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Fredskild, Bent
The Holocene vegetational development of Tugtuligssuaq and Qeqertat, Northwest Greenland

1985, 20 s., hft.
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.

 
Emneområde | Arktiske studier |
Specifikt emneord | Palæobotanik | Pollenanalyser |
Verdensdel m.v. | Grønland |
Sprog | Engelsk |

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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
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
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

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
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
 


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Kunder, som har købt denne titel, købte også

A phytogeographical study of South Greenland     Feilberg, Jon
A phytogeographical study of South Greenland
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The Greenland Mountain birch zone, Southwest Greenland     Fredskild, Bent & Søren Ødum (red.)
The Greenland Mountain birch zone, Southwest Greenland
1990

A phytogeographical study of the vascular plants of northern Greenland - north of 74 northern latitude     Bay, Christian
A phytogeographical study of the vascular plants of northern Greenland - north of 74 northern latitude
1992

Plant and arthropod remains from the palaeo-Eskimo site on Qeqertasussuk, West Greenland     Böcher, Jens & Bent Fredskild
Plant and arthropod remains from the palaeo-Eskimo site on Qeqertasussuk, West Greenland
1993

A phytogeographical study of the vascular plants of West Greenland (62°20'-74°00'N)     Fredskild, Bent
A phytogeographical study of the vascular plants of West Greenland (62°20'-74°00'N)
1996





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