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374 results for “Selection: natural”
Data from: Do chromosome rearrangements fix by genetic drift or natural selection? Insights from Brenthis butterflies
<p>Large-scale chromosome rearrangements, such as fissions and fusions, are a common feature of eukaryote evolution. They can have considerable influence on the evolution of populations, yet it remains unclear exactly how rearrangements become established and eventually fix. Rearrangements could fix by genetic drift if they are weakly deleterious or neutral, or they may instead be favoured by positive natural selection. Here we compare genome assemblies of three closely related <em>Brenthis</em> butterfly species and characterise a complex history of fission and fusion rearrangements. An inferred demographic history of these species suggests that rearrangements became fixed in populations with large long-term effective size (<em>N<sub>e</sub></em>). However, we also find large runs of homozygosity within individual genomes and show that a model of population structure with smaller local <em>N<sub>e</sub></em> can reconcile these observations. Using a recently developed analytic framework for characterising hard selective sweeps, we find that chromosome fusions are not enriched for evidence of past sweeps compared to other regions of the genome. Nonetheless, one chromosome fusion in the <em>B. daphne</em> genome is associated with a valley of diversity where genealogical branch lengths are distorted, consistent with a selective sweep. Our results suggest that drift is a stronger force in these populations than suggested by overall genetic diversity, but that the fixation of strongly underdominant rearrangements remains unlikely. Additionally, although chromosome fusions do not typically exhibit signatures of selective sweeps, a single example raises the possibility that natural selection may sometimes play a role in their fixation.</p>
Areas of low natural regeneration potential post-fire in shrublands of southern California (selected years between 2008 and 2020)
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Using ecological context to interpret spatiotemporal variation in natural selection
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Data from: Climate change shifts natural selection and the adaptive potential of the perennial forb Boechera stricta in the Rocky Mountains
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Climate change does not equally affect temporal patterns of natural selection on reproductive timing across populations in two songbird species
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Data from: A hurricane alters pollinator relationships and natural selection on an introduced island plant
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Data from: Population genomics of rapid evolution in natural populations: polygenic selection in response to power station thermal effluents
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Ecological causes of fluctuating natural selection on habitat choice in an amphibian
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Data from: Personality variation in a marine snail and heterogeneous selection in natural populations
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Data from: Precipitation drives global variation in natural selection
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Effects of density on the strength of sexual selection in the lab and in nature in an undescribed amphipod species
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Beauty or function? The opposing effects of natural and sexual selection on cuticular hydrocarbons in male black field crickets
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The stabilising impact of natural selection on the allometry of sexual ornaments: Fish that escape locomotor constraints exhibit extravagant ornamentation
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Data from: Nutritional geometry provides insight into the dual roles of natural and sexual selection in insect cuticular hydrocarbon evolution
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Data from: Adaptive divergence in flowering time among natural populations of Arabidopsis thaliana: estimates of selection and QTL mapping
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Harvest and natural predation shape selection for behavioral predictability in male wild turkeys
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Selection against individuals from genetic introgression of escaped farmed salmon in a natural population of Atlantic salmon
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Impacts of environmental heterogeneity on natural selection in a wild bird population
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Data from: Functional Frogs: Using swimming performance as a model to understand natural selection and adaptations
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The evolution of sexually dimorphic traits in ecological gradients: An interplay between natural and sexual selection in hummingbirds
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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.