Variability in timing and magnitude of spring bloom in the Oyashio region, the western subarctic Pacific off Hokkaido, Japan
The spring bloom of phytoplankton is a well‐established, regular, seasonal event in the western subarctic Pacific and is considered one of the most important conditions of massive production of pelagic fishes. A series of 12 cruises was conducted from 1990 to 1992 to examine the timing and magnitude...
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crwiley:10.1046/j.1365-2419.1997.00034.x 2024-06-09T07:49:49+00:00 Variability in timing and magnitude of spring bloom in the Oyashio region, the western subarctic Pacific off Hokkaido, Japan KASAI, HIROMI SAITO, HIROAKI YOSHIMORI, AKIRA TAGUCHI, SATORU 1997 http://dx.doi.org/10.1046/j.1365-2419.1997.00034.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-2419.1997.00034.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2419.1997.00034.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Fisheries Oceanography volume 6, issue 2, page 118-129 ISSN 1054-6006 1365-2419 journal-article 1997 crwiley https://doi.org/10.1046/j.1365-2419.1997.00034.x 2024-05-16T14:24:08Z The spring bloom of phytoplankton is a well‐established, regular, seasonal event in the western subarctic Pacific and is considered one of the most important conditions of massive production of pelagic fishes. A series of 12 cruises was conducted from 1990 to 1992 to examine the timing and magnitude of the spring phytoplankton bloom in the Oyashio region, the western subarctic Pacific off Hokkaido, Japan. An interannual variability in the bloom events was also analysed. On the basis of hydrographical characteristics, the study area was divided into three water masses: the Oyashio Water Mass, the Mixed Water Mass, and the Coastal Water Mass. Spring blooms were observed first in April in the Oyashio and the Coastal Water Masses, and continued to May in 1991 and 1992. However, no bloom was recorded in the Mixed Water Mass. High nutrient supply into the surface mixed layer during winter is likely to be one of the factors supporting an intense spring bloom in the Oyashio Water Mass. A significant positive relationship between log‐transformed surface chlorophyll a concentration and maximum density gradient (MDG) within the euphotic layer was obtained in April, indicating the importance of vertical stability of the water column in the initiation of spring blooms in the Oyashio and the Coastal Water Masses. The spring blooms in 1991 were much more extensive and lasted longer than in 1990. It is suggested that meteorological conditions and abundance of grazers were responsible for this interannual difference. Article in Journal/Newspaper Subarctic Wiley Online Library Oyashio ENVELOPE(157.000,157.000,50.000,50.000) Pacific Fisheries Oceanography 6 2 118 129 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
The spring bloom of phytoplankton is a well‐established, regular, seasonal event in the western subarctic Pacific and is considered one of the most important conditions of massive production of pelagic fishes. A series of 12 cruises was conducted from 1990 to 1992 to examine the timing and magnitude of the spring phytoplankton bloom in the Oyashio region, the western subarctic Pacific off Hokkaido, Japan. An interannual variability in the bloom events was also analysed. On the basis of hydrographical characteristics, the study area was divided into three water masses: the Oyashio Water Mass, the Mixed Water Mass, and the Coastal Water Mass. Spring blooms were observed first in April in the Oyashio and the Coastal Water Masses, and continued to May in 1991 and 1992. However, no bloom was recorded in the Mixed Water Mass. High nutrient supply into the surface mixed layer during winter is likely to be one of the factors supporting an intense spring bloom in the Oyashio Water Mass. A significant positive relationship between log‐transformed surface chlorophyll a concentration and maximum density gradient (MDG) within the euphotic layer was obtained in April, indicating the importance of vertical stability of the water column in the initiation of spring blooms in the Oyashio and the Coastal Water Masses. The spring blooms in 1991 were much more extensive and lasted longer than in 1990. It is suggested that meteorological conditions and abundance of grazers were responsible for this interannual difference. |
format |
Article in Journal/Newspaper |
author |
KASAI, HIROMI SAITO, HIROAKI YOSHIMORI, AKIRA TAGUCHI, SATORU |
spellingShingle |
KASAI, HIROMI SAITO, HIROAKI YOSHIMORI, AKIRA TAGUCHI, SATORU Variability in timing and magnitude of spring bloom in the Oyashio region, the western subarctic Pacific off Hokkaido, Japan |
author_facet |
KASAI, HIROMI SAITO, HIROAKI YOSHIMORI, AKIRA TAGUCHI, SATORU |
author_sort |
KASAI, HIROMI |
title |
Variability in timing and magnitude of spring bloom in the Oyashio region, the western subarctic Pacific off Hokkaido, Japan |
title_short |
Variability in timing and magnitude of spring bloom in the Oyashio region, the western subarctic Pacific off Hokkaido, Japan |
title_full |
Variability in timing and magnitude of spring bloom in the Oyashio region, the western subarctic Pacific off Hokkaido, Japan |
title_fullStr |
Variability in timing and magnitude of spring bloom in the Oyashio region, the western subarctic Pacific off Hokkaido, Japan |
title_full_unstemmed |
Variability in timing and magnitude of spring bloom in the Oyashio region, the western subarctic Pacific off Hokkaido, Japan |
title_sort |
variability in timing and magnitude of spring bloom in the oyashio region, the western subarctic pacific off hokkaido, japan |
publisher |
Wiley |
publishDate |
1997 |
url |
http://dx.doi.org/10.1046/j.1365-2419.1997.00034.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-2419.1997.00034.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2419.1997.00034.x |
long_lat |
ENVELOPE(157.000,157.000,50.000,50.000) |
geographic |
Oyashio Pacific |
geographic_facet |
Oyashio Pacific |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Fisheries Oceanography volume 6, issue 2, page 118-129 ISSN 1054-6006 1365-2419 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1365-2419.1997.00034.x |
container_title |
Fisheries Oceanography |
container_volume |
6 |
container_issue |
2 |
container_start_page |
118 |
op_container_end_page |
129 |
_version_ |
1801382691273179136 |