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.
10
datasets available to search
ShareScore release 0.7.1
Dataset results
10 results for “Nunatak”
An explicit test of Pleistocene survival in peripheral versus nunatak refugia in two high mountain plant species
<p>Pleistocene climate fluctuations had profound influence on the biogeographic history of many biota. As large areas in higher latitudes and high mountain ranges were covered by glaciers, biota were forced either to peripheral refugia (and possibly beyond to lowland refugia) or to interior refugia (nunataks), but nunatak survival remains controversial as it solely relies on correlative genetic evidence. Here, we test the nunatak hypothesis using two high alpine plant species of contrasting pollination modes (insect-pollinated Pedicularis aspleniifolia and wind-pollinated Carex fuliginosa) in the European Alps, a geographic model system to study Pleistocene biogeography. Employing the iDDC (integrative distributional, demographic and coalescent) approach, which couples species distribution modelling, spatial and temporal demographic simulation and Approximate Bayesian Computation, we explicitly test three hypotheses of glacial survival: (1) peripheral survival only, (2) nunatak survival only, and (3) nunatak plus peripheral survival. In P. aspleniifolia the nunatak plus peripheral survival hypothesis was supported by Bayes Factors (BF > 100), whereas in C. fuliginosa the peripheral survival only hypothesis, though best supported, could not be unambiguously distinguished from the nunatak plus peripheral survival hypothesis (BF = 5.58). These results are consistent with current habitat preferences (P. aspleniifolia extends to higher elevations) and the potential for genetic swamping, i.e., replacement of local genotypes via hybridization with immigrating genotypes (expected to be higher in the wind-pollinated C. fuliginosa). Although the persistence of plants on nunataks during glacial periods has been debated and studied over decades, this is one of the first studies to explicitly test the hypothesis instead of solely using correlative evidence.</p>
An explicit test of Pleistocene survival in peripheral versus nunatak refugia in two high mountain plant species
Open the record for dataset details and reuse information.
Data from: Is the incidence of survival in interior Pleistocene refugia (nunataks) underestimated? Phylogeography of the high mountain plant Androsace alpina (Primulaceae) in the European Alps revisited
Open the record for dataset details and reuse information.
Data from: Islands in the ice: detecting past vegetation on Greenlandic nunataks using historical records and sedimentary ancient DNA meta-barcoding
Nunataks are isolated bedrocks protruding through ice sheets. They vary in age, but represent island environments in "oceans" of ice through which organism dispersals and replacements can be studied over time. The J.A.D. Jensen's Nunataks at the southern Greenland ice sheet are the most isolated nunataks on the northern hemisphere - some 30 km from the nearest biological source. They constitute around 2 km2 of ice-free land that was established in the early Holocene. We have investigated the changes in plant composition at these nunataks using both the results of surveys of the flora over the last 130 years, and through reconstruction of the vegetation from the end of the Holocene Thermal Maximum (5528±75 cal yr BP) using meta-barcoding of plant DNA recovered from the nunatak sediments (sedaDNA). Our results show that several of the plant species detected with sedaDNA are described from earlier vegetation surveys on the nunataks (in 1878, 1967 and 2009). In 1967, a much higher biodiversity was detected than from any other of the studied periods. While this may be related to differences in sampling efforts for the oldest period, it is not the case when comparing the 1967 and 2009 levels where the botanical survey was exhaustive. As no animals and humans are found on the nunataks, this change in diversity over a period of just 42 years must relate to environmental changes likely being climate-driven. This suggests that even the flora of fairly small and isolated ice-free areas reacts quickly to a changing climate.
FIGURE 2 in One century of vegetation change on Isla Persa, a nunatak in the Bernina massif in the Swiss Alps
FIGURE 2. Map of Russia and its six subunits as used in this catalogue. SR: Southern European Russia. CR: Central European Russia. NR: Northern European Russia. WS: Western Siberia. ES: Eastern Siberia. FS: Far Eastern Siberia. Map adapted from Lelej (2002).
FIGURE 1 in One century of vegetation change on Isla Persa, a nunatak in the Bernina massif in the Swiss Alps
FIGURE 1. Map of the Palaearctic region and its four subregions as used in this catalogue. EU: Europe. AF: Northern Africa. AS: Northern Asia. SA: Southwestern Asia.
FIGURE 3 in One century of vegetation change on Isla Persa, a nunatak in the Bernina massif in the Swiss Alps
FIGURE 3. Map of China (excluding Taiwan) and its seven subunits as used in this catalogue. NW: Northwestern China. NO: Northern China. NE: Northeastern China. WP: Western Chinese Plateau. SW: Southwestern China. CE: Central China. SE: Southeastern China. Map adapted from Lelej (2002).
Data from: Islands in the ice: detecting past vegetation on Greenlandic nunataks using historical records and sedimentary ancient DNA meta-barcoding
Open the record for dataset details and reuse information.
Data from: Pleistocene survival on central Alpine nunataks: genetic evidence from the jumping bristletail Machilis pallida
Mechanisms of survival during the Pleistocene glaciation periods have been studied for more than a century. Until now, molecular studies that confirmed animal survival on Alpine nunataks, i.e., ice-free summits surrounded by glaciers, were restricted to peripheral areas. Here, we search for molecular signatures of inner-Alpine survival of the narrow-endemic and putatively parthenogenetic Alpine jumping bristletail Machilis pallida combining mitochondrial and AFLP data from its three known populations. The mitochondrial data indicate survival on both peripheral and central nunataks, the latter suggesting that refugia in the centre of the Alpine main ridge were more widespread than previously recognised. Incongruences between mitochondrial and AFLP patterns suggest a complex evolutionary history of the species and may be explained via parallel fixation of parthenogenesis of different origins during the Last Glacial Maximum. We suggest that the inferred parthenogenesis may have been essential for central-nunatak survival, but may pose a serious threat for M. pallida in consideration of the present climatic changes.
Data from: Pleistocene survival on central Alpine nunataks: genetic evidence from the jumping bristletail Machilis pallida
Open the record for dataset details and reuse information.
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.