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40 results for “Deglaciation”
Holocene deglaciation drove rapid genetic diversification of Atlantic walrus
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Founder takes more: interspecific competition affects range expansion of North American mammals into deglaciated areas
<p class="MSBody"><b>Aim</b></p> <p class="MSBody">I assess the impact of interspecific competition on species post-glacial range expansions into previously glaciated areas. I hypothesize that expansion of one species (the founder) after the Last Glacial Maximum (LGM) into areas that were glaciated has hindered expansion of its competitor (the successor). If true, I predict that range and niche sizes of two congeners are more disproportionate within the previously glaciated areas (i.e., the areas of postglacial expansion) than within areas that were not glaciated. I also predict that niche partitioning is reduced within previously glaciated areas. If true, range and climatic niche overlap of two congeners is smaller in the previously glaciated areas than in non-glaciated areas. </p> <p class="MSBody"><b>Location</b></p> <p class="MSBody">North America</p> <p class="MSBody"><b>Taxon</b></p> <p class="MSBody">Non-volant mammals</p> <p class="MSBody"><b>Methods</b></p> <p class="MSBody">I calculate species range size for 87 congeneric species pairs and climatic niche hypervolume for 71 pairs, separately for areas that were and were not glaciated during the LGM. I then compare (a) range and climatic niche size ratio and (b) range and climatic niche overlap for each species pair between areas that were and were not glaciated using a paired t-test.</p> <p class="MSBody"><b>Results </b></p> <p class="MSBody">Congeneric species pairs exhibit more disproportionate range areas and climatic niche hypervolumes and smaller range and climatic niche overlap within previously glaciated areas in comparison with areas that were not glaciated during the LGM.</p> <p class="MSBody"><b>Main conclusions</b></p> <p class="MSBody">Interspecific competition has likely hindered postglacial range expansion of some species into deglaciated areas. Similarly to the founder effect documented on the intraspecific level, the founder species may hinder the expansion of the successor species. Consequently, one species may expand over very large areas whereas its competitor may expand very little or not at all. Additionally, niche partitioning within the deglaciated areas may be reduced as the founder expands and fills biotopes that would otherwise be utilized by its competitor.</p>
Beringia megafauna extinctions during last deglacial climatic transitions
<p>The causes of last deglacial megafauna extinctions in Beringia remain highly debated, with evidence pointing to climate change, human hunting, or a combination of both. One key uncertainty is associated with the current poor understanding of regional climate evolution in part due to lack of integrated proxy-model analyses, though studies of the globe repeatedly documented large climate shifts of this time period. Here, we present terrestrial temperature and moisture reconstructions since the Last Glacial Maximum by magnetic and geochemical measurements in a sediment core collected from the northern shelf of the Bering Sea. We reconstruct the marine-terrestrial environmental teleconnections, corresponding to warmer and wetter conditions between 14,700 and 13,500 years ago associated with the Bølling/Allerød interstadial (BA). Our climate model analysis confirms proxy data and attributes the climatic amelioration to increased regional heat and moisture transport from the low-latitude North Pacific Ocean, accompanied by a northward expansion of the Westerly Jet. The increased temperature and moisture availability facilitated the expansion of shrub tundra to the expanse of the previously dominating grass and forb rangelands, which appears to lead to the disappearance of megafauna grazers during the onset of BA. Our findings emphasize a crucial role of climate-driven habitat losses in contributing to the turnover in mammal communities across the last deglacial Beringia.</p>
North American Deglacial Isochrones, version 1 (NADI-1)
<p>Mapping files from the North American Deglaciation Isochrones (NADI-1), which span 25 to 1 ka for the Innuitian, Cordilleran, and Laurentide ice sheets. Included in the zip folder are 588 files in total: 49 time-steps x 3 files per timestep (optimal/min/max) = 147 individual shapefiles and their respective 147 .prj, .dbf and .shx files.</p>
The deglaciation of the Pyrenees through the 47 ka record of Pllan d'Están paleolake (Ésera valley)
<p>The last deglaciation in the Pyrenees was a complex period with several glacier advances associated with rapid climate changes which differ in terms of timing and intensity. The 46.7 ka lacustrine sequence of Pllan d’Están paleolake (1,840 m a.s.l.) provides new information about that deglaciation period for the first time in the Ésera valley. The multiproxy analysis (sedimentological, geochemical and biological indicators) constrained with a robust chronological model, enabled the longest reconstruction of the glacier evolution, climate and environmental change made in the Pyrenees to date. This lacustrine sedimentary sequence (4.9 m) is composed of banded to finely laminated silts with few intercalations of massive sections where carbonatic, siliciclastic and organic facies appear from the bottom to the top characterizing environmental changes from a subglacial/proglacial lake to the current peatbog. A cold and glacier-dominated period from 46.7 to 15.9 ka BP was interrupted by a warmer period spanning from 38.2 to 34.8 ka. The vegetation succession determined by the palynological analyses is similar to other Pyrenean valleys but dates the onset of mesophyte expansion at 13.8 ka BP during the Allerød, pointing to a difference with other European sequences where temperate forest development took place earlier, associated with the Bølling period. The colder conditions of the Younger Dryas (13-34 11.7 ka) have been detected from cold tolerant diatom taxa that preceded a peatbog development during the Holocene (11.7 ka BP – present-day). These results, together with previously studied Pyrenean sequences, allow characterizing past environmental changes during last deglaciation phases in southern Europe.</p>
The isotopic composition of the French Illimani ice core in the Bolivian Andes supports the east-west South American precipitation dipole from the last deglaciation to the mid-Holocene
<p>Isotopic composition (deuterium and deuterium excess) of the French Illimani ice core drilled in 1999 with a revised dating detailed in the following manuscript:</p> <p>Françoise Vimeux and Amaëlle Landais, 2025. The isotopic composition of the French Illimani ice core in the Bolivian Andes supports the east-west South American precipitation dipole from the last deglaciation to the mid-Holocene. Quaternary Science Reviews 347, https://doi.org/10.1016/j.quascirev.2024.109098.</p>
A deglacial hazard cascade exemplified by the landslide, tsunami and outburst flood at Elliot Creek, Southern Coast Mountains, British Columbia, Canada
<p>We describe and model the evolution of a recent landslide and outburst flood in the southern Coast Mountains, British Columbia, Canada. About 18 Mm<sup>3</sup> of rock descended 1000 m from a steep valley wall and traveled across the toe of a glacier before entering a 0.6 km<sup>2</sup> glacier lake and producing a >100-m high wave. Water overtopped the lake outlet and scoured a 10-km long channel before depositing debris on a 2 km<sup>2</sup> fan below the lake outlet. Floodwater, organic detritus, and fine sediment entered a fjord where it produced a 70-km long turbidity current and altered turbidity, water temperature, and water chemistry for weeks. The outburst flood destroyed forest and culturally significant salmon spawning and rearing habitat. Physically based models of the landslide, the displacement wave, and the flood provide real-time simulations of the event and can improve understanding of similar hazard cascades and the risk they pose.</p>
Influence of Orbital Forcing on the Snowball Earth Deglaciation
<p>CAM3&CLM3 simulation results that support the findings of this study are archived here.</p>
Enhanced North Pacific subpolar gyre circulation led to hypoxia events during last deglacial warm periods
<p>Original data in "Enhanced circulation of the North Pacific subpolar gyre leading to an anoxic event during the Last Glacial Warm Period"。</p>
Deglacial temperature and carbonate saturation state variability in the tropical Atlantic at Antarctic Intermediate Water Depths
<p>Data and R script repository for the manuscript "Deglacial temperature and carbonate saturation state variability in the tropical Atlantic at Antarctic Intermediate Water Depths" (Oppo et al., 2023)</p>
Dataset for paper "Equatorial Pacific sea-air CO2 exchange modulated by upper ocean circulation during the last deglaciation" submittted to Geophysical Research Letters
<p>Data of the <em>p</em>CO<sub>2</sub> and ∆<em>p</em>CO<sub>2_sw-atm</sub> from <em>G. ruber</em> 𝛿<sup>11</sup>B, 𝛿<sup>11</sup>B of <em>G. sacculifer</em>, 𝛿<sup>18</sup>O of <em>G. ruber</em> and <em>P. obliquiloculata</em>, ∆𝛿<sup>18</sup>O<sub>P-G</sub>, bulk 𝛿<sup>15</sup>N in core MD10-3340 (0º31.0’S, 128º43.5’E, water depth 1094 m), and upper Ocean Heat Content (OHC) in the Western Equatorial Pacific (WEP).</p>
Founder takes more: interspecific competition affects range expansion of North American mammals into deglaciated areas
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Data from: Response of deep-sea biodiversity to abrupt deglacial and Holocene climate changes in the North Atlantic Ocean
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A deglacial hazard cascade exemplified by the landslide, tsunami and outburst flood at Elliot Creek, Southern Coast Mountains, British Columbia, Canada
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The LGM and the Last Deglaciation lake expansion and its corresponding cold/wet climate change mode in the northern Qinghai-Tibet Plateau
<p><strong>SGH sediment dataset, Simulations of TRACE and PMIP3.</strong></p>
Rapid northwestward extension of the East Asian summer monsoon over the last deglaciation: evidence from mollusk record
<p>The magnitude and rate of spatial expansion of the East Asian summer monsoon (EASM) rain belt as the climate warms remains unclear. Existing assessments still lack the ecological records that are more sensitive to the EASM rainfall to quantify the spatial extension during the past warming scenarios. Here, the spatiotemporal extension of EASM intensity since the last glacial maximum (LGM) is reconstructed using six well-dated mollusk fossil sequences from Chinese loess sections located at the northern part of the EASM. The abundant occurrence of typical dominant mollusk species indicative of EASM intensity gradually delayed from southeast to northwest since the last deglacial warming. The estimated expansion rate of EASM intensity accelerated markedly during the ~12-9 ka (~50 km/ka), which corresponded with the early-Holocene rapid warming period, shifting northwestward ~150 km compared to present. This imply that northern fringe of EASM in northern China will become wetter as the climate warms.</p>
Data for Millennial-scale precipitation and chemical weathering variations since the last deglaciation recorded by the northwestern South China Sea sediments
<p>Magnetic, DRS and Geochemical data sets of core SCS-02</p>
Rapid northwestward extension of the East Asian summer monsoon over the last deglaciation: evidence from mollusk record
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Plant–soil interactions in a deglaciated landscape: Roots reflect environmental severity
<p>Supported data set of basic soil properties and Arctic willow roots and leaves elements and substances composition for the article "Plant–soil interactions in a deglaciated landscape: Roots reflect environmental severity" submitted to Scandinavian Journal of Forest Research.</p>
Hydrological data from the Dajiuhu basin, central eastern China, during the last deglaciation
<p>This is the original data used in the manuscript titled "Hydrological changes related to ENSO-like states during the last deglaciation in central eastern China" which has been accepted by Paleoceanography and Paleoclimatology. This excel includes calendar age, Rb/Sr, Zr/Rb, median grainsize and other data that used to evaluate hydrological changes in the Dajiuhu basin. </p>
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