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72 results for “sex reversal”
Data from: Sexual dimorphism in epicuticular compounds despite similar sexual selection in sex role-reversed seed beetles
Sexual selection imposed by mating preferences is often implicated in the evolution of both sexual dimorphism and divergence between species in signalling traits. Epicuticular compounds (ECs) are important signalling traits in insects and show extensive variability among and within taxa. Here, we investigate whether variation in the multivariate EC profiles of two sex role-reversed beetle species, Megabruchidius dorsalis and Megabruchidius tonkineus, predicts mate attractiveness and mating success in males and females. The two species had highly distinct EC profiles and both showed significant sexual dimorphism in ECs. Age and mating status in both species were also distinguishable by EC profile. Males and females of both species showed significant association between their EC profile and attractiveness, measured both as latency to mating and as success in mate-choice trials. Remarkably, the major multivariate vector describing attractiveness was correlated in both species, both sexes, and in both choice and no-choice experiments such that increased attractiveness was in all cases associated with a similar multivariate modification of EC composition. Furthermore, in both sexes this vector of attractiveness was associated with more male-like EC profiles, as well as those characterizing younger and nonvirgin individuals, which might reflect a general preference for individuals of high condition in both sexes. Despite significant sexual selection on EC composition, however, we found no support for the proposition that sexual selection is responsible for divergence in ECs between these species.
sex reversal transcriptomic analysis in Chinese tongue sole
<p>sex reseveral transcriptome data</p>
Data from: Sex ratio and density affect sexual selection in a sex-role reversed fish
Understanding how demographic processes influence mating systems is important to decode ecological influences on sexual selection in nature. We manipulated sex ratio and density in experimental populations of the sex-role reversed pipefish Syngnathus typhle. We quantified sexual selection using the Bateman gradient (ß′ss), the opportunity for selection (I), and sexual selection (Is), and the maximum standardized sexual selection differential (s′max). We also measured selection on body length using standardized selection differentials (s′) and mating differentials (m′), and tested whether the observed I and Is differ from values obtained by simulating random mating. We found that I, Is, and s′max, but not ß′ss, were higher for females under female- than male-bias and the opposite for males, but density did not affect these measures. However, higher density decreased sexual selection (m′ but not s′) on female length, but selection on body length was not affected by sex ratio. Finally, Is but not I was higher than expected from random mating, and only for females under female bias. This study demonstrates that both sex ratio and density affect sexual selection and that disentangling interrelated demographic processes is essential to a more complete understanding of mating behavior and the evolution of mating systems.
Data from: The behavioural consequences of sex reversal in dragons
Sex differences in morphology, physiology, and behaviour are caused by sex-linked genes, as well as by circulating sex-steroid levels. Thus, a shift from genotypic to environmental sex determination may create an organism that exhibits a mixture of male-like and female-like traits. We studied a lizard species (Central Bearded Dragon, Pogona vitticeps), in which the high-temperature incubation of eggs transforms genetically male individuals into functional females. Although they are reproductively female, sex-reversed dragons (individuals with ZZ genotype reversed to female phenotype) resemble genetic males rather than females in morphology (relative tail length), general behaviour (boldness and activity level), and thermoregulatory tactics. Indeed, sex-reversed 'females' are more male-like in some behavioural traits than are genetic males. This novel phenotype may impose strong selection on the frequency of sex reversal within natural populations, facilitating rapid shifts in sex-determining systems. A single period of high incubation temperatures (generating thermally induced sex reversal) can produce functionally female individuals with male-like (or novel) traits that enhance individual fitness, allowing the new temperature-dependent sex-determining system to rapidly replace the previous genetically based one.
Data from: Sexual selection on female ornaments in the sex-role-reversed Gulf pipefish (Syngnathus scovelli)
Understanding how selection acts on traits individually and in combination is an important step in deciphering the mechanisms driving evolutionary change, but for most species, and especially those in which sexual selection acts more strongly on females than on males, we have no estimates of selection coefficients pertaining to the multivariate sexually selected phenotype. Here, we use a laboratory-based mesocosm experiment to quantify pre- and post-mating selection on female secondary sexual traits in the Gulf pipefish (Syngnathus scovelli), a sexually dimorphic, sex-role-reversed species in which ornamented females compete for access to choosy males. We calculate selection differentials and gradients on female traits, including ornament area, ornament number and body size for three episodes of selection related to female reproductive success (number of mates, number of eggs transferred and number of surviving embryos). Selection is strong on both ornament area and ornament size, and the majority of selection occurs during the premating episode of selection. Interestingly, selection on female body size, which has been detected in previous studies of Gulf pipefish, appears to be indirect, as evidenced by a multivariate analysis of selection gradients. Our results show that sexual selection favours either many bands or larger bands in female Gulf pipefish.
Figure 1 in Prolonged parental behaviour by males of Limnonectes palavanensis (Boulenger 1894), a frog with possible sex-role reversal
Figure 1. Male of Limnonectes palavanensis attending a clutch of eggs.
Figure 5. A in Prolonged parental behaviour by males of Limnonectes palavanensis (Boulenger 1894), a frog with possible sex-role reversal
Figure 5. A male (striped morph) Limnonectes palavanensis transporting tadpoles on his back.
Data from: Variant files for genotypic and sex-reversed males
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Data from: Sex ratio and density affect sexual selection in a sex-role reversed fish
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Data from: Sperm competition generates evolution of increased paternal investment in a sex role-reversed seed beetle
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Data from: The behavioural consequences of sex reversal in dragons
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Data from: Sex reversal and primary sex ratios in the common frog (Rana temporaria)
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Data from: Neuroendocrine correlates of sex-role reversal in barred buttonquails
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Data from: Sexual selection on female ornaments in the sex-role-reversed Gulf pipefish (Syngnathus scovelli)
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Data from: Sexual dimorphism in epicuticular compounds despite similar sexual selection in sex role-reversed seed beetles
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Transcriptomic characterization of transcription activator-like effector nucleases-induced XY dmy- sex reversal female medaka (Oryzias latipes)
GEO Series GSE62700. Oryzias latipes. 3 samples. Type: Expression profiling by high throughput sequencing.
Transcriptome analysis during sex reversal in Monopterus albus
GEO Series GSE311816. Monopterus albus. 22 samples. Type: Expression profiling by high throughput sequencing.
Strain differences in e11.5 XY gonad transcriptome suggest a mechanism for the sensitivity of C57BL/6J to sex reversal
GEO Series GSE16917. Mus musculus. 20 samples. Type: Expression profiling by array.
Sox9 duplications cause Sry-negative XX sex-reversal in dogs
GEO Series GSE57137. Canis lupus familiaris. 7 samples. Type: Genome variation profiling by genome tiling array.
Gonadal sex reversal at single-cell resolution in Znrf3-deficient mice
GEO Series GSE280999. Mus musculus. 35 samples. Type: Expression profiling by high throughput sequencing.
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
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