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194 results for “population abundance”
Figure 1 from: Watts C, Thornburrow D, Stringer I, Cave V (2017) Population expansion by Cook Strait giant wētā, Deinacrida rugosa (Orthoptera: Anostostomatidae), following translocation to Matiu/Somes Island, New Zealand, and subsequent changes in abundance. Journal of Orthoptera Research 26: 171-180. https://doi.org/10.3897/jor.26.21712
Figure 1 - Arrangement of tracking tunnel transects (shown in white) along the footpaths on Matiu-Somes Island. Each circle indicates the location of a tracking tunnel. The dark hatched area indicates where Deinacrida rugosa were released in 1996. The light hatched area shows where 186 adult D. rugosa were taken for translocation in 2007 and 2008. Note that no wētā were removed from the North transect.
Figure 3 from: Watts C, Thornburrow D, Stringer I, Cave V (2017) Population expansion by Cook Strait giant wētā, Deinacrida rugosa (Orthoptera: Anostostomatidae), following translocation to Matiu/Somes Island, New Zealand, and subsequent changes in abundance. Journal of Orthoptera Research 26: 171-180. https://doi.org/10.3897/jor.26.21712
Figure 3 - Distribution of tracking tunnels with footprints of adult Deinacrida rugosa in 2008, 2013 and 2015. Cards were set over 3 nights in 2008 (Watts et al. (2009, 2011)) and over 4 nights in 2013 and 2015.
Figure 2 from: Watts C, Thornburrow D, Stringer I, Cave V (2017) Population expansion by Cook Strait giant wētā, Deinacrida rugosa (Orthoptera: Anostostomatidae), following translocation to Matiu/Somes Island, New Zealand, and subsequent changes in abundance. Journal of Orthoptera Research 26: 171-180. https://doi.org/10.3897/jor.26.21712
Figure 2 - Locations where all adult Deinacrida rugosa were found in 2008, 2013, 2015 and 2016. Tracking tunnel transects are indicated as white lines. 2008 data from Watts et al. (2009, 2011).
Fig. 3 in Rodent population cycle as a determinant of gastrointestinal nematode abundance in a low-arctic population of the red fox
Fig. 3. Annual prevalence of the two Ascarididae species relative to rodent abundance the autumn preceding winter when the foxes were sampled.
Data from: An integrated assessment model of seabird population dynamics: can individual heterogeneity in susceptibility to fishing explain abundance trends in Crozet wandering albatross?
1. Seabirds have been incidentally caught in distant-water longline fleets operating in the Southern Ocean since at least the 1970s, and breeding numbers for some populations have shown marked trends of decline and recovery concomitant with longline fishing effort within their distributions. However, lacking is an understanding of how forms of among-individual heterogeneity may interact with fisheries bycatch and influence population dynamics. 2. We develop a model that uses comprehensive data on the spatial and temporal distributions of fishing effort and seabird foraging to estimate temporal overlaps, fishery catchability and consequent bycatch. We apply a population model that is structured by age, sex, life stage and spatially to Crozet Island wandering albatross and explore how heterogeneity in susceptibility to capture may have influenced the population's demography over time. 3. A model where some birds were assumed to be more susceptible to fisheries bycatch was able to successfully replicate the observed trend in breeding pairs. Considerably poorer fits were found without this assumption. Results suggested that the more susceptible birds may have been removed from the population by the 1990s. 4. The model was also able to highlight areas, times and fleets prone to increased bycatch. Knowledge of these factors should assist fisheries and conservation management bodies to quantify and reduce seabird bycatch through spatial management and fleet-specific mitigation efforts. 5. Synthesis and application. Many seabirds show complex life histories that make them highly susceptible to additional incidental mortality from fishing vessels. By applying a population model that integrates key aspects of seabird and fishery dynamics, we were able to explain the observed trends in the breeding population of Crozet wandering albatross and identify key areas and fleets where further mitigation may be required. In addition, the potential removal of a category of birds that shows increased susceptibility to capture has important implications for the conservation management of this population and other iconic species incidentally caught by large-scale commercial fisheries.
Data from: An integrated assessment model of seabird population dynamics: can individual heterogeneity in susceptibility to fishing explain abundance trends in Crozet wandering albatross?
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Meiobenthos abundance. Long-term variability and dynamics of estuarine meiobenthic populations for North Inlet Estuary, South Carolina, from 1972 to 1992, North Inlet LTER
The original purpose of this research was to determine if natural meiobenthic assemblages exhibited continuity over time and to monitor several physical variables to determine if these influenced long-term temporal patterns. The most recent study focused on variation and the relations of meiobenthos abundance with environmental factors over 11 years. Typically marine benthic community studies are limited temporally and the majority of previously published 'longterm' meiofauna results (all taxa) were based on about a year's duration.
Data from: Mixture modeling of transcript abundance classes in natural populations
BACKGROUND: Populations diverge in genotype and phenotype under the influence of such evolutionary processes as genetic drift, mutation accumulation, and natural selection. Because genotype maps onto phenotype by way of transcription, it is of interest to evaluate how these evolutionary factors influence the structure of variation at the level of transcription. Here, we explore the distributions of cis-acting and trans-acting factors and their relative contributions to expression of transcripts that exhibit two or more classes of abundance among individuals within populations. RESULTS: Expression profiling using cDNA microarrays was conducted in Drosophila melanogaster adult female heads for 58 nearly isogenic lines from a North Carolina population and 50 from a California population. Using a mixture modeling approach, transcripts were identified that exhibit more than one mode of transcript abundance across the samples. Power studies indicate that sample sizes of 50 individuals will generally be sufficient to detect divergent transcript abundance classes. The distribution of transcript abundance classes is skewed toward low frequency minor classes, which is reminiscent of the typical skew in genotype frequencies. Similar results are observed in reported data on gene expression in human lymphoblast cell lines, in which analysis of association with linked polymorphisms implies that cis-acting single nucleotide polymorphisms make only a modest contribution to bimodal distributions of transcript abundance. CONCLUSION: Population surveys of gene expression may complement genetical genomics as a general approach to quantifying sources of transcriptional variation. Differential expression of transcripts among individuals is due to a complex interplay of cis-acting and trans-acting factors.
Figure 2 in Changes in abundance and community structure of the zooplankton population during the 2008 mucilage event in the northeastern Marmara Sea
Figure 2. Temperature, salinity, and dissolved oxygen profiles.
Feather traits, wing morphology and abundance of southern populations of Sylvia atricapilla related to altitudinal movements
<p>Moult of birds is shaped by environmental and genetic drivers whose relative contribution to the structure of feathers may differ within and between populations. In this study we compare some traits of tail feathers (growth bars, mass, rachis width and barb length) between four populations of the Eurasian blackcap (<i>Sylvia atricapilla</i>) breeding at different elevations within the southwestern Palaearctic. We tested if these traits were related to the primary productivity of habitats (a surrogate of food availability) or were better explained as an adaptation to altitudinal movements. The distribution of primary productivity was positively related to blackcap abundance suggesting that the species tracked the most productive areas to breed. In this environmental setting, wing morphology (wing length, concavity and pointedness) suggested that lowland blackcaps were sedentary while blackcaps from highland areas were involved in altitudinal movements. The feathers of blackcaps inhabiting the highlands showed wider growth bars and rachis than those of the most productive lowland areas, but did not differ in feather mass and barb length. Fast feather growth has been related to time constraints to moult and wider rachis to improve flight efficiency in migratory birds. Our results therefore suggest that differences in feather characteristics between southern populations of the Eurasian blackcap are better interpreted as an adaptive response to altitudinal migration than as a consequence of regional food availability.</p>
Data from: Mixture modeling of transcript abundance classes in natural populations
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Data from: Strength of sexual and postmating prezygotic barriers varies between sympatric populations with different histories and species abundances
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Feather traits, wing morphology and abundance of southern populations of Sylvia atricapilla related to altitudinal movements
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SEGUE data for Bovy et al. (2012, 2013) mono-abundance populations papers
<p>This is the SEGUE data used in the Bovy et al. (2012, 2013) papers on the decomposition of the Milky Way disk in terms of mono-abundance stellar populations:</p> <ul> <li><a href="http://adsabs.harvard.edu/abs/2012ApJ...753..148B">The Spatial Structure of Mono-abundance Sub-populations of the Milky Way Disk</a>, Bovy, Rix, Liu, et al. (2012)</li> <li><a href="http://adsabs.harvard.edu/abs/2012ApJ...751..131B">The Milky Way Has No Distinct Thick Disk</a>, Bovy, Rix, & Hogg (2012)</li> <li><a href="http://adsabs.harvard.edu/abs/2012ApJ...755..115B">The Vertical Motions of Mono-abundance Sub-populations in the Milky Way Disk</a>, Bovy, Rix, Hogg, et al. (2012)</li> <li><a href="http://adsabs.harvard.edu/abs/2013ApJ...779..115B">A Direct Dynamical Measurement of the Milky Way's Disk Surface Density Profile, Disk Scale Length, and Dark Matter Profile at 4 kpc ~ R ~ 9 kpc</a>, Bovy & Rix (2013)</li> </ul> <p>This data can be used together with the code available <a href="https://github.com/jobovy/segue-maps">here</a> and <a href="https://github.com/jobovy/segueSelect">here</a> to reproduce the results in that paper. For completeness, similar data on K dwarfs in SEGUE is also included, but note that the selection function of these data is significantly more complicated than that of the G dwarf data.</p> <p>This dataset can almost entirely be reconstructed using the SQL queries given <a href="https://github.com/jobovy/segue-maps/tree/master/sql">here</a> on SDSS Sky Server, except for the [a/Fe] values from SDSS DR8, which were never made public. These [a/Fe] values are provided here <em>solely</em> for the purpose of reproducing the results from the above papers and should not be used for other purposes. Please contact the SEGUE team (Young-Sun Lee, Tim Beers, Connie Rockosi) if you want access to these data for other purposes.</p>
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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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.