Annual cycles of primary production and of zooplankton at Southwest Greenland
Annual hydrographic observations, measurements of primary production, and sampling of zooplankton were undertaken in Southwest Greenland waters in the 1950s and -60s. In the coastal area and at the entrance to Godthåbsfjord winter cooling normally extends to the bottom, resulting in a vertical mixi...
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Danish Polar Center/Museum Tusculanum Press
1979
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ftkbcopenhojs:oai:ojs.tidsskrift.dk:article/142178 2024-01-28T10:05:57+01:00 Annual cycles of primary production and of zooplankton at Southwest Greenland Smidt, Erik L. B. 1979-12-14 application/pdf https://tidsskrift.dk/meddrgroenland_biosci/article/view/142178 eng eng Danish Polar Center/Museum Tusculanum Press https://tidsskrift.dk/meddrgroenland_biosci/article/view/142178/185873 https://tidsskrift.dk/meddrgroenland_biosci/article/view/142178 Meddelelser om Grønland. Bioscience; Vol. 1 (1979): Meddelelser om Grønland. Bioscience; 52 pp. Meddelelser om Grønland. Bioscience; Årg. 1 (1979): Meddelelser om Grønland. Bioscience; 52 pp. 0106-1054 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1979 ftkbcopenhojs 2024-01-03T23:58:33Z Annual hydrographic observations, measurements of primary production, and sampling of zooplankton were undertaken in Southwest Greenland waters in the 1950s and -60s. In the coastal area and at the entrance to Godthåbsfjord winter cooling normally extends to the bottom, resulting in a vertical mixing of the water and an effective replenishment of nutrients at the surface. The subsequent production rate is, therefore, high with an average annual gross production calculated to about 160 g C m-2. In the inner fjord regions the stratification is normally much more stable with persisting warm bottom water, and the production is, therefore, lower here than in the coastal area. The seasonal variation in the relations between daylight, primary production, phosphate, and quantity of zooplankton is, presumably, representative of the coastal waters at SW Greenland. A maximum in primary production in spring is normally followed by another maximum in late summer. The number of animals in the microplankton samples from the upper 30 m (the productive layer) is at its maximum simultaneously with the second maximum of the primary production, while the maximum of the macroplankton biomass (taken by stramin net) extends until late autumn in the coastal and outer fjord regions. A maximum of the macroplankton biomass during winter in the deep water layers in the inner Godthåbsfjord, caused by inflow of warm bottom water, stable stratification and cooled outflowing surface water acting as a barrier to the ascent of the animals, is assumed to be normal to the open, non-threshold, W Greenland fjords. Seasonal vertical migration of the zooplankton is indicated by Hensen net hauls from different depths. There is a concentration of zooplankton in the upper water layers in April-September and a deeper concentration from autumn to spring. Annual cycles of various animal groups are described for holoplankton and meroplankton, separately. Holoplankters are normally dominant, copepods being the most numerous group. Meroplankters, especially ... Article in Journal/Newspaper Godthåbsfjord Greenland Copepods Tidsskrift.dk (The Royal Library, Denmark) Greenland |
institution |
Open Polar |
collection |
Tidsskrift.dk (The Royal Library, Denmark) |
op_collection_id |
ftkbcopenhojs |
language |
English |
description |
Annual hydrographic observations, measurements of primary production, and sampling of zooplankton were undertaken in Southwest Greenland waters in the 1950s and -60s. In the coastal area and at the entrance to Godthåbsfjord winter cooling normally extends to the bottom, resulting in a vertical mixing of the water and an effective replenishment of nutrients at the surface. The subsequent production rate is, therefore, high with an average annual gross production calculated to about 160 g C m-2. In the inner fjord regions the stratification is normally much more stable with persisting warm bottom water, and the production is, therefore, lower here than in the coastal area. The seasonal variation in the relations between daylight, primary production, phosphate, and quantity of zooplankton is, presumably, representative of the coastal waters at SW Greenland. A maximum in primary production in spring is normally followed by another maximum in late summer. The number of animals in the microplankton samples from the upper 30 m (the productive layer) is at its maximum simultaneously with the second maximum of the primary production, while the maximum of the macroplankton biomass (taken by stramin net) extends until late autumn in the coastal and outer fjord regions. A maximum of the macroplankton biomass during winter in the deep water layers in the inner Godthåbsfjord, caused by inflow of warm bottom water, stable stratification and cooled outflowing surface water acting as a barrier to the ascent of the animals, is assumed to be normal to the open, non-threshold, W Greenland fjords. Seasonal vertical migration of the zooplankton is indicated by Hensen net hauls from different depths. There is a concentration of zooplankton in the upper water layers in April-September and a deeper concentration from autumn to spring. Annual cycles of various animal groups are described for holoplankton and meroplankton, separately. Holoplankters are normally dominant, copepods being the most numerous group. Meroplankters, especially ... |
format |
Article in Journal/Newspaper |
author |
Smidt, Erik L. B. |
spellingShingle |
Smidt, Erik L. B. Annual cycles of primary production and of zooplankton at Southwest Greenland |
author_facet |
Smidt, Erik L. B. |
author_sort |
Smidt, Erik L. B. |
title |
Annual cycles of primary production and of zooplankton at Southwest Greenland |
title_short |
Annual cycles of primary production and of zooplankton at Southwest Greenland |
title_full |
Annual cycles of primary production and of zooplankton at Southwest Greenland |
title_fullStr |
Annual cycles of primary production and of zooplankton at Southwest Greenland |
title_full_unstemmed |
Annual cycles of primary production and of zooplankton at Southwest Greenland |
title_sort |
annual cycles of primary production and of zooplankton at southwest greenland |
publisher |
Danish Polar Center/Museum Tusculanum Press |
publishDate |
1979 |
url |
https://tidsskrift.dk/meddrgroenland_biosci/article/view/142178 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Godthåbsfjord Greenland Copepods |
genre_facet |
Godthåbsfjord Greenland Copepods |
op_source |
Meddelelser om Grønland. Bioscience; Vol. 1 (1979): Meddelelser om Grønland. Bioscience; 52 pp. Meddelelser om Grønland. Bioscience; Årg. 1 (1979): Meddelelser om Grønland. Bioscience; 52 pp. 0106-1054 |
op_relation |
https://tidsskrift.dk/meddrgroenland_biosci/article/view/142178/185873 https://tidsskrift.dk/meddrgroenland_biosci/article/view/142178 |
_version_ |
1789332520860385280 |