the mechanism by which each sex learns from a shared experience is still an open question. We reveal a novel sexual dimorphism in learning: C. elegans males do not learn to avoid the pathogenic bacteria PA14 as efficiently and rapidly as hermaphrodites, even though their innate immunity recognizes the pathogen in a similar manner. Notably, we observe sexually dimorphic neuronal activity following pathogen exposure: hermaphrodites generate robust representations while males, in line with their behavior, exhibit contrasting representations, suggesting that a mechanism that modulates incoming sensory cues is at play. Transcriptomic and behavioral analysis revealed that the neuropeptide receptor npr-5, an ortholog of the mammalian NPY receptor, regulates male learning by modulating neuronal activity. Furthermore, we show the dependency of the males decision-making phenotype on their sexual status and demonstrate the pivotal role of npr-5 in this regulation as a sensory gatekeeper. Thus, collectively, we portray sex-specific plasticity in behavior toward a shared experience by modulating learning to fulfill the evolutionary needs.

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Recurrent evolution of small body size and loss of the sword ornament in Northern swordtail fish

Preising,

Gunn,

Baczenas

et al. 2024

Evolution

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Across the tree of life, species have repeatedly evolved similar phenotypes. While well-studied for ecological traits, there is also evidence for recurrent evolution of sexually selected traits. Swordtail fish (Xiphophorus) is a classic model system for studying sexual selection, and female Xiphophorus exhibit strong mate preferences for large male body sizes and a range of sexually dimorphic ornaments. Interestingly, sexually selected traits have also been lost multiple times in the genus. However, there has been uncertainty over the number of losses of ornamentation and large body size because phylogenetic relationships between species in this group have historically been controversial, partially due to prevalent gene flow. Here, we use whole-genome sequencing approaches to reexamine phylogenetic relationships within a Xiphophorus clade that varies in the presence and absence of sexually selected traits. Using wild-caught individuals, we determine the phylogenetic placement of a small, unornamented species, X. continens, confirming an additional loss of ornamentation and large body size in the clade. With these revised phylogenetic relationships, we analyze evidence for coevolution between body size and other sexually selected traits using phylogenetic comparative methods. These results provide insights into the evolutionary pressures driving the recurrent loss of suites of sexually selected traits.

show abstract

Mate Choice, Mating Systems, and Sexual Selection

Cited by 4 publications

References 79 publications

Recurrent evolution of small body size and loss of the sword ornament in Northern Swordtail fish

Recurrent evolution of small body size and loss of the sword ornament in Northern Swordtail fish

Modulation by NPYR underlies experience-dependent, sexually dimorphic learning

Recurrent evolution of small body size and loss of the sword ornament in Northern swordtail fish

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