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Nyhedsbrev
Print siden
Fredskild, Bent
The Holocene vegetational development of Tugtuligssuaq and Qeqertat, Northwest Greenland
1985, 20 sider Illustreret 19 x 26,5 cm 6 tavler i lomme
ISBN 978-87-635-1166-7
Serie:
Monographs on Greenland | Meddelelser om Grønland, vol. 246
ISSN 0025-6676
Serie:
Geoscience, vol. 14
ISSN 0106-1046
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Holocene pollen-and macrofossil diagrams from three high arctic lakes in Northwest Greenland are presented, and based on these the radiocarbon dated palaeovegetation
zones (PV zones) are described. Two of the lakes are situated above the upper marine limit on the peninsula Tugtuligssuaq in Melville Bugt, in a highly maritime climate.
The vegetation, invading the deglaciated soil around 8500 B.P., was a speciesrich
pioneer vegetation, dominated by Poaceae, Oxyria digyna and other herbs, including
some species not growing on the peninsula today. The first dwarf-shrubs, Empetrum
hermaphroditum and Vaccinium uliginosum, immigrated in the coming centuries,
followed by Cassiope tetragona. By 6700 B.P. Salix arctica and S. herbacea immigrated.
These species together with Cyperaceae, later on Cassiope, dominate the pollen spectra until c. 2300 B.P. The influx of long-distance pollen, indicating more frequent south-westerly winds, increased around 5000 B.P. and remained at a high level until a marked decrease is seen c. 2300 B.P. Since then the influx was very low. Cassiope dominates in the recent PV zone. The lakes were fairly rich in the first millennia
with high production of Pediastrum and Botryococcus. Colymbetes dolabratus and Gasterosteus aculeatus, both north of their present distribution limit, lived in the lakes at an early stage.
Qeqertat at the head of Inglefield Bredning has a more continental climate. The cored lake was not isolated from the sea until 6800 B.P., just prior to the immigration of Salix arctica. Cyperaceae dominate the pollen diagram until around 3500 B.P. when Cassiope and especially Salix arctica become more frequent. At the same time marked changes in the microflora in the lake indicate increased frost boil activity around the lake as a result of a climatic change. Open soil plants are more frequent in the present PV zone.
Pollen influx is low in these high arctic lakes, viz. c. 6 in the recent PV zone in Langesø
and c. 1 in the Qeqertat lake. Melt water washes down pollen and other plant material from the surrounding slopes into Rundesø, thus causing too high influx values.
Alle udgivelser af
Bent Fredskild som forfatter
The vegetation types of Northeast Greenland 1998, ISBN 978-87-635-1247-3, hft
The vegetation types of Northeast Greenland 1998, ISBN 978-87-635-1247-3, hft
A phytogeographical study of the vascular plants of West Greenland (62°20'-74°00'N) 1996, ISBN 978-87-635-1235-0, hft
A phytogeographical study of the vascular plants of West Greenland (62°20'-74°00'N) 1996, ISBN 978-87-635-1235-0, hft
Plant and arthropod remains from the palaeo-Eskimo site on Qeqertasussuk, West Greenland 1993, ISBN 978-87-635-1220-6, hft
Plant and arthropod remains from the palaeo-Eskimo site on Qeqertasussuk, West Greenland 1993, ISBN 978-87-635-1220-6, hft
Bent Fredskild som redaktør
The Greenland Mountain birch zone, Southwest Greenland 1990, ISBN 978-87-635-1204-6, hft
The Greenland Mountain birch zone, Southwest Greenland 1990, ISBN 978-87-635-1204-6, hft
The Holocene vegetational development of the Godthåbsfjord area, West Greenland 1983, ISBN 978-87-635-1153-7, hft
The Holocene vegetational development of the Godthåbsfjord area, West Greenland 1983, ISBN 978-87-635-1153-7, hft
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