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A Revised Timescale for Human Evolution Based on Ancient Mitochondrial Genomes
BACKGROUND Recent analyses of de novo DNA mutations in modern humans have suggested a nuclear substitution rate that is approximately half that of previous estimates based on fossil calibration. ThisExpand
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Arctic ecosystems in a changing climate : an ecophysiological perspective
F.S. Chapin III, R.L. Jefferies, J.F. Reynolds, G.R. Shaver, and J. Svoboda, Arctic Plant Physiological Ecology: A Challenge for the Future. The Arctic System: B. Maxwell, Arctic Climate: PotentialExpand
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Vascular plant communities of a polar oasis at Alexandra Fiord (79° N), Ellesmere Island, Canada
A cluster analysis was used to apportion 136 stands in a High Arctic lowland among six vascular plant community types. These communities are described on the basis of the average prominence values ...
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Polar deserts, their plant cover and plant production in the Canadian High Arctic
A total of 41 stands was sampled for species composition and 29 of these stands for plant standing crop and net annual production at 7 sites on 6 arctic islands. Fourteen additional sites on 10Expand
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Pleistocene Mitochondrial Genomes Suggest a Single Major Dispersal of Non-Africans and a Late Glacial Population Turnover in Europe
How modern humans dispersed into Eurasia and Australasia, including the number of separate expansions and their timings, is highly debated [1, 2]. Two categories of models are proposed for theExpand
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Little Ice Age temperature estimated by growth and flowering differences between subfossil and extant shoots of Cassiope tetragona, an arctic heather
Little ice age temperature estimated by growth and flowering differences between subfossil and extant shoots of Cassiope tetragona, an arctic heather.
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Pleistocene Mitochondrial Genomes Suggest a Single Major Dispersal of Non-Africans and a Late Glacial Population Turnover in Europe
Cosimo Posth,* Gabriel Renaud, Alissa Mittnik, Dorothée G. Drucker, Hélène Rougier, Christophe Cupillard, Frédérique Valentin, Corinne Thevenet, Anja Furtwängler, Christoph Wißing, Michael Francken,Expand
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Effects of fertilization on three tundra plant communities of a polar desert oasis
Three plant communities studied at a high arctic oasis on Ellesmere Island responded to nutrient addition. Response to nitrogen was greatest in the driest community and weaker in the more mesic andExpand
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Upper Palaeolithic and Mesolithic human fossils from Moravia and Bohemia (Czech Republic): some new 14C dates
In addition to reconstruction of the depositional context of the human fossils from Mladec and Koněprusy - Zlatý kůň, new 14C dates from sites with human fossils are published here, and discussed inExpand
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