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72 results for “sex reversal”
Hormone profiles of the African pygmy mouse Mus minutoides, a species with XY female sex reversal.
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Figure 4 in Prolonged parental behaviour by males of Limnonectes palavanensis (Boulenger 1894), a frog with possible sex-role reversal
Figure 4. Climbing behaviour of the tadpoles of L. palavanensis. (a) The male stimulates hatching by touching the eggs with its chin and fingers. (b) The male positions himself on top of the eggs and twitches his abdomen and fingers. (c) He steps on the eggs, breaking the egg capsule and separating them. (d) The first tadpole starts climbing (indicated by the arrow). The male sits on top of the now free tadpoles and waits for them to climb. (e) The male starts to turn around while the tadpoles wriggle onto his back. After every turn he remains still for a few seconds while the tadpoles climb. (f) The tadpoles move around and rearrange themselves while the last tadpole makes it to the top.
Figure 2 in Prolonged parental behaviour by males of Limnonectes palavanensis (Boulenger 1894), a frog with possible sex-role reversal
Figure 2. Abandoned clutch of Limnonectes palavanensis. (a) Abandoned clutch of 14 eggs; note the formation of the animal pole (darkened area). (b) The clutch continued its normal development (7 days old). Two eggs did not develop (yellow arrows) and one egg stopped developing after day five (black arrow). The tadpoles hatched on their own after nine days.
Figure 3 in Prolonged parental behaviour by males of Limnonectes palavanensis (Boulenger 1894), a frog with possible sex-role reversal
Figure 3. Embryonic development of the eggs of L. palavanensis. (a) The vegetal pole differentiates from the animal pole 24 h after fertilisation. (b) Neural folds develop, Gosner stage 15 (3 days old). (c) The head forms and the tail elongates around the yolk sac, Gosner stages 18–19 (4 days old). (d) Eyes become apparent and external gills are visible, Gosner stages 21–22 (6 days old). (e) The tadpoles are now sensitive to light, the eyes are completely formed and the gills are not visible anymore, Gosner stages 24–25 (9 days old). (f) The tadpoles are ready to hatch (10 days old).
Figure 1 in Sexual dimorphism in chelicerae, forelegs and palpal traits in two burrowing wolf spiders (Araneae: Lycosidae) with sex-role reversal
Figure 1. Dimorphism in chelicerae pigmentation (frontal views). Males (A, C) show darker pigmentation than females (B, D) in both species: Allocosa brasiliensis (above) and Allocosa alticeps (below).
Figure 3 in Sexual dimorphism in chelicerae, forelegs and palpal traits in two burrowing wolf spiders (Araneae: Lycosidae) with sex-role reversal
Figure 3. Palpal tarsi (lateral views) of Aglaoctenus lagotis (A,B) and Schizocosa malitiosa (C,D), showing female claws (A,C), and male palpal tarsus without claws or specialized structures on distal position (B,D).
Figure 2 in Sexual dimorphism in chelicerae, forelegs and palpal traits in two burrowing wolf spiders (Araneae: Lycosidae) with sex-role reversal
Figure 2. Palpal claws (lateral views) (A) female of Allocosa alticeps; (B) juvenile of Allocosa alticeps; and apical modifications of palpal tarsi (C) adult male of Allocosa brasiliensis (ventrolateral view); (D) adult male of Allocosa brasiliensis (dorsal view); (E) penultimate male of Allocosa brasiliensis (ventrolateral view); (F) penultimate male of Allocosa brasiliensis (dorsal view).
Unexpected degrees of male courtship in a highly sexually dimorphic sex-role reversed species: raw data
<p>This repository contains the behavioural data collected from video recordings of 10 mesocosms containing *S. nigra* males and females (which were run in 2020-2021). The goals of the study are to:</p> <p>1. Describe the courtship behaviours of these sexually dimorphic fish<br> 2. Establish whether one sex is more active in courtship than the other<br> 3. Determine factors the influence sex-specific behaviours</p> <p>The data provided here are in two zipped directories: Chase_datasheets/ and BORIS_data/. Both contain data from analysis of videos in BORIS. The BORIS_data/ contains the majority of the courtship behaviours, but the videos were re-analysed to investigate chase behaviours after the courtship behaviours were scored. The chase behaviour data is in Chase_datasheets/.</p>
Data from: Population genetic structure and direct observations reveal sex-reversed patterns of dispersal in a cooperative bird
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Evolving thermal thresholds explain the distribution of temperature sex reversal in an Australian dragon lizard
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Data from: Starvation causes female to male sex reversal through lipid metabolism in the teleost fish, medaka (Oryzias latipes)
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Data from: Female ornamentation and the fecundity trade-off in a sex-role reversed pipefish
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Data from: The contributions of premating and postmating selection episodes to total selection in sex-role-reversed Gulf pipefish
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Climate change, sex reversal, and lability of sex determining systems
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Data from: No evidence for size-assortative mating in the wild despite mutual mate choice in sex-role-reversed pipefishes
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Data from: New locus reveals the genetic architecture of sex reversal in the Chinese tongue sole (Cynoglossus semilaevis)
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Data from: Individual heterogeneity determines sex differences in mortality in a monogamous bird with reversed sexual dimorphism
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Data from: The effects of synthetic estrogen exposure on pre-mating and post-mating episodes of selection in sex-role-reversed Gulf pipefish
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Data from: Variant files for genotypic and sex-reversed males
<p>X and Y chromosomes are usually derived from a pair of homologous autosomes, which then diverge from each other over time. Although Y-specific features have been characterized in sex chromosomes of various ages, the earliest stages of Y chromosome evolution remain elusive. In particular, we do not know whether early stages of Y chromosome evolution consist of changes to individual genes or happen via chromosome-scale divergence from the X. To address this question, we quantified divergence between young proto-X and proto-Y chromosomes in the house fly, <i>Musca domestica</i>. We compared proto-sex chromosome sequence and gene expression between genotypic (XY) and sex-reversed (XX) males. We find evidence for sequence divergence between genes on the proto-X and proto-Y, including five genes with mitochondrial functions. There is also an excess of genes with divergent expression between the proto-X and proto-Y, but the number of genes is small. This suggests that individual proto-Y genes, but not the entire proto-Y chromosome, have diverged from the proto-X. We identified one gene, encoding an axonemal dynein assembly factor (which functions in sperm motility), that has higher expression in XY males than XX males because of a disproportionate contribution of the proto-Y allele to gene expression. The up-regulation of the proto-Y allele may be favored in males because of this gene's function in spermatogenesis. The evolutionary divergence between proto-X and proto-Y copies of this gene, as well as the mitochondrial genes, is consistent with selection in males affecting the evolution of individual genes during early Y chromosome evolution.</p>
Data from: Neuroendocrine correlates of sex-role reversal in barred buttonquails
Sex differences in brain structure and behaviour are well documented among vertebrates. An excellent model exploring the neural mechanisms of sex differences in behaviour is represented by sex-role-reversed species. In the majority of bird species, males compete over access to mates and resources more strongly than do females. It is thought that the responsible brain regions are therefore more developed in males than in females. Because these behaviours and brain regions are activated by androgens, males usually have increased testosterone levels during breeding. Therefore, in species with sex-role reversal, certain areas of the female brain should be more developed or steroid hormone profiles should be sexually reversed. Here, I studied circulating hormone levels and gene expression of steroid hormone receptors and aromatase in a captive population of barred buttonquails (Turnix suscitator). While females performed courtship and agonistic behaviours, there was no evidence for sexually reversed hormone profiles. However, I found female-biased sex differences in gene expression of androgen receptors in several hypothalamic and limbic brain regions that were already in place at hatching. Such sex differences are not known from non-sex-role-reversed species. These data suggest that increased neural sensitivity to androgens could be involved in the mechanisms mediating sex-role-reversed behaviours.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
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
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.