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152 results for “High Arctic”
Fig. 4 in Myxozoa in high Arctic: Survey on the central part of Svalbard archipelago
Fig. 4. Line drawing of Zschokkella siegfriedi, sutural view. Scale bar = 10 µm.
Fig. 8 in Myxozoa in high Arctic: Survey on the central part of Svalbard archipelago
Fig. 8. Line drawing of Sinuolinea arctica, sutural view. Scale bar = 10 µm.
Supplementary Figure S1. Life on the edge: ecological genetics of a high arctic insect species and its circumpolar counterpart
<p>Pairwise comparisons of F<sub>ST</sub> values between the 38 samples of <em>A. brevicorne</em> (samples 1 to 9) and <em>A. svalbardicum</em> (10 to 38). F<sub>ST</sub> values in yellow= from 0 to 0.049, in pale orange = from 0.05 to 0.099, in dark orange = from 0.1 to 0.499, in red = above 0.5. Origins of samples are given in Table 1.</p>
High Arctic late Paleocene and early Eocene dinoflagellate cysts; dinocyst results from IODP Expedition 302 (ACEX)
<p>This dataset includes the raw palynological data, notably dinoflagellate cyst assemblages, including 38 plates with high-resolution light microscope photos and 3 plates with SEM photos, from upper Paleocene and lower Eocene strata recovered from Lomonosov Ridge, Arctic Ocean, during IODP Expedition 302 (2004). The dataset forms the basis this publication: Appy Sluijs and Henk Brinkhuis, 2024: High Arctic late Paleocene and early Eocene dinoflagellate cysts . Journal of Micropaleontology 43 (2), 441-474. doi:10.5194/jm-43-441-2024.</p> <p>Please use Version 4 for all of the datasets.</p>
Environmental change reduces body condition, but not population growth, in a high-arctic herbivore
Environmental change influences fitness-related traits and demographic rates, which in herbivores are often linked to resource-driven variation in body condition. Coupled body condition-demographic responses may therefore be important for herbivore population dynamics in fluctuating environments, such as the Arctic. We applied a transient Life-Table Response Experiment ('transient-LTRE') to demographic data from Svalbard barnacle geese (<i>Branta leucopsis</i>), to quantify their population-dynamic responses to changes in body mass. We partitioned contributions from direct and delayed demographic and body condition-mediated processes to variation in population growth. Declines in body condition (1980-2017), which positively affected reproduction and fledgling survival, had negligible consequences for population growth. Instead, population growth rates were largely reproduction-driven, in part through positive responses to rapidly advancing spring phenology. The virtual lack of body condition-mediated effects indicates that herbivore population dynamics may be more resilient to changing body condition than previously expected, with implications for their persistence under environmental change.
Data for: Unprecedented shift in Canadian High Arctic polar bear food web unsettles four millennia of stability
<p><span>Stable carbon (δ<sup>13</sup>C) and nitrogen (δ<sup>15</sup>N) isotope analysis was conducted on modern and archaeological polar bear bone collagen from the Canadian Arctic Archipelago to investigate potential changes in polar bear foraging ecology over four millennia. Polar bear </span><span>δ<sup>13</sup>C</span><span> values showed a significant decline in the modern samples relative to all archaeological time-bins, indicating a disruption in the sources of production that support the food web, occurring after the Industrial Revolution. The trophic structure, indicated through </span><span>δ<sup>15</sup>N</span><span>, remained unaltered throughout all time periods. The lower </span><span>δ<sup>13</sup>C</span><span> observed in the modern samples indicates a change in the relative importance of pelagic (supported by open-water phytoplankton) over sympagic (supported by sea ice-associated algae) primary production. The consistency in polar bear </span><span>δ<sup>13</sup>C</span><span> through the late Holocene includes climatic shifts such as the Medieval Warm Period (MWP, A.D. 950–1250) and the early stages of the Little Ice Age (LIA, A.D. 1300–1850). These findings suggest that polar bears inhabit a food web that is more pelagic and less sympagic today than it was through the Late Holocene. We suggest that modern, anthropogenic warming has already affected food web structure in the Canadian Arctic Archipelago when modern data are contextualized with a deep time perspective.</span></p>
Late summer transition from a free-tropospheric to boundary layer source of Aitken mode aerosol in the high Arctic, model data
<p>This dataset contains model output that was used in the publication "Late summer transition from a free-tropospheric to boundary layer source of Aitken mode aerosol in the high Arctic" (Price et al., 2022, in prep).</p> <p> </p> <p>The output is from the UK Earth System Model run in atmosphere-only configuration at N96 resolution. Output is between September 2016 - December 2018 and is given variously as 3D monthly means, surface 3-hourly means, and 3D 2-hourly instantaneous values, depending on the variable in question.</p>
Enhanced methane emissions driven by glacial retreat in the high Arctic
<p>Methane concentration data of proglacial groundwater springs supporting the publication 'Enhanced methane emissions driven by glacial retreat in the high Arctic.' The data also includes icing depth and area measurements. In addition, we include fjord surface methane concentrations adjacent to marine-terminating glaciers.</p>
Data from: Movement diversity and partial sympatry of coastal and Northeast Arctic cod ecotypes at high latitudes
<p>Movement diversity within species represent an important, but often neglected, component of biodiversity that affects ecological and genetic interactions, as well as the productivity of exploited systems. By combining individual tracking data from acoustic telemetry with novel genetic analyses, we describe the movement diversity of two Atlantic cod <em>Gadus morhua</em> ecotypes in two high-latitude fjord systems: the highly migratory Northeast Arctic cod (NEA cod) that supports the largest cod fishery in the world, and the more sedentary Norwegian coastal cod, which is currently in a depleted state. As predicted, coastal cod displayed a higher level of fjord residency than NEA cod. Of the cod tagged during the spawning season, NEA cod left the fjords permanently to a greater extent and earlier compared to coastal cod, which to a greater extent remained resident and left the fjords temporarily. Despite this overall pattern, horizontal movements atypical for the ecotypes were common with some NEA cod remaining within the fjords year-round and some coastal cod displaying a low fjord fidelity. Fjord residency and exit timing also differed with spawning status and body size, with spawning cod and large individuals tagged during the feeding season more prone to leave the fjords and earlier than non-spawning and smaller individuals. While our results confirm a lower coastal dependency for NEA cod, they highlight a movement diversity within each ecotype and sympatric residency between ecotypes, previously undetected by population-level monitoring. This new knowledge is relevant for the management, which should base their fisheries advice for these interacting ecotypes on their habitat use and seasonal movements.</p>
Experimentally increased snow depth affects High Arctic microarthropods inconsistently over two consecutive winters
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Species' traits modulate rapid changes in flight time in high-Arctic muscid flies under climate change
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Breakpoint phenological responses in high-Arctic arthropods
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Data from: Plant cover changes drive plant and soil carbon pool responses in High Arctic dry heath exposed to decades of experimentally increased summer rain and nutrient addition
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Towards rainy high Arctic winters: how experimental icing and summer warming affect tundra plant phenology, productivity and reproduction
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Environmental change reduces body condition, but not population growth, in a high-arctic herbivore
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Data from: Movement diversity and partial sympatry of coastal and Northeast Arctic cod ecotypes at high latitudes
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Data for: Unprecedented shift in Canadian High Arctic polar bear food web unsettles four millennia of stability
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Data from: Climate synchronises shrub growth across a high-arctic archipelago: contrasting implications of summer and winter warming
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Long-term low-level nutrient additions significantly impact a low arctic mesic tundra plant community, but species responses differ from high-level fertilization: Implications for predicting climate warming impacts
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Exploring 4200 years of mercury variation in the antlers of high-Arctic wild reindeer
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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)
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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.