The "twilight" of the mammoth fauna in the Asiatic Arctic
Article Abstract:
The "twilight" of the mammoth fauna has been studied in the Asiatic Arctic. Using a large collection of mammal-bone radiocarbon data, histograms can be made with 1000-year intervals, based on 262 dates for assorted mammoth-period animals. A shift in biological habitats in the last 50,000 years can be seen in the continental and island areas. Until the middle of the Holocene the fauna was spread uniformly over the whole northern Asian territory. Then fauna went into marginal areas and components began to exhibit some quantitiative oscillations. Apparently climatic warming and increases in sea-levels were the primary causes of mammoth-fauna disappearance. Radiocarbon dating was used for this study, which was part of the Swedish-Russian Tundra Ecology -94 project.
Publication Name: Ambio
Subject: Environmental issues
ISSN: 0044-7447
Year: 1999
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A circumpolar study of arctic biodiversity: phylogeographic patterns in the Daphnia pulex complex
Article Abstract:
A circumpolar study of arctic biodiversity has been carried out with investigation of phylogeographic patterns in the Daphnia pulex complex, which includes asexual clones. D. pulex is a water flea, a freshwater crustacean, and the complex comprises several thousand distinct clones. They can be classified into two major lineage groups depending on molecular markers. Main groups and subgroups differ greatly in distribution and hybrids are common in two overlap zones in Northern Europe and Canada. Clonal diversity is as high in the Arctic as it in the temperate zone, if not more so. Genetic structure of all the subgroups is highly fragmented. The Arctic tundra is not a homogeneous biome of low biodiversity.
Publication Name: Ambio
Subject: Environmental issues
ISSN: 0044-7447
Year: 1999
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Morphometric variation in the true lemmings (Lemmus) from the Eurasian arctic
Article Abstract:
Morphometric variation, especially in cranial properties, has been studied in the true lemmings (Lemmus) of the Eurasian arctic as part of the Swedish-Russian Tundra Ecology -94 expedition. A multivariate approach was used with samples from populations at 11 sites in the summer of 1994. All studied populations can be grouped into four categories, two of which are island groups of the New Siberian Islands and Wrangel Island, and two of which are mainland groups, the western group and the eastern group with the Lena River as the dividing line.
Publication Name: Ambio
Subject: Environmental issues
ISSN: 0044-7447
Year: 1999
User Contributions:
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