Climatic effects on plankton and productivity on the Faroe Shelf
Abstract Previous investigations have shown that new primary production on the Faroe Shelf during the spring bloom varies considerably from one year to another, both with regard to timing and intensity. It has also been found that variations in new primary production are transmitted up the food chai...
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2005
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croxfordunivpr:10.1016/j.icesjms.2005.04.014 2023-09-05T13:18:36+02:00 Climatic effects on plankton and productivity on the Faroe Shelf Hansen, Bogi Eliasen, Sólvá K. Gaard, Eilif Larsen, Karin M.H. 2005 http://dx.doi.org/10.1016/j.icesjms.2005.04.014 http://academic.oup.com/icesjms/article-pdf/62/7/1224/29123963/62-7-1224.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 62, issue 7, page 1224-1232 ISSN 1095-9289 1054-3139 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2005 croxfordunivpr https://doi.org/10.1016/j.icesjms.2005.04.014 2023-08-18T10:02:12Z Abstract Previous investigations have shown that new primary production on the Faroe Shelf during the spring bloom varies considerably from one year to another, both with regard to timing and intensity. It has also been found that variations in new primary production are transmitted up the food chain to top predators such as cod and haddock. An observed inverse relationship between new primary production and zooplankton biomass, especially Calanus finmarchicus, might be due to grazing, but could also reflect a dependence of both new primary production and C. finmarchicus import on the horizontal exchange between waters on the shelf and off it. Here, we investigate this question, using observations and an idealized numerical model. We find that the large variability in new primary production is most likely due to the direct effect of variable horizontal exchange rates on phytoplankton reproduction (horizontal Sverdrup mechanism), rather than grazing. Enhanced horizontal exchange flushes phytoplankton from the shallow areas and limits primary production. Horizontal exchange rate seems most sensitive to horizontal density differences between on-shelf and off-shelf waters, which is governed by atmosphere–ocean heat exchange and precipitation. For the primary observational period from 1990 to 2003, a close relationship was found between air temperature in January–April and new primary production. Cold winters produced large density differences, small horizontal exchange rates, and intensive new primary production. Other, less direct, evidence indicates, however, that this relationship may not have been valid in a period before 1990. Article in Journal/Newspaper Calanus finmarchicus Oxford University Press (via Crossref) Faroe Shelf ENVELOPE(-6.000,-6.000,62.000,62.000) ICES Journal of Marine Science 62 7 1224 1232 |
institution |
Open Polar |
collection |
Oxford University Press (via Crossref) |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography Hansen, Bogi Eliasen, Sólvá K. Gaard, Eilif Larsen, Karin M.H. Climatic effects on plankton and productivity on the Faroe Shelf |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Previous investigations have shown that new primary production on the Faroe Shelf during the spring bloom varies considerably from one year to another, both with regard to timing and intensity. It has also been found that variations in new primary production are transmitted up the food chain to top predators such as cod and haddock. An observed inverse relationship between new primary production and zooplankton biomass, especially Calanus finmarchicus, might be due to grazing, but could also reflect a dependence of both new primary production and C. finmarchicus import on the horizontal exchange between waters on the shelf and off it. Here, we investigate this question, using observations and an idealized numerical model. We find that the large variability in new primary production is most likely due to the direct effect of variable horizontal exchange rates on phytoplankton reproduction (horizontal Sverdrup mechanism), rather than grazing. Enhanced horizontal exchange flushes phytoplankton from the shallow areas and limits primary production. Horizontal exchange rate seems most sensitive to horizontal density differences between on-shelf and off-shelf waters, which is governed by atmosphere–ocean heat exchange and precipitation. For the primary observational period from 1990 to 2003, a close relationship was found between air temperature in January–April and new primary production. Cold winters produced large density differences, small horizontal exchange rates, and intensive new primary production. Other, less direct, evidence indicates, however, that this relationship may not have been valid in a period before 1990. |
format |
Article in Journal/Newspaper |
author |
Hansen, Bogi Eliasen, Sólvá K. Gaard, Eilif Larsen, Karin M.H. |
author_facet |
Hansen, Bogi Eliasen, Sólvá K. Gaard, Eilif Larsen, Karin M.H. |
author_sort |
Hansen, Bogi |
title |
Climatic effects on plankton and productivity on the Faroe Shelf |
title_short |
Climatic effects on plankton and productivity on the Faroe Shelf |
title_full |
Climatic effects on plankton and productivity on the Faroe Shelf |
title_fullStr |
Climatic effects on plankton and productivity on the Faroe Shelf |
title_full_unstemmed |
Climatic effects on plankton and productivity on the Faroe Shelf |
title_sort |
climatic effects on plankton and productivity on the faroe shelf |
publisher |
Oxford University Press (OUP) |
publishDate |
2005 |
url |
http://dx.doi.org/10.1016/j.icesjms.2005.04.014 http://academic.oup.com/icesjms/article-pdf/62/7/1224/29123963/62-7-1224.pdf |
long_lat |
ENVELOPE(-6.000,-6.000,62.000,62.000) |
geographic |
Faroe Shelf |
geographic_facet |
Faroe Shelf |
genre |
Calanus finmarchicus |
genre_facet |
Calanus finmarchicus |
op_source |
ICES Journal of Marine Science volume 62, issue 7, page 1224-1232 ISSN 1095-9289 1054-3139 |
op_doi |
https://doi.org/10.1016/j.icesjms.2005.04.014 |
container_title |
ICES Journal of Marine Science |
container_volume |
62 |
container_issue |
7 |
container_start_page |
1224 |
op_container_end_page |
1232 |
_version_ |
1776199525534269440 |