The subfossil diatom flora of four geographically widely separated cores in Greenland
Diatoms in cores from four Greenland lakes are reported; one lake is situated in NE Greenland, two in NW Greenland, and one in W Greenland. All cores are of postglacial age, the earliest sample radiocarbon-dated to c. 8500 years B.P.; in each core the latest sample is taken a few cm below the lake b...
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Danish Polar Center/Museum Tusculanum Press
1990
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ftkbcopenhojs:oai:ojs.tidsskrift.dk:article/142391 2024-01-28T10:05:57+01:00 The subfossil diatom flora of four geographically widely separated cores in Greenland Foged, Niels 1990-01-10 application/pdf https://tidsskrift.dk/meddrgroenland_biosci/article/view/142391 eng eng Danish Polar Center/Museum Tusculanum Press https://tidsskrift.dk/meddrgroenland_biosci/article/view/142391/186057 https://tidsskrift.dk/meddrgroenland_biosci/article/view/142391 Meddelelser om Grønland. Bioscience; Vol. 30 (1989): Meddelelser om Grønland. Bioscience; 75 pp. Meddelelser om Grønland. Bioscience; Årg. 30 (1989): Meddelelser om Grønland. Bioscience; 75 pp. 0106-1054 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1990 ftkbcopenhojs 2024-01-03T23:58:33Z Diatoms in cores from four Greenland lakes are reported; one lake is situated in NE Greenland, two in NW Greenland, and one in W Greenland. All cores are of postglacial age, the earliest sample radiocarbon-dated to c. 8500 years B.P.; in each core the latest sample is taken a few cm below the lake bottom. Previously investigated cores from Greenland showed a gradual change of environmental pH from alkaline to faintly acid lacustrine environments. This is also the case at one of the two sites in NW Greenland, and in W Greenland the pH is initially alkaline but subsequently developing towards neutral and slightly below it. At Station Nord, NE Greenland, the pH is faintly alkaline. However, the data from the fourth lake, Qeqertat, NW Greenland is rather confusing, as the alkaline environment which seems to persist is suddenly interrupted three times by higher levels of acidity. The diatom flora consists predominantly of cosmopolitan species which are mostly recorded from the extant Greenland flora. In some aspects it represents a transition between the flora of northern Europe and North America. Most of the taxa are recorded from both regions, but some seem to be more common in Europe, whereas a few are more common, or previously only found in North America, especially Alaska. Some species of particular interest are commented upon, and photographs of selected species are included. Article in Journal/Newspaper Greenland Qeqertat Alaska Tidsskrift.dk (The Royal Library, Denmark) Fourth Lake ENVELOPE(-119.051,-119.051,62.583,62.583) Greenland Station Nord ENVELOPE(-16.663,-16.663,81.599,81.599) |
institution |
Open Polar |
collection |
Tidsskrift.dk (The Royal Library, Denmark) |
op_collection_id |
ftkbcopenhojs |
language |
English |
description |
Diatoms in cores from four Greenland lakes are reported; one lake is situated in NE Greenland, two in NW Greenland, and one in W Greenland. All cores are of postglacial age, the earliest sample radiocarbon-dated to c. 8500 years B.P.; in each core the latest sample is taken a few cm below the lake bottom. Previously investigated cores from Greenland showed a gradual change of environmental pH from alkaline to faintly acid lacustrine environments. This is also the case at one of the two sites in NW Greenland, and in W Greenland the pH is initially alkaline but subsequently developing towards neutral and slightly below it. At Station Nord, NE Greenland, the pH is faintly alkaline. However, the data from the fourth lake, Qeqertat, NW Greenland is rather confusing, as the alkaline environment which seems to persist is suddenly interrupted three times by higher levels of acidity. The diatom flora consists predominantly of cosmopolitan species which are mostly recorded from the extant Greenland flora. In some aspects it represents a transition between the flora of northern Europe and North America. Most of the taxa are recorded from both regions, but some seem to be more common in Europe, whereas a few are more common, or previously only found in North America, especially Alaska. Some species of particular interest are commented upon, and photographs of selected species are included. |
format |
Article in Journal/Newspaper |
author |
Foged, Niels |
spellingShingle |
Foged, Niels The subfossil diatom flora of four geographically widely separated cores in Greenland |
author_facet |
Foged, Niels |
author_sort |
Foged, Niels |
title |
The subfossil diatom flora of four geographically widely separated cores in Greenland |
title_short |
The subfossil diatom flora of four geographically widely separated cores in Greenland |
title_full |
The subfossil diatom flora of four geographically widely separated cores in Greenland |
title_fullStr |
The subfossil diatom flora of four geographically widely separated cores in Greenland |
title_full_unstemmed |
The subfossil diatom flora of four geographically widely separated cores in Greenland |
title_sort |
subfossil diatom flora of four geographically widely separated cores in greenland |
publisher |
Danish Polar Center/Museum Tusculanum Press |
publishDate |
1990 |
url |
https://tidsskrift.dk/meddrgroenland_biosci/article/view/142391 |
long_lat |
ENVELOPE(-119.051,-119.051,62.583,62.583) ENVELOPE(-16.663,-16.663,81.599,81.599) |
geographic |
Fourth Lake Greenland Station Nord |
geographic_facet |
Fourth Lake Greenland Station Nord |
genre |
Greenland Qeqertat Alaska |
genre_facet |
Greenland Qeqertat Alaska |
op_source |
Meddelelser om Grønland. Bioscience; Vol. 30 (1989): Meddelelser om Grønland. Bioscience; 75 pp. Meddelelser om Grønland. Bioscience; Årg. 30 (1989): Meddelelser om Grønland. Bioscience; 75 pp. 0106-1054 |
op_relation |
https://tidsskrift.dk/meddrgroenland_biosci/article/view/142391/186057 https://tidsskrift.dk/meddrgroenland_biosci/article/view/142391 |
_version_ |
1789332535757504512 |