Anomalous conditions in the south‐eastern Bering Sea, 1997: nutrients, phytoplankton and zooplankton
Anomalies in the regional weather over the southeastern Bering Sea during spring and summer of 1997 resulted in significant differences in nutrient availability, phytoplankton species composition, and zooplankton abundance over the continental shelf as compared with measurements in the 1980s. Calm w...
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eScholarship, University of California
2001
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Online Access: | https://escholarship.org/uc/item/1cm4x0dr https://escholarship.org/content/qt1cm4x0dr/qt1cm4x0dr.pdf https://doi.org/10.1046/j.1365-2419.2001.00158.x |
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ftcdlib:oai:escholarship.org:ark:/13030/qt1cm4x0dr 2024-09-09T19:33:40+00:00 Anomalous conditions in the south‐eastern Bering Sea, 1997: nutrients, phytoplankton and zooplankton Stockwell, Dean A Whitledge, Terry E Zeeman, Stephan I Coyle, Kenneth O Napp, Jeffrey M Brodeur, Richard D Pinchuk, Alexei I Hunt, George L 99 - 116 2001-03-01 application/pdf https://escholarship.org/uc/item/1cm4x0dr https://escholarship.org/content/qt1cm4x0dr/qt1cm4x0dr.pdf https://doi.org/10.1046/j.1365-2419.2001.00158.x unknown eScholarship, University of California qt1cm4x0dr https://escholarship.org/uc/item/1cm4x0dr https://escholarship.org/content/qt1cm4x0dr/qt1cm4x0dr.pdf doi:10.1046/j.1365-2419.2001.00158.x CC-BY Fisheries Oceanography, vol 10, iss 1 Bering Sea coccolithophorids Emiliania huxleyi nutrients productivity zooplankton Oceanography Fisheries Sciences Fisheries article 2001 ftcdlib https://doi.org/10.1046/j.1365-2419.2001.00158.x 2024-06-28T06:28:20Z Anomalies in the regional weather over the southeastern Bering Sea during spring and summer of 1997 resulted in significant differences in nutrient availability, phytoplankton species composition, and zooplankton abundance over the continental shelf as compared with measurements in the 1980s. Calm winds and the reduction of cloud cover in spring and summer produced a very shallow mixed layer in which nitrate and silicate were depleted after an April diatom bloom. High submarine light levels allowed subsequent phytoplankton growth below the pycnocline and eventual depletion of nitrate from the water column to depths of 70 m or more. Thus, total new production during 1997 may have exceeded that of previous years when nitrate was not depleted below the pycnocline. A bloom of the coccolithophorid, Emiliania huxleyi, was observed in early July in the warm, nutrient-depleted waters over the middle and inner shelf. Emiliania huxleyi concentrations reached 4.5 × 106 cells L-1 by September, and the bloom persisted through the autumn. There was evidence for increased abundance of some species of copepods in 1997 as compared with data from the middle domain in June 1981. The abundance of adult and juvenile euphausiids in 1997 was statistically similar to values measured in 1980 and 1981. However, near-surface swarms were rarely observed on the inner shelf in August-September 1997. Lack of euphausiid availability in the upper water column may partially explain the August-September mass mortality of planktivorous short-tailed shearwaters (Puffinus tenuirostris) observed on the inner shelf. Article in Journal/Newspaper Bering Sea Puffinus tenuirostris Copepods University of California: eScholarship Bering Sea Fisheries Oceanography 10 1 99 116 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Bering Sea coccolithophorids Emiliania huxleyi nutrients productivity zooplankton Oceanography Fisheries Sciences Fisheries |
spellingShingle |
Bering Sea coccolithophorids Emiliania huxleyi nutrients productivity zooplankton Oceanography Fisheries Sciences Fisheries Stockwell, Dean A Whitledge, Terry E Zeeman, Stephan I Coyle, Kenneth O Napp, Jeffrey M Brodeur, Richard D Pinchuk, Alexei I Hunt, George L Anomalous conditions in the south‐eastern Bering Sea, 1997: nutrients, phytoplankton and zooplankton |
topic_facet |
Bering Sea coccolithophorids Emiliania huxleyi nutrients productivity zooplankton Oceanography Fisheries Sciences Fisheries |
description |
Anomalies in the regional weather over the southeastern Bering Sea during spring and summer of 1997 resulted in significant differences in nutrient availability, phytoplankton species composition, and zooplankton abundance over the continental shelf as compared with measurements in the 1980s. Calm winds and the reduction of cloud cover in spring and summer produced a very shallow mixed layer in which nitrate and silicate were depleted after an April diatom bloom. High submarine light levels allowed subsequent phytoplankton growth below the pycnocline and eventual depletion of nitrate from the water column to depths of 70 m or more. Thus, total new production during 1997 may have exceeded that of previous years when nitrate was not depleted below the pycnocline. A bloom of the coccolithophorid, Emiliania huxleyi, was observed in early July in the warm, nutrient-depleted waters over the middle and inner shelf. Emiliania huxleyi concentrations reached 4.5 × 106 cells L-1 by September, and the bloom persisted through the autumn. There was evidence for increased abundance of some species of copepods in 1997 as compared with data from the middle domain in June 1981. The abundance of adult and juvenile euphausiids in 1997 was statistically similar to values measured in 1980 and 1981. However, near-surface swarms were rarely observed on the inner shelf in August-September 1997. Lack of euphausiid availability in the upper water column may partially explain the August-September mass mortality of planktivorous short-tailed shearwaters (Puffinus tenuirostris) observed on the inner shelf. |
format |
Article in Journal/Newspaper |
author |
Stockwell, Dean A Whitledge, Terry E Zeeman, Stephan I Coyle, Kenneth O Napp, Jeffrey M Brodeur, Richard D Pinchuk, Alexei I Hunt, George L |
author_facet |
Stockwell, Dean A Whitledge, Terry E Zeeman, Stephan I Coyle, Kenneth O Napp, Jeffrey M Brodeur, Richard D Pinchuk, Alexei I Hunt, George L |
author_sort |
Stockwell, Dean A |
title |
Anomalous conditions in the south‐eastern Bering Sea, 1997: nutrients, phytoplankton and zooplankton |
title_short |
Anomalous conditions in the south‐eastern Bering Sea, 1997: nutrients, phytoplankton and zooplankton |
title_full |
Anomalous conditions in the south‐eastern Bering Sea, 1997: nutrients, phytoplankton and zooplankton |
title_fullStr |
Anomalous conditions in the south‐eastern Bering Sea, 1997: nutrients, phytoplankton and zooplankton |
title_full_unstemmed |
Anomalous conditions in the south‐eastern Bering Sea, 1997: nutrients, phytoplankton and zooplankton |
title_sort |
anomalous conditions in the south‐eastern bering sea, 1997: nutrients, phytoplankton and zooplankton |
publisher |
eScholarship, University of California |
publishDate |
2001 |
url |
https://escholarship.org/uc/item/1cm4x0dr https://escholarship.org/content/qt1cm4x0dr/qt1cm4x0dr.pdf https://doi.org/10.1046/j.1365-2419.2001.00158.x |
op_coverage |
99 - 116 |
geographic |
Bering Sea |
geographic_facet |
Bering Sea |
genre |
Bering Sea Puffinus tenuirostris Copepods |
genre_facet |
Bering Sea Puffinus tenuirostris Copepods |
op_source |
Fisheries Oceanography, vol 10, iss 1 |
op_relation |
qt1cm4x0dr https://escholarship.org/uc/item/1cm4x0dr https://escholarship.org/content/qt1cm4x0dr/qt1cm4x0dr.pdf doi:10.1046/j.1365-2419.2001.00158.x |
op_rights |
CC-BY |
op_doi |
https://doi.org/10.1046/j.1365-2419.2001.00158.x |
container_title |
Fisheries Oceanography |
container_volume |
10 |
container_issue |
1 |
container_start_page |
99 |
op_container_end_page |
116 |
_version_ |
1809903210968645632 |