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184 results for “high latitude”
Data from: Icing-related injuries in polar bears (Ursus maritimus) at high latitudes
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Data from: Climate warming is predicted to enhance the negative effects of harvesting on high-latitude lake fish populations
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Data from: Food-web structure varies along environmental gradients in a high-latitude marine ecosystem
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Physiological acclimatization in high-latitude zooplankton
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Data from: Assessing the effects of human activities on the foraging opportunities of migratory shorebirds in Austral high-latitude bays
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Data from: Climatic thresholds shape northern high-latitude fire regimes and imply vulnerability to future climate change
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Data from: Trepostomate bryozoans from the upper Katian (Upper Ordovician) of Morocco: gigantism in high latitude Gondwana platforms
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Data from: Lake size and fish diversity determine resource use and trophic position of a top predator in high-latitude lakes
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Ancient tropical extinctions at high latitudes contributed to the latitudinal diversity gradient
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Data from: Diversification at high latitudes: speciation of buntings in the genus Plectrophenax inferred from mitochondrial and nuclear markers
High-latitude diversification is a process characterized by speciation and extinction due to climatically driven vicariance and dispersal events. McKay's buntings (Plectrophenax hyperboreus) are high-latitude island endemic songbirds, and their global range is restricted to Beringia. Snow buntings (P. nivalis), their closest relatives, are distributed throughout the Holarctic, breeding in available habitat surrounding the island range of McKay's buntings. We sequenced 1123 base pairs of mitochondrial DNA for 40 individuals of each species and analyzed a total of 913 AFLPs for 57 individuals. Both marker types suggested weak but significant genetic differentiation. Analysis of sequence data indicated divergence occurring when the current breeding range of McKay's buntings was a hill on the Beringian steppe (~18,400 to ~73,700 years before present), suggesting that snow buntings were restricted to lower latitudes by ice sheets. Ancestral effective population size estimates indicate a founder event in McKay's buntings followed by an expansion and then a reduction in effective size. Rising sea levels and asymmetric hybridization from McKay's buntings into the postglacially-colonizing population of snow buntings could account for this reduction. Reproductive isolation is likely maintained through differential arrival dates on breeding grounds and the high breeding density of McKay's buntings. This recent, high-latitude divergence best fits a model of founder event speciation driven by vicariance and oscillations in habitat due to climate change.
FIGURE 4. Discoconchoecia elegans, station N-2. A in A re-description of Discoconchoecia elegans (Sars, 1865) (Ostracoda: Halocyprididae) from high latitudes in the North Atlantic
FIGURE 4. Discoconchoecia elegans, station N-2. A, female; B, male.
FIGURE 5 in A re-description of Discoconchoecia elegans (Sars, 1865) (Ostracoda: Halocyprididae) from high latitudes in the North Atlantic
FIGURE 5. Discoconchoecia elegans, male, station N-1. A, hook-like seta, B, oval ring on e-seta.
FIGURE 3 in Taxonomy of high-latitude Goniasteridae (Subantarctic & Antarctic): one new genus, and three new species with an overview and key to taxa
FIGURE 3. Character distribution and bathymetric range of Chitonaster spp.
Data from: Population genetics of a broadcast-spawning coral across a tropical-temperate transition zone reveals regional differentiation and isolation of high-latitude reefs
<p>Aim: Genetic connectivity is a key component of species resilience to climate change in terms of recovery capacity following disturbance and capacity to disperse to novel locations as the climate warms and isotherms shift poleward. We aimed to strengthen our understanding of resilience in this context by characterizing patterns of connectivity and genetic diversity in a broadcast spawning coral across a tropical-temperate transition zone. We hypothesize genetic differentiation between tropical and temperate populations and decreasing genetic diversity with higher latitudes.</p> <p>Location: Western Australia (WA).</p> <p>Taxon: <i>Turbinaria </i>species complex. <i>Turbinaria reniformis </i>Oken, 1815 (Dendrophylliidae).</p> <p>Methods: Samples from 930 target corals were collected from ten locations between 13 - 32<sup> o</sup> latitude spanning a 9° C mean temperature range. <i>In-situ</i> species identification of <i>T. reniformis </i>is hindered by morphological plasticity and homoplasy with sister species. We<i> </i>combined Sanger sequencing of two mitochondrial DNA markers and high-throughput genotyping by sequencing (GBS) to isolate a single genetic <i>Turbinaria</i> lineage from our dataset through which patterns of genetic flow and diversity along the WA coastline could be explored using population- and individual-based analyses.</p> <p>Results: Mitochondrial DNA sequence variation was low among <i>Turbinaria</i> samples and could not resolve individual species. Using GBS, we identified three genetically distinct lineages. Subsequent analyses within one of these lineages revealed strong spatial subdivision with 2-3 genetic clusters. While temperate populations were genetically diverged from more tropical sites, we did not observe declines in genetic diversity with latitude.</p> <p>Main Conclusions: Temperate coral populations in Western Australia are genetically isolated from their tropical counterparts. Tropical populations of <i>T. 'reniformis' </i>exhibit adequate connectivity.<i> </i>Shark Bay represents the current southern limit of the tropical population of <i>T. 'reniformis'</i>. Interestingly, temperate <i>T. 'reniformis'</i> in this study exhibit some genetic resilience due to their relatively high genetic diversity, yet the strong patterns of genetic subdivision for this widely dispersing coral species potentially limit their resilience to future climate scenarios.</p>
Supplementary material 1 from: Maturana CS, Rosenfeld S, Naretto J, Convey P, Poulin E (2019) Distribution of the genus Boeckella (Crustacea, Copepoda, Calanoida, Centropagidae) at high latitudes in South America and the main Antarctic biogeographic regions. ZooKeys 854: 1-15. https://doi.org/10.3897/zookeys.854.29614
: Data type: ocurrence dataset
Figure 2 from: Maturana CS, Rosenfeld S, Naretto J, Convey P, Poulin E (2019) Distribution of the genus Boeckella (Crustacea, Copepoda, Calanoida, Centropagidae) at high latitudes in South America and the main Antarctic biogeographic regions. ZooKeys 854: 1-15. https://doi.org/10.3897/zookeys.854.29614
Figure 2 Map of the sampling locations in South America, sub- and maritime Antarctica. Six species were identified following the traditional taxonomic key (Bayly 1992a). Boeckellapoppei is present across the three Antarctic biogeographic regions. Drawings of the fifth male leg are modifications from Bayly (1992a).
Figure 1 from: Maturana CS, Rosenfeld S, Naretto J, Convey P, Poulin E (2019) Distribution of the genus Boeckella (Crustacea, Copepoda, Calanoida, Centropagidae) at high latitudes in South America and the main Antarctic biogeographic regions. ZooKeys 854: 1-15. https://doi.org/10.3897/zookeys.854.29614
Figure 1 Spatial distribution of 14 Boeckella species from the targeted study area. The western (left side) and eastern (right side) of southern South America (green/blue: subpolar forest; brown: grassland), sub-Antarctic islands (light blue) and maritime Antarctic regions (light grey) obtained from records (red: obtained from field sampling; blue: obtained from literature and GBIF database) of all combined data sources. *: discrete outlier records; dash bars: distribution extended north of 40°S; dashed lines: geographic discontinuity. Records from East Antarctic were not included.
MIDAS GPS TEC data for "On the Annual Asymmetry of High-Latitude Sporadic-F" (Space Weather)
<p>GPS-based TEC data related to high-latitude ionospheric variability in 2014</p>
Warming drives poleward range contractions of Beringian endemic plant species at high latitudes
<p><strong><span>Aim</span></strong><span>: Species are expected to disperse poleward in response to climate change. For species that are endemic to the high latitudes, this implies that many in the future would face a "no-where-to-go" situation as they are currently occupying the northernmost portion of the continent. Further, because endemism may arise from a combination of physical barriers, climate, and geological history, the persistence of many species may require spatial matching of multiple environmental factors within a limited dispersal space. Thus, it is not clear how endemic species might spatially adjust their distributions in response to climate change and whether there are future climate change refugia for these species. </span></p> <p><strong><span>Location</span></strong><span>: Northwest North America </span></p> <p><strong><span>Taxa</span></strong><span>: Plants </span></p> <p><span><strong>Time</strong> <strong>period</strong></span><span>: Current and the future (2040)</span></p> <p><strong><span>Methods</span></strong><span>: We used ensemble bioclimatic models to evaluate drivers and directional patterns of future change in the distributions of 66 North American Beringian and Amphi-Beringian species currently occurring in Alaska and the Yukon. We explored the spatial pattern of species richness, losses and climate change refugia across the region.</span></p> <p><strong><span>Results</span></strong><span>: More than 80% of the species showed northward shifts in their latitudinal centroids under intermediate warming and are expected to shift their range northward by more than 140km on average by 2040. Additionally, more than 60% were projected to experience range contractions and up to 20% of the species would have the potential to expand their ranges by more than 100%. </span></p> <p><strong><span>Main conclusions</span></strong><span>: Suitable habitat for endemic species in northwest North America is expected to decline significantly, especially for species occupying the Arctic tundra. Although the models identified several potential refugia from future climate change, especially at high latitude and elevation, whether the species would be able to colonize new habitats on their own and/or capitalize sufficiently on in situ refugia remains a pertinent conservation question. </span></p>
Data from: Diversification at high latitudes: speciation of buntings in the genus Plectrophenax inferred from mitochondrial and nuclear markers
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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.