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230
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Dataset results
230 results for “population decline”
Data from: Predator-prey role reversal may impair the recovery of declining pike populations
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Data from: Evaluating effective population size and genetic diversity of a declining kit fox population using contemporary and historical specimens
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Data from: Environmental estrogens cause predation-induced population decline in a freshwater fish
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Determinants of nest box local recruitment and natal dispersal in a declining bird population
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Data from: Heterozygosity-fitness correlations in a declining seabird population
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Data from: Patterns of diversity and spatial variability of β-defensin innate immune genes in a declining wild population of tree swallows
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Data from: Genetic decline, restoration and rescue of an isolated ungulate population
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Data from: Multi-scale model of regional population decline in little brown bats due to white-nose syndrome
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Declining invasive grey squirrel populations may persist in refugia as native predator recovery reverses squirrel species replacement
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Data from: Decline and recovery of a large carnivore: environmental change and long-term trends in an endangered brown bear population
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Data from: Quantifying the links between land use and population growth rate in a declining farmland bird
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Data from: Loss of functional connectivity in migration networks induces population decline in migratory birds
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Genotype data for: Population genetics reveals divergent lineages and ongoing hybridization in a declining migratory fish species complex
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Quantifying temporal variation in dietary niche to reveal drivers of past population declines; stable isotope, harvest trends, and land use
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Data from: Combined bottom-up and top-down pressures drive catastrophic population declines of Arctic skuas in Scotland
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Data from: Influence of mate and nest-site fidelity on a declining, urban avian population
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Data from: Disentangling the spatial and temporal causes of decline in a bird population
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Data for spatial and temporal refugia for an insect population declining due to climate change
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Population decline of a long-distance migratory passerine at the edge of its range: nest predation, nest replacement, and immigration
<p class="CxSpFirst">The relative importance of predators and resources (i.e., food) for the dynamics of migratory bird populations is poorly known. Resource availability may be more likely in resource poor environments, but given that nest failure in most systems is due mainly to predation, predator effects may predominate. We document a rapid decline of an isolated Eastern Kingbird (<i>Tyrannus tyrannus</i>) population breeding in the Great Basin Desert of eastern Oregon, USA, and evaluate whether it was driven by limited food resources (water availability ~ food), nest predation, or first-year or adult return rate (RR<sub>J</sub> and RR<sub>A</sub>, respectively) that reflect nonbreeding season events. Most nests failed (~68% of nests) due mainly to nest predation (>90% of failures); nestling starvation was rare. Bioyear precipitation (October-April), breeding season precipitation, and river flow all varied widely but none could account for annual variation in either nest success (NS) or fledging success of successful nest (FSSN). Neither RR<sub>J</sub> nor RR<sub>A</sub> varied with year, any measure of water resources, or reproductive success. Annual population growth rate (ln[N<sub>t+1</sub>/N<sub>t</sub>]) was independent of year, all measures of water availability, RR<sub>J</sub> and RR<sub>A</sub>, and NS of replacement nests, but was high following years of high NS of initial nests; FSSN was also higher in years of high NS. High rates of nest predation, due likely to the expansion of the local American Crow (<i>Corvus brachyrhynchos</i>) population, appeared to drive the population decline. Empirical data and population simulations indicated that replacement nests contributed little to λ, while simulations revealed that, given site-specific vital rates, the decline would have been even greater without immigration (λ = 0.812) than the observed (λ = 0.914). Long distance dispersal may thus be critical for persistence of kingbirds in the naturally highly fragmented habitat that it occupies in the Great Basin Desert.</p>
Local human population increase in the non-breeding areas of long-distance migrant bird species is only weakly associated with their declines, even for synanthropic species
<p><span>Aim: To show how recent declines in populations of long-distance migrant birds are associated with recent increases in human population growth and agricultural intensification on their tropical non-breeding grounds, except for synanthropic species, where we expect the reverse.</span></p> <p><span>Location: Breeding populations throughout Europe and North America spending the non-breeding season throughout Africa, and Central and South America, respectively. </span></p> <p><span>Methods: </span>We mapped 50 species of long-distance migrant birds from published tagging studies of 126 breeding populations and identified their breeding population trends from 2000-2015 from published Country or State census data. We then matched individual bird non-breeding locations, from each population, to local human population change and crop yield data. We used GLMs to predict whether bird population decline was associated with human population change or crop yield and whether this was dependent on if a species was synanthropic or not, controlling for absolute human population density, breeding and non-breeding location, migratory distance and phylogeny. We predicted that bird populations that spend the non-breeding season in areas of recent higher human population increase or agricultural intensification (crop yield), would show greater declines, but that declines would be less for species that frequently utilize anthropogenic habitats such as secondary woodland and farmland.</p> <p><span>Results: </span>Bird population change, even for synanthropic species, showed a significant negative relationship with relative human population change and crop yield (but this was weak, <2% and 6% of variance respectively), and this relationship was the same for the Neotropics and Africa, despite African human population change being three times larger.</p> <p><span>Main conclusions: </span>The results suggest that local human population change in the non-breeding area is likely to be only a relatively minor driver of migrant declines, and its effects may be through increases in agricultural intensification reducing carrying capacity but we currently lack local studies to confirm this.</p>
ScienceDex guides
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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.