Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
1,659
datasets available to search
ShareScore release 0.9.0
Dataset results
1,659 results for “structured population”
Figure 2 in The occurrence of facultative paedomorphosis in a lacustrine population of the Pyrenean newt (Calotriton asper): morphology and age structure
Figure 2. Plot of the first two PCs of the newts of the Ibón de Perramó population, showing differences between males, females and juveniles.
Figure 3 in The occurrence of facultative paedomorphosis in a lacustrine population of the Pyrenean newt (Calotriton asper): morphology and age structure
Figure 3. (a) Age structure of the newts of Ibón de Perramó population in males (M) and females (F). (b) Age structure of the newts of Ibón de Perramó population in branchiate juveniles (BJ), metamorphosed juveniles (MJ) and larvae (L).
Figure 6 in Life cycle and population structure of the terrestrial isopod Hemilepistus klugii (Brandt, 1833) (Isopoda: Oniscidea) in Iran
Figure 6. Correlation between cephalothorax width and egg number in ovigerous females of Hemilepistus klugii from Varamin.
Figure 4 in Life cycle and population structure of the terrestrial isopod Hemilepistus klugii (Brandt, 1833) (Isopoda: Oniscidea) in Iran
Figure 4. Frequency distribution of cephalothorax width in Hemilepistus klugii from Varamin from February 2008 to May 2009. Same key as Figure 1.
Figure 3 in Life cycle and population structure of the terrestrial isopod Hemilepistus klugii (Brandt, 1833) (Isopoda: Oniscidea) in Iran
Figure 3. Frequency of ovigerous, post-ovigerous and non-ovigerous females in Hemilepistus klugii during the breeding season (March–April 2008 and 2009) from Varamin based on weekly sampling.
Figure 1 in Life cycle and population structure of the terrestrial isopod Hemilepistus klugii (Brandt, 1833) (Isopoda: Oniscidea) in Iran
Figure 1. Frequency distribution of overall cephalothorax width in Hemilepistus klugii from Varamin.
Agriculture creates subtle genetic structure among migratory and non-migratory populations of burrowing owls throughout North America
Population structure across a species distribution primarily reflects historical, ecological and evolutionary processes. However, large-scale contemporaneous changes in land use have the potential to create changes in habitat quality and thereby cause changes in gene flow, population structure, and distributions. As such, land-use changes in one portion of a species range may explain declines in other portions of their range. For example, many burrowing owl populations have declined or become extirpated near the northern edge of the species' breeding distribution during the second half of the 20th century. In the same period, large extensions of thornscrub were converted to irrigated agriculture in northwestern Mexico. These irrigated areas may now support the highest densities of burrowing owls in North America. We tested the hypothesis that burrowing owls that colonized this recently created owl habitat in northwestern Mexico originated from declining migratory populations from the northern portion of the species' range (migration-driven breeding dispersal whereby long-distance migrants from Canada and the U.S. became year-round residents in the newly created irrigated agriculture areas in Mexico). We used 10 novel microsatellite markers to genotype 1,560 owls from 36 study locations in Canada, Mexico, and the United States. We found that burrowing owl populations are practically panmictic throughout the entire North American breeding range. However, an analysis of molecular variance provided some evidence that burrowing owl populations in northwestern Mexico and Canada together are more genetically differentiated from the rest of the populations in the breeding range, lending some support to our migration-driven breeding dispersal hypothesis. We found evidence of subtle genetic differentiation associated with irrigated agricultural areas in southern Sonora and Sinaloa in northwestern Mexico. Our results suggest that land-use can produce location-specific population dynamics leading to subtle genetic structure even in the absence of dispersal barriers.
Figure 5 in Geographical variations in waving display and barricade-building behaviour, and genetic population structure in the intertidal brachyuran crab Ilyoplax pusilla (de Haan, 1835)
Figure 5. Mean number of barricades per burrow in Ilyoplax pusilla at six localities (bar indicates SD). Localities arranged according to latitude. Shared alphabetical letters indicate no significant difference (p.0.05) by Tukey's honestly significant difference test.
Figure 2 in Geographical variations in waving display and barricade-building behaviour, and genetic population structure in the intertidal brachyuran crab Ilyoplax pusilla (de Haan, 1835)
Figure 2. Cheliped path movement in Ilyoplax pusilla: circular type and vertical type. Arrows indicate wave path.
Figure 6 in Geographical variations in waving display and barricade-building behaviour, and genetic population structure in the intertidal brachyuran crab Ilyoplax pusilla (de Haan, 1835)
Figure 6. Parsimony network of mitochondrial DNA cytochrome oxidase subunit I (COI) haplotypes of Ilyoplax pusilla. Haplotypes correspond to Table 5. Single solid line indicates one base. Circle size indicates number of each haplotype. Largest circle, n542; second largest, n514 or 15; third, n58; fourth, n54 or n55; fifth, n52; smallest circle, n51.
Figure 1 in Geographical variations in waving display and barricade-building behaviour, and genetic population structure in the intertidal brachyuran crab Ilyoplax pusilla (de Haan, 1835)
Figure 1. Geographic distribution of Ilyoplax pusilla in Japan (broken line) from Wada et al. (1992), and six localities studied.
Figure 4 in Geographical variations in waving display and barricade-building behaviour, and genetic population structure in the intertidal brachyuran crab Ilyoplax pusilla (de Haan, 1835)
Figure 4. Proportion of extended waves in 30 waving motions of Ilyoplax pusilla at six localities (bar indicates SD). Localities arranged according to latitude. Shared alphabetical letters indicate no significant difference (p.0.05) by Tukey's honestly significant difference test.
Figure 3 in Geographical variations in waving display and barricade-building behaviour, and genetic population structure in the intertidal brachyuran crab Ilyoplax pusilla (de Haan, 1835)
Figure 3. Maximum cheliped extension during waving movements in Ilyoplax pusilla: extended type and non-extended type.
Data from: Distribution and biogeography of Sanguina snow algae: fine-scale sequence analyses reveal previously unknown population structure
It has been previously suggested that snow algal species within the genus Sanguina (S. nivaloides and S. aurantia) show no population structure despite being found globally (S. nivaloides) or throughout the Northern Hemisphere (S. aurantia). However, systematic biogeographic research into global distributions is lacking due to few genetic and no genomic resources for these snow algae. Here, using all publicly available and previously unpublished Sanguina sequences of the Internal Transcribed Spacer 2 region, we investigate if this purported lack of population structure within Sanguina species is supported by additional evidence. Using a minimum entropy decomposition (MED) approach to examine fine-scale genetic population structure, we find that these snow algae populations are largely distinct regionally and have some interesting biogeographic structuring. This is in opposition to the currently accepted idea that Sanguina species lack any observable population structure across their vast ranges and highlights the utility of fine-scale (sub-OTU) analytical tools to delineate geographic and genetic population structure. This work extends the known range of S. aurantia and emphasizes the need for development of genetic and genomic tools for additional studies on snow algae biogeography.
Oxytenanthera abyssinica (A. Rich.) Munro; lowland bamboo (Poaceae, Bambusinea) in Ethiopia: Genetic diversity, population structure and gene flow analysis
<p><span>As one of the most important non-timber forest resources, a potential alternative to wood and wood product and fastest-growing plant in the world (91 cm (35 in) per day), bamboo is a member of the grass family (Poaceae) and constitutes a single subfamily Bambusoideae. 67% of total area of bamboo in Africa and 7% of world total is contributed by Ethiopia giving more than 1.44 million hectares. Silica gel dried young fresh leaves from 130 individuals of O. abyssinica were collected for DNA extraction and PCR amplification. Each of the PCR amplified ISSR fragments using 19 ISSR primers were used to study band pattern and heterozigosity, level of polymorphism, calculating marker efficiency, Nei`s (H) and Shannon (I) genetic diversity, analysis of molecular variance (AMOVA), analysis for cluster, principal coordinates (PCoA) and admixture results. High genetic variation at species level was observed with the percentage of the polymorphic loci (PPL) = 84.48%. The H, I, observed number of alleles (Na) and effective number of alleles (Ne) at species level was 0.2702, 0.4061, 1.8448, and 1.4744, respectively, showing a relatively high level of genetic diversity. However, the genetic differentiation at the population level was relatively low. AMOVA using grouped populations revealed that, most of the diversity was distributed within the populations (61.05%) with F<sub>ST</sub> = 0.38949, F<sub>SC</sub> = 0.10486 and F<sub>CT</sub> = 0.31797. Cluster analysis grouped the populations into sharply distinct clusters, which could be attributed to cross pollination nature of the plant and long lived to the area. STRUCTURE analyses for all population and excluding Gambella population gives different result K = 2 and K = 11. Using these markers, we find strong evidence linking geographic origin of diversity and samples from Gambella Region found different from others and might tell the availability of additional bamboo species in the country.</span></p>
Genomic assessment of global population structure in a highly migratory and habitat versatile apex predator, the tiger shark (Galeocerdo cuvier)
<p>Understanding the population dynamics of highly mobile, widely distributed, oceanic sharks, many of which are overexploited, is necessary to aid their conservation management. We investigated the global population genomics of tiger sharks (<i>Galeocerdo cuvier</i>), a circumglobally distributed, apex predator displaying remarkable behavioral versatility in its diet, habitat use (near coastal, coral reef, pelagic), and individual movement patterns (spatially resident to long-distance migrations). We genotyped 242 tiger sharks from 10 globally distributed locations at more than 2000 single nucleotide polymorphisms. Although this species often conducts massive distance migrations, the data show strong genetic differentiation at both neutral (<i>F</i><sub>ST</sub>=0.125-0.144) and candidate outlier loci (<i>F</i><sub>ST</sub>=0.570-0.761) between western Atlantic and Indo-Pacific sharks, suggesting the potential for adaptation to the environments specific to these oceanic regions. Within these regions, there was mixed support for population differentiation between northern and southern hemispheres in the western Atlantic, and none for structure within the Indian Ocean. Notably, the results demonstrate a low level of population differentiation of tiger sharks from the remote Hawaiian archipelago compared to sharks from the Indian Ocean (<i>F</i><sub>ST</sub>=0.003-0.005, <i>P</i><0.01). Given concerns about biodiversity loss and marine ecosystem impacts caused by overfishing of oceanic sharks in the midst of rapid environmental change, our results suggest it imperative that international fishery management prioritize conservation of the evolutionary potential of the highly genetically differentiated Atlantic and Indo-Pacific populations of this unique apex predator. Furthermore, we suggest targeted management attention to tiger sharks in the Hawaiian archipelago based on a precautionary biodiversity conservation perspective.</p>
FIG. 4 in Age structure and growth in an isolated population of Pelodytes punctatus in northern Spain
FIG. 4. Growth in length body (SVL) of P. punctatus in Burgos, Spain. Mean and range are given at each age. Curves fitted to the Von Bertalanffy equation.
FIG. 1 in Age structure and growth in an isolated population of Pelodytes punctatus in northern Spain
FIG. 1. Cross-sections at the diaphysis of phalanges for P. punctatus in Burgos, Spain. (A) Male, 40.3 mm SVL, six LAGs; (B) female, 45.5 mm SVL, five LAGs. Arrows, LAGs; ml, metamorphosis line; eb, endosteal bone.
FIG. 3 in Age structure and growth in an isolated population of Pelodytes punctatus in northern Spain
FIG. 3. Snout–vent length distribution of P. punctatus in Burgos, Spain. Black bars, males; grey bars, females.
Figure 4 in Phylogenetic structure among pocket gopher populations, genus Thomomys (Rodentia: Geomyidae), on the Baja California Peninsula
Figure 4. Unrooted tree based on Bayesian and maximum-likelihood (ML) analyses of Baja California Peninsula (BCP) pocket gophers using the nuclear gene IRBP (396 bp). Letters indicate the locality of the sequence according to Table 1. Support values are Bayesian (posterior probability)/ML bootstrap values (percentage).
ScienceDex guides
Understand access before you commit
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.