Walter Finsinger, Christoph Schwörer, Oliver Heiri, César Morales‐Molino, Adriano Ribolini, Thomas Giesecke, Jean Nicolas Haas, Petra Kaltenrieder, Enikö K. Magyari, Cesare Ravazzi, Juan Manuel Rubiales Jiménez, Willy Tinner,
... ecology of a tree glacial refugium on a nunatak with a view on Alpine glaciers'. The questions ... 2200 m above sea level (asl) on a nunatak (a mountain top or peak emerging from or ... further provided evidence of fire occurrence on the nunatak during the LGM, which they suggest demonstrates that ' ... g. Lüdi, 1950), the occurrence of trees on nunataks in the past is a reasonable hypothesis. However, ... Körner, 2003). Claiming an LGM refugium on a nunatak for tree species in modern treeline environments requires ...
Tópico(s): Botany and Plant Ecology Studies
2018 - Wiley | New Phytologist
María Ingimarsdóttir, Jörgen Ripa, Ólöf Birna Magnúsdóttir, Katarina Hedlund,
... study, we investigated primary food web assembly on nunataks (ice-free areas) in a retreating glacier in Iceland. Nunataks enable studies that take into account both the ... collected on sites of different age on five nunataks younger than 70 years, as well as the youngest parts of one old nunatak. The youngest sites had no vegetation and were ... cover and site age but also differed among nunataks. To investigate whether or not the assembly of ... vorliegenden Studie untersuchten wir den primären Nahrungsnetzaufbau auf Nunataks (eisfreie Flächen) inmitten eines zurückweichenden Gletschers auf Island. ...
Tópico(s): Ecology and Vegetation Dynamics Studies
2013 - Elsevier BV | Basic and Applied Ecology
Martim Mas e Braga, Richard S. Jones, Jennifer C. H. Newall, Irina Rogozhina, Jane Lund Andersen, Nathaniel A. Lifton, Arjen P. Stroeven,
... where ice flows around bedrock summits (i.e. nunataks) and through outlet glaciers. The ability of ice ... elevation change, which has been constrained empirically at nunataks and along margins of outlet glaciers using cosmogenic ... by modelling ice flow around and between idealised nunataks during periods of imposed ice sheet thinning. We find that, for realistic Antarctic conditions, a single nunatak can exert an impact on ice thickness over ... bedrock exposure upstream relative to downstream of a nunatak summit. A nunatak elongated transversely to ice flow ...
Tópico(s): Climate change and permafrost
2021 - Copernicus Publications | The cryosphere
Da Pan, Karl Hülber, Wolfgang Willner, Gerald M. Schneeweiss,
... beyond to lowland refugia) or to interior refugia (nunataks). However, nunatak survival remains controversial as it relies solely on ... of glacial survival: (a) peripheral survival only, (b) nunatak survival only and (c) peripheral plus nunatak survival. In P. asplenifolia the peripheral plus nunatak survival hypothesis was supported by Bayes factors (BF> ... not be unambiguously distinguished from the peripheral plus nunatak survival hypothesis (BF = 5.58). These results are ... C. fuliginosa ]). Although the persistence of plants on nunataks during glacial periods has been debated and studied ...
Tópico(s): Genetic diversity and population structure
2019 - Wiley | Molecular Ecology
Tina Jørgensen, Kurt H. Kjær, James Haile, Morten Rasmussen, Sanne Boessenkool, Kenneth Geving Andersen, Éric Coissac, Pierre Taberlet, Christian Brochmann, Ludovic Orlando, M. Thomas P. Gilbert, Eske Willerslev,
Abstract Nunataks are isolated bedrocks protruding through ice sheets. They vary in age, but represent island environments in ‘oceans’ ... 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 ... investigated the changes in plant composition at these nunataks using both the results of surveys of the ... meta‐barcoding of plant DNA recovered from the nunatak sediments ( sed aDNA). Our results show that several ... are described from earlier vegetation surveys on the nunataks (in 1878, 1967 and 2009). In 1967, a ...
Tópico(s): Isotope Analysis in Ecology
2011 - Wiley | Molecular Ecology
Teal R. Riley, Michael J. Flowerdew, R. J. Pankhurst, Ian Millar, Martin J. Whitehouse,
... dating is presented here from the Mesoproterozoic Haag Nunataks gneiss complex of West Antarctica where the dominant ... relationships, the main phase of deformation at Haag Nunataks is thought to have developed prior to the ... of a magnetic domain shared with the Haag Nunataks crustal block. Core zircon ages of ~2470 Ma ... rules out any potential correlation with the Haag Nunataks gneiss complex. The magmatic precursors of the Haag Nunataks orthogneisses were emplaced in a juvenile arc setting. ... deformation events. The later magmatic events at Haag Nunataks at ~1060 Ma are more closely associated with ...
Tópico(s): High-pressure geophysics and materials
2020 - Elsevier BV | Precambrian Research
Stefan Bernstein, A. Graham Leslie, A.K Higgins, C. Kent Brooks,
... alkaline ultrabasic lavas which occur in the remote Nunatak Region of Northeast Greenland between latitudes 73°45′ ... hydrous nature of the parental magma. Chemically, the Nunatak Region volcanics are rich in incompatible elements as ... melilitites from most other settings, those from the Nunatak Region have lower Al2O3, and higher FeO and ... it is suggested that volcanic rocks of the Nunatak Region formed from low degrees of mantle melting ( ... thick cratonic lithosphere. Trace-element profiles of the nunatak lavas suggest recycled oceanic crust as an important ...
Tópico(s): Geological Studies and Exploration
2000 - Elsevier BV | Lithos
Paul A. Doubleday, David I. M. Macdonald, P.A.R. Nell,
... strata are assigned to the newly defined Selene Nunatak Formation (?Bathonian) and Atoll Nunataks Formation (?Bathonian-Tithonian) within the Fossil Bluff Group. The Selene Nunatak Formation contains variable thicknesses of conglomeratesand sandstones, predominantly ... is conformably overlain by the1 km thick Atoll Nunataks Formation, characterized by thinly-bedded mudstones and silty ... transgression followed by trench-slope deposition. The Atoll Nunataks Formation marks a phase of subsidence, possibly in ...
Tópico(s): Geological and Geochemical Analysis
1993 - Cambridge University Press | Geological Magazine
Cédric Dentant, Bradley Z. Carlson, Nicolas Bartalucci, Arthur Bayle, Sébastien Lavergne,
... intense vegetation changes in alpine regions. High-elevation nunataks, that is bedrock islands protruding from glaciers with ... exception. Yet the consequences of climate change on nunatak vegetation remain relatively unexplored. Here, we report findings ... of historical plant surveys carried out on six nunataks situated between 2180 m a.s.l. and ... species richness for the lowest and least isolated nunataks, which contributed to a strong signal of vegetation ... vegetation composition in the highest and most isolated nunataks, an increase of plant species associated with non- ...
Tópico(s): Geology and Paleoclimatology Research
2023 - Société botanique de France | Botany Letters
... Sr whole-rock analyses are reported for Haag Nunataks, Mount Woollard, the Whitmore Mountains, the Pirrit and Nash hills, and Pagano Nunatak. For Haag Nunataks, three isochrons for gneisses and later aplogranite and ... Ma, Nash Hills 175±8 Ma, and Pagano Nunatak 175±8 Ma. Initial 87Sr/86Sr ratios of ... involved in magma generation. The dolerite of Lewis Nunatak is shown by its Rb, Sr, and 87Sr/ ...
Tópico(s): Geochemistry and Geologic Mapping
2011 - American Geophysical Union | Geophysical monograph
Gerald M. Schneeweiss, Peter Schönswetter,
... like areas protruding above the ice-sheet, socalled nunataks, or whether they did so in peripheral nonglaciated ... temperate mountain ranges such as the European Alps nunatak survival needs to be only rarely invoked to ... studies in this issue show, depreciation of the nunatak hypothesis is, however, not warranted. In this issue ... time in Arctic plants, in situ survival on nunataks. In an entirely different geographic setting and on ... parts of the last glaciation in situ on nunataks.
Tópico(s): Ecology and Vegetation Dynamics Studies
2011 - Wiley | Molecular Ecology
Sebastian H. Mernild, Birger Ulf Hansen, Bjarne Holm Jakobsen, Bent Hasholt,
... 1998–2006 and in the glacier area (Station Nunatak 515 m a.s.l.)for 1994–2006. ... 5 W m−2 y−1, at the nunatak and decreasing values, averaging 1.4 Wm−2 ... which is about 10% lower than at Station Nunatak, and is probably caused by increasing and higher ... by 0.10.°C y−1 at the nunatak and by 0.05°C y−1 at ... period of 64 days is observed at the nunatak. The coastal area is highly dominated by air ... 851 mm w.eq. y−1 at the nunatak (solid precipitation: 80%, mixed: 6%, and liquid: 14%) ...
Tópico(s): Arctic and Antarctic ice dynamics
2008 - Taylor & Francis | Geografisk Tidsskrift-Danish Journal of Geography
Aage Paus, Gaute Velle, Jorunn Larsen, Atle Nesje, Øyvind Lie,
... reveals for the first time biostratigraphical evidence of nunataks emerging from the Late Weichselian ice-sheet in ... less permanent ice-cover. The existence of Lateglacial nunataks indicates a thin and multi-domed Lateglacial ice- ... Scandinavia. Early migration of arctic-alpine plants to nunataks could explain their centric distribution in S Norway. Furthermore, vegetation establishment on the Flåfatet Lateglacial nunatak indicates that S Norway could have been vegetated by successions along the retreating ice from alpine nunataks and from coastal and southern areas. The upland ...
Tópico(s): Pleistocene-Era Hominins and Archaeology
2005 - Elsevier BV | Quaternary Science Reviews
Ivana Stehlik, Jakob Schneller, Konrad Bachmann,
... have been discussed: the tabula rasa and the nunatak hypotheses. Eritrichium nanum (L.) Gaudin (Boraginaceae) is a ... plants, for which in situ glacial survival on nunataks is ecologically possible. By investigating 20 populations of E. nanum of potential nunatak and peripheral refugial regions using amplified fragment length ... these, the Penninic and Rhaetic Alps, correspond to nunatak regions proposed in the biogeographic literature. Populations from ... with a modest decline among populations within specific nunatak regions and a negative correlation outside the genetic ...
Tópico(s): Plant Diversity and Evolution
2001 - Wiley | Molecular Ecology
... weathering zones. Mountain-top detritus is ubiquitous on nunataks that remained above the level of the last ... haematite and gibbsite are preferentially represented on former nunataks. The age and significance of mountain-top detritus ... it has formed over much longer timescales on nunataks above the last and possibly earlier ice sheets. ... Les couvertures de blocs existent partout sur les nunataks de la dernière calotte glaciaire; elles se trouvent ... la gibbsite soient préférentiellement présentes sur les anciens nunataks. L'âge et la signification des couvertures de ...
Tópico(s): Archaeology and ancient environmental studies
1998 - Wiley | Permafrost and Periglacial Processes
Ceridwen I. Fraser, Raisa Nikula, Daniel E. Ruzzante, Jonathan M. Waters,
... such as petrels, are able to nest on nunataks and fly to open-ocean polynyas to feed, ... such as petrels, are able to nest on nunataks and fly to open-ocean polynyas to feed, ... glacial survival. Small ice-free areas, such as nunataks (e.g., in alpine regions such as the ... 103-117Crossref PubMed Scopus (256) Google Scholar]. However, nunatak fauna are primarily continental and alpine specialised; therefore, ... throughout the LGM cannot easily be explained by nunataks [11Convey P. et al.Antarctic terrestrial life – challenging ...
Tópico(s): Marine Biology and Ecology Research
2012 - Elsevier BV | Trends in Ecology & Evolution
Andreas Engélen, Peter Convey, S. Ott,
Abstract Coal Nunatak is an ice-free inland nunatak located on southern Alexander Island, adjacent to the west coast of the ... the dominant crustose lichen species present on Coal Nunatak, and shows distinctive features in its life history ... the isolation and extreme environmental conditions of Coal Nunatak.
Tópico(s): Microbial Community Ecology and Physiology
2010 - Cambridge University Press | The Lichenologist
Björn Sohlenius, Sven Boström, Kjell Jonsson,
Nematodes, rotifers and tardigrades were collected on three nunataks (mountain peaks penetrating the ice sheet) in Vestfjella, on six nunataks in Heimefrontfjella and on the Schirmacher Oasis in ... 2001/02. Most samples were taken on the nunatak Basen in Vestfjella where the Swedish station Wasa ... highest number of species was found on the nunatak Basen. Rotifers, found in 66% of the samples, ... characteristics and to the geographic position of the nunatak. The communities are little organised and the distribution ...
Tópico(s): Biocrusts and Microbial Ecology
2004 - Elsevier BV | Pedobiologia
Hilary H. Birks, H. J. B. Birks,
... needs to be explored further (e.g. 29). Nunataks The hypothesis that plants survived the glacial periods on nunataks and coastal refugia in Norway sparked much heated ... unstable ground ( 7). Although direct evidence from the nunataks themselves is lacking, it is unnecessary to propose ... Birks, H. H. (1994b) Plant macrofossils and the nunatak theory of per-glacial survival. Dissertationes Botanicae, 234, ... 1993) Is the hypothesis of survival on glacial nunataks necessary to explain the present-day distribution of ...
Tópico(s): Botany and Plant Ecology Studies
2000 - Wiley | Journal of Biogeography
... the southeast at least as far northwest as Nunatak Fiord east of Yakutat Bay, a distance of ... scarps were formed on the south shore of Nunatak Fiord. A displacement in which the southwest side ... Lake. Continuity of breakage between Palma Bay and Nunatak Fiord cannot be demonstrated positively because ice and ... in general appearance to those formed on the Nunatak at Nunatak Fiord both in this earthquake and in the ...
Tópico(s): Seismic Waves and Analysis
1960 - Seismological Society of America | Bulletin of the Seismological Society of America
Joanna Ewa Szafraniec, Wojciech Dobiński,
... type of vertical profile. To this end, seven nunataks across the island were analysed using Landsat satellite ... software. Over the last 24–31 years, new nunataks gradually emerged from the ice cover at an ... the slope was positively correlated with the average nunatak elevation, reaching a value of approximately 10,000 ...
Tópico(s): Geology and Paleoclimatology Research
2020 - Multidisciplinary Digital Publishing Institute | Geosciences
M. J. Genge, Matthias Van Ginneken, Martin D. Suttle, R. P. Harvey,
... micrometeorites (MMs) in a supraglacial moraine at Larkman Nunatak in the Grosvenor Mountains of the Transantarctic Range ... of the interpretation of microtektites as Australasian, Larkman Nunatak deposit is the oldest known supraglacial moraine and ... by the specific ice flow conditions at Larkman Nunatak explains its longevity and provides a new type ...
Tópico(s): Cryospheric studies and observations
2018 - Wiley | Meteoritics and Planetary Science
Kevin R. Evans, L. W. McKenna, Bruce S. Lieberman, Wesley Donald Weichert, Kenneth G. MacLeod,
Abstract Postel Nunatak in the Patuxent Range has been previously mapped as Nelson Limestone but there was no biostratigraphic support for ... now. We confirm that limestone exposures at Postel Nunatak are at least partly correlated with the Nelson ... Because the upper and lower contacts at Postel Nunatak are covered by snow and ice, the relationship ...
Tópico(s): Polar Research and Ecology
2017 - Cambridge University Press | Antarctic Science
Christopher Carcaillet, Olivier Blarquez,
... in lake sediments from the western Alps. Two nunataks were investigated, both with lacustrine sediments covering the ... and the Lateglacial, fires occurred only on the nunatak sheltering woody plants. Cembra pine (Pinus cembra) and ... thus evidencing a biological refugium and supporting the nunatak theory. We highlighted a long-term relationship between ...
Tópico(s): Tree-ring climate responses
2017 - Wiley | New Phytologist
John P. Craddock, Mark D. Schmitz, James L. Crowley, Jeremiah Larocque, R. J. Pankhurst, N. Juda, Alexandros Konstantinou, Bryan Storey,
... Nash Hills (177.4–177.3 Ma), Linck Nunatak (175.3 Ma), Pagano Nunatak (174.8 Ma), and the Pirrit Hills (174. ... from the Whitmore Mountains (200 ± 5 Ma), Linck Nunatak (180 ± 4 Ma), Pagano Nunatak (174 ± 4 Ma), and the Pirrit Hills (168 ± ...
Tópico(s): High-pressure geophysics and materials
2016 - Geological Society of America | Geological Society of America Bulletin
Aurora Stenmark, Lars Robert Hole, P. B. Voss, Joachim Reuder, Marius O. Jonassen,
Abstract The effects of nunataks on temperature profiles and wind patterns are studied using simulations from the Weather Research and Forecasting model. Simulations are compared ... acquired during the 4 day simulation period. The nunataks are radiatively heated during daytime, and free convection ... available over the ice field upwind to the nunatak.
Tópico(s): Climate variability and models
2014 - Wiley | Journal of Geophysical Research Atmospheres
Martin Haase, Susanne Esch, Bernhard Misof,
... the Pleistocene glaciations in isolated Alpine habitats like nunataks throughout the Alps. Alternatively, the depressed shells could ... the Totes Gebirge lay under glaciers offering only nunataks as possible refugia. Using geometric morphometrics and phylogenetic ... there was evidence for in situ survival on nunataks during the Pleistocene and (4) if the ancestral ... entire clades unique to the Totes Gebirge indicating nunatak survival of snail populations. Our data also suggest ...
Tópico(s): Study of Mite Species
2013 - Oxford University Press | Journal of Molluscan Studies
Gregor A. Wachter, Wolfgang Arthofer, Thomas Dejaco, Lukas J. Rinnhofer, Florian M. Steiner, Birgit C. Schlick‐Steiner,
... studies that confirmed animal survival on A lpine nunataks, that is, ice‐free summits surrounded by glaciers, ... data indicate survival on both peripheral and central nunataks, the latter suggesting that refugia in the centre ... inferred parthenogenesis may have been essential for central nunatak survival, but may pose a serious threat for ...
Tópico(s): Species Distribution and Climate Change
2012 - Wiley | Molecular Ecology
Maria Rosaria Renna, Massimo Tiepolo, Riccardo Tribuzio,
... zircon from a quartz gabbro of the Varney Nunatak intrusion (central Victoria Land, Antarctica). Back-scattered electron ... upper crustal rocks. The gabbroic rocks of Varney Nunatak are associated with peraluminous granites and late basalt ... 7.7 to −6.8) of the Varney Nunatak association are similar to those of other igneous ...
Tópico(s): Geochemistry and Geologic Mapping
2011 - Elsevier BV | European Journal of Mineralogy
Konrad Lohse, James A. Nicholls, Graham N. Stone,
... small ice-free islands of habitat, so-called nunataks, or whether glacial survival was restricted to larger ... mountain range were surrounded by the icesheet as nunataks during the last glacial maximum, southern areas remained ... by a contrasting model of prolonged persistence of nunatak populations. We find that (i) only three populations ...
Tópico(s): Ecology and Vegetation Dynamics Studies
2010 - Wiley | Molecular Ecology