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303 results for “Sex ratio”
Data from: Are human natal sex ratio differences across the world adaptive? A test of Fisher’s principle
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Poa arachnifera demography and sex ratio surveys
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Data for: Female-biased sex ratios in urban centres create a fertility trap in post war Finland
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Data from: Persistent sex-by-environment effects on offspring fitness and sex-ratio adjustment in a wild bird population
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Data from: Multi-generational response to artificial selection for biased clutch sex ratios in Tigriopus californicus populations
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Data from: Effects of parasitic sex-ratio distorters on host genetic structure in the Armadillidium vulgare-Wolbachia association
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Data from: Female density-dependent chemical warfare underlies fitness effects of group sex ratio in flour beetles
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Data from: Sperm competitive ability evolves in response to experimental alteration of operational sex ratio
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Data from: Evolutionary stable sex ratios with non-facultative male-eggs first sex allocation in fig wasps
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Data from: Male spiders control offspring sex ratio through greater production of female-determining sperm
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Data from: Sex ratio at mating does not modulate age fitness effects in D. melanogaster
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Data from: A method for estimating population sex ratio for sage-grouse using noninvasive genetic samples
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Data from: Sex ratio of Western Bluebirds Sialia mexicana is mediated by phenology and clutch size
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Male mice lacking Teshl lncRNA exhibit inactivation of Y chromosomal multicopy genes and female distortion-biased sex ratio change in offspring
GEO Series GSE162652. Mus musculus. 6 samples. Type: Expression profiling by high throughput sequencing.
Data from: Sex ratio variation shapes the ecological effects of a globally introduced freshwater fish
Sex ratio and sexual dimorphism have long been of interest in population and evolutionary ecology, but consequences for communities and ecosystems remain untested. Sex ratio could influence ecological conditions whenever sexual dimorphism is associated with ecological dimorphism in species with strong ecological interactions. We tested for ecological implications of sex ratio variation in the sexually dimorphic western mosquitofish, Gambusia affinis. This species causes strong pelagic trophic cascades and exhibits substantial variation in adult sex ratios. We found that female-biased populations induced stronger pelagic trophic cascades compared with male-biased populations, causing larger changes to key community and ecosystem responses, including zooplankton abundance, phytoplankton abundance, productivity, pH and temperature. The magnitude of such effects indicates that sex ratio is important for mediating the ecological role of mosquitofish. Because both sex ratio variation and sexual dimorphism are common features of natural populations, our findings should encourage broader consideration of the ecological significance of sex ratio variation in nature, including the relative contributions of various sexually dimorphic traits to these effects.
Data from: Superparasitism drives heritable symbiont epidemiology and host sex ratio in a wasp
Heritable microbial symbionts have profound impacts upon the biology of their arthropod hosts. Whilst our current understanding of the dynamics of these symbionts is typically cast within a framework of vertical transmission only, horizontal transmission has been observed in a number of cases. For instance, several symbionts can transmit horizontally when their parasitoid hosts share oviposition patches with uninfected conspecifics, a phenomenon called superparasitism. Despite this, horizontal transmission, and the host contact structures that facilitates it, have not been considered in heritable symbiont epidemiology. Here, we tested for the importance of host contact, and resulting horizontal transmission, for the epidemiology of a male-killing heritable symbiont (Arsenophonus nasoniae) in parasitoid wasp hosts. We observed that host contact through superparasitism is necessary for this symbiont's spread in populations of its primary host Nasonia vitripennis, such that when superparasitism rates are high, A. nasoniae almost reaches fixation, causes highly female biased population sex ratios and consequently causes local host extinction. We further tested if natural interspecific variation in superparasitism behaviours predicted symbiont dynamics among parasitoid species. We found that A. nasoniae was maintained in laboratory populations of a closely related set of Nasonia species, but declined in other, more distantly related pteromalid hosts. The natural proclivity of a species to superparasitise was the primary factor determining symbiont persistence. Our results thus indicate that host contact behaviour is a key factor for heritable microbe dynamics when horizontal transmission is possible, and that 'reproductive parasite' phenotypes, such as male-killing, may be of secondary importance in the dynamics of such symbiont infections.
Figure 1 in Sex ratio, oocyte development and spawning season of Mediterranean moray eel (Muraena helena) from the northern coast of Tunisia
Figure 1. – Muraena helena sampling area.
Effects of Male-specific Antibodies on Sex Ratio
ClinicalTrials.gov study NCT02267252. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Data from: Sex ratio variation shapes the ecological effects of a globally introduced freshwater fish
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Data from: Superparasitism drives heritable symbiont epidemiology and host sex ratio in a wasp
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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.