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308 results for “density dependence”
Intersexual differences in density-dependent dispersal and their evolutionary drivers
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Data from: Density-dependent reproductive success among sympatric dipterocarps during a major mast fruiting event
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Population regulation and density‐dependent demography in the Trinidadian guppy
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Density dependence of seed dispersal and fecundity profoundly alters the spread dynamics of plant populations
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Data from: Density-dependent adaptive topography in a small passerine bird, the collared flycatcher
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Data from: Density-dependent resource partitioning of temperate large herbivore populations under rewilding
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Data from: Density-dependent disease, life history tradeoffs, and the effect of leaf pathogens on a suite of co-occurring close relatives
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Ecological and behavioral mechanisms of density-dependent habitat expansion in a recovering African ungulate population
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Episodic herbivory, plant density dependence and stimulation of aboveground plant production
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Density-dependent changes of mating system and family structure in Brandt's voles (Lasiopodomys brandtii)
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A Great Escape: resource availability and density-dependence shape population dynamics along trailing range edges
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Relatedness modulates density-dependent cannibalism rates in Drosophila
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Seasonal density-dependence can select for partial migrants in migratory species
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Data from: The relative strengths of rapid and delayed density dependence acting on a terrestrial herbivore change along a pollution gradient
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Density-dependent within-patch movement behavior of two competing species
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Robust surface-to-mass coupling and turgor-dependent cell width determine bacterial dry-mass density
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Density-dependent declines of Wisconsin bats from white-nose syndrome
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Data from: Exploring density and frequency dependent interactions experimentally: an R program for generating hexagonal fan designs.
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Data from: A quantitative review of density-dependent growth and survival in salmonids: biological mechanisms, methodological biases, and management implications
<p>Understanding the complex variation in patterns of density-dependent individual growth and survival across populations is critical to adaptive fisheries management, but the extent to which this variation is caused by biological or methodological differences is unclear. Consequently, we conducted a correlational meta-analysis of published literature to investigate the relative importance of methodological and biological predictors on the shape and strength of density-dependent individual growth and survival in salmonids. We obtained 160 effect sizes from 75 studies of 12 species conducted between 1977-2019 that differed in experimental approach (sensu Hurlbert, 1984; 65 laboratory experiments, 60 observational field studies, and 35 field experiments). The experimental approach was the strongest factor influencing the strength of density-dependence across studies: density-dependent survival was stronger than growth in field observational studies, whereas laboratory experiments detected stronger density-dependent growth than survival. The difference between density-dependent growth and survival was minimal in field experiments, and between lotic and lentic habitats. The shape of density-dependence (logarithmic, linear, exponential, or density-independent) could be predicted with 66.7% accuracy based solely on the experimental approach and the density gradient (highest/lowest*100) of the study. Overall, the strength and shape of density-dependence were primarily influenced by methodological predictors, while biological factors (predator presence, food abundance, and species) had predictable but modest effects. For both empirical studies and adaptive fisheries management, we recommend using field experiments with a density gradient of at least 460% to detect the proper shape of the density-dependent response, or accounting for potential biases if observational or laboratory studies are conducted.</p>
Dispersal evolution diminishes the negative density dependence in dispersal
In many organisms, dispersal varies with the local population density. Such patterns of density-dependent dispersal (DDD) are expected to shape the dynamics, spatial spread and invasiveness of populations. Despite their ecological importance, empirical evidence for the evolution of DDD patterns remains extremely scarce. This is especially relevant because rapid evolution of dispersal traits has now been empirically confirmed in several taxa. Changes in DDD of dispersing populations could help clarify not only the role of DDD in dispersal evolution, but also the possible pattern of subsequent range expansion. Here, we investigate the relationship between dispersal evolution and DDD using a long-term experimental evolution study on Drosophila melanogaster. We compared the DDD patterns of four dispersal-selected populations and their non-selected controls. The control populations showed negative DDD, which was stronger in females than in males. In contrast, the dispersal-selected populations showed density-independent dispersal, where neither males nor females exhibited DDD. We compare our results with previous evolutionary predictions that focused largely on positive DDD, and highlight how the direction of evolutionary change depends on the initial DDD pattern of a population. Finally, we discuss the implications of DDD evolution for spatial ecology and evolution.
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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.