Geographic and environmental factors affecting the distribution of kelp beds and barren grounds and changes in biota associated with kelp reduction at sites along the Norwegian coast
Sites at 244 locations along the west and north Norwegian coasts were investigated to evaluate whether kelp (Laminaria hyperborea) beds had been overgrazed by the sea urchins Strongylocentrotus droebachiensis and Echinus esculentus in the years 1981-1992. Barren ground communities were found in shel...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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1997
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Online Access: | http://dx.doi.org/10.1139/f97-186 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-186 |
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crcansciencepubl:10.1139/f97-186 2024-05-19T07:36:26+00:00 Geographic and environmental factors affecting the distribution of kelp beds and barren grounds and changes in biota associated with kelp reduction at sites along the Norwegian coast Sivertsen, Knut 1997 http://dx.doi.org/10.1139/f97-186 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-186 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 54, issue 12, page 2872-2887 ISSN 0706-652X 1205-7533 journal-article 1997 crcansciencepubl https://doi.org/10.1139/f97-186 2024-05-02T06:51:25Z Sites at 244 locations along the west and north Norwegian coasts were investigated to evaluate whether kelp (Laminaria hyperborea) beds had been overgrazed by the sea urchins Strongylocentrotus droebachiensis and Echinus esculentus in the years 1981-1992. Barren ground communities were found in sheltered and moderately wave-exposed areas mainly in the inner and middle archipelago from Nordmøre (63°N) northwards. Densities of large-sized (adult and intermediate) L. hyperborea were 20.7 individuals ·m -2 in kelp beds and 9.7 individuals ·m -2 in transition areas. Juvenile Laminaria spp. were present at densities of 23.9 individuals ·m -2 in kelp beds, 3.6 individuals ·m -2 in transition areas, 0.0 individuals ·m -2 in barren grounds, and 59.1 individuals ·m -2 in kelp-harvested locations. Both the densities and the mean size of S. droebachiensis in barren grounds decreased northwards. The mean densities were 52.2 and 26.1 individuals ·m -2 for the areas south and north of the Arctic Circle, respectively. Multivariate analysis (CANOCO) showed that seven ``environmental'' factors (i.e., kelp depth gradient, distance (latitude), time of sampling, nematode infection in S. droebachiensis, wave exposure, coastal gradient, and substratum) contributed significantly to variability in the distribution of kelp beds and barren grounds. Species in hard-bottom communities in shallow waters could be divided into three distinct BIOTA. Article in Journal/Newspaper Arctic Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 54 12 2872 2887 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
description |
Sites at 244 locations along the west and north Norwegian coasts were investigated to evaluate whether kelp (Laminaria hyperborea) beds had been overgrazed by the sea urchins Strongylocentrotus droebachiensis and Echinus esculentus in the years 1981-1992. Barren ground communities were found in sheltered and moderately wave-exposed areas mainly in the inner and middle archipelago from Nordmøre (63°N) northwards. Densities of large-sized (adult and intermediate) L. hyperborea were 20.7 individuals ·m -2 in kelp beds and 9.7 individuals ·m -2 in transition areas. Juvenile Laminaria spp. were present at densities of 23.9 individuals ·m -2 in kelp beds, 3.6 individuals ·m -2 in transition areas, 0.0 individuals ·m -2 in barren grounds, and 59.1 individuals ·m -2 in kelp-harvested locations. Both the densities and the mean size of S. droebachiensis in barren grounds decreased northwards. The mean densities were 52.2 and 26.1 individuals ·m -2 for the areas south and north of the Arctic Circle, respectively. Multivariate analysis (CANOCO) showed that seven ``environmental'' factors (i.e., kelp depth gradient, distance (latitude), time of sampling, nematode infection in S. droebachiensis, wave exposure, coastal gradient, and substratum) contributed significantly to variability in the distribution of kelp beds and barren grounds. Species in hard-bottom communities in shallow waters could be divided into three distinct BIOTA. |
format |
Article in Journal/Newspaper |
author |
Sivertsen, Knut |
spellingShingle |
Sivertsen, Knut Geographic and environmental factors affecting the distribution of kelp beds and barren grounds and changes in biota associated with kelp reduction at sites along the Norwegian coast |
author_facet |
Sivertsen, Knut |
author_sort |
Sivertsen, Knut |
title |
Geographic and environmental factors affecting the distribution of kelp beds and barren grounds and changes in biota associated with kelp reduction at sites along the Norwegian coast |
title_short |
Geographic and environmental factors affecting the distribution of kelp beds and barren grounds and changes in biota associated with kelp reduction at sites along the Norwegian coast |
title_full |
Geographic and environmental factors affecting the distribution of kelp beds and barren grounds and changes in biota associated with kelp reduction at sites along the Norwegian coast |
title_fullStr |
Geographic and environmental factors affecting the distribution of kelp beds and barren grounds and changes in biota associated with kelp reduction at sites along the Norwegian coast |
title_full_unstemmed |
Geographic and environmental factors affecting the distribution of kelp beds and barren grounds and changes in biota associated with kelp reduction at sites along the Norwegian coast |
title_sort |
geographic and environmental factors affecting the distribution of kelp beds and barren grounds and changes in biota associated with kelp reduction at sites along the norwegian coast |
publisher |
Canadian Science Publishing |
publishDate |
1997 |
url |
http://dx.doi.org/10.1139/f97-186 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-186 |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 54, issue 12, page 2872-2887 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f97-186 |
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Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
54 |
container_issue |
12 |
container_start_page |
2872 |
op_container_end_page |
2887 |
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1799475553783250944 |