Effects of mesoscale phytoplankton variability on the copepods Neocalanus flemingeri and N. plumchrus in the coastal Gulf of Alaska
The copepods Neocalanus flemingeri and N. plumchrus are major components of the mesozooplankton on the shelf of the Gulf of Alaska, where they feed, grow and develop during April-June, the period encompassing the spring phytoplankton bloom. Satellite imagery indicates high mesoscale variability in p...
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ftunivsthongkong:oai:repository.ust.hk:1783.1-20214 |
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openpolar |
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Open Polar |
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The Hong Kong University of Science and Technology: HKUST Institutional Repository |
op_collection_id |
ftunivsthongkong |
language |
English |
topic |
Grazing Gulf of Alaska Mesoscale Neocalanus Phytoplankton |
spellingShingle |
Grazing Gulf of Alaska Mesoscale Neocalanus Phytoplankton Dagg, M.J. Liu, H. Thomas, A.C. Effects of mesoscale phytoplankton variability on the copepods Neocalanus flemingeri and N. plumchrus in the coastal Gulf of Alaska |
topic_facet |
Grazing Gulf of Alaska Mesoscale Neocalanus Phytoplankton |
description |
The copepods Neocalanus flemingeri and N. plumchrus are major components of the mesozooplankton on the shelf of the Gulf of Alaska, where they feed, grow and develop during April-June, the period encompassing the spring phytoplankton bloom. Satellite imagery indicates high mesoscale variability in phytoplankton concentration during this time. Because copepod ingestion is related to food concentration, we hypothesized that phytoplankton ingestion by N. flemingeri and N. plumchrus would vary in response to mesoscale variability of phytoplankton. We proposed that copepods on the inner shelf, where the phytoplankton bloom is most pronounced, would be larger and have more lipid stores than animals collected from the outer shelf, where phytoplankton concentrations are typically low. Shipboard feeding experiments with both copepods were done in spring of 2001 and 2003 using natural water as food medium. Chlorophyll concentration ranged widely, between 0.32 and 11.44 μg l -1 and ingestion rates varied accordingly, between 6.0 and 627.0 ng chl cop -1 d -1 . At chlorophyll concentrations<0.50 μg l -1 , ingestion is always low, <40 ng cop -1 d -1 . Intermediate ingestion rates were observed at chlorophyll concentrations between 0.5 and 1.5 μg l -1 , and maximum rates at chlorophyll concentrations>1.5 μg l -1 . Application of these feeding rates to the phytoplankton distribution on the shelf allowed locations and time periods of low, intermediate and high daily feeding to be calculated for 2001 and 2003. A detailed cross-shelf survey of body size and lipid store in these copepods, however, indicated they were indistinguishable regardless of collection site. Although the daily ingestion of phytoplankton by N. flemingeri and N. plumchrus varied widely because of mesoscale variability in phytoplankton, these daily differences did not result in differences in final body size or lipid storage of these copepods. These copepods efficiently dealt with small and mesoscale variations in their food environment such that mesoscale structure in phytoplankton did not affect their final body size. © 2005 Elsevier Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Dagg, M.J. Liu, H. Thomas, A.C. |
author_facet |
Dagg, M.J. Liu, H. Thomas, A.C. |
author_sort |
Dagg, M.J. |
title |
Effects of mesoscale phytoplankton variability on the copepods Neocalanus flemingeri and N. plumchrus in the coastal Gulf of Alaska |
title_short |
Effects of mesoscale phytoplankton variability on the copepods Neocalanus flemingeri and N. plumchrus in the coastal Gulf of Alaska |
title_full |
Effects of mesoscale phytoplankton variability on the copepods Neocalanus flemingeri and N. plumchrus in the coastal Gulf of Alaska |
title_fullStr |
Effects of mesoscale phytoplankton variability on the copepods Neocalanus flemingeri and N. plumchrus in the coastal Gulf of Alaska |
title_full_unstemmed |
Effects of mesoscale phytoplankton variability on the copepods Neocalanus flemingeri and N. plumchrus in the coastal Gulf of Alaska |
title_sort |
effects of mesoscale phytoplankton variability on the copepods neocalanus flemingeri and n. plumchrus in the coastal gulf of alaska |
publishDate |
2006 |
url |
http://repository.ust.hk/ir/Record/1783.1-20214 https://doi.org/10.1016/j.dsr.2005.09.013 http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0967-0637&rft.volume=53&rft.issue=2&rft.date=2006&rft.spage=321&rft.aulast=Dagg&rft.aufirst=M.J.&rft.atitle=Effects+of+mesoscale+phytoplankton+variability+on+the+copepods+Neocalanus+flemingeri+and+N.+plumchrus+in+the+coastal+Gulf+of+Alaska&rft.title=Deep-Sea+Research+Part+I%3A+Oceanographic+Research+Papers http://www.scopus.com/record/display.url?eid=2-s2.0-31844436244&origin=inward |
geographic |
Gulf of Alaska |
geographic_facet |
Gulf of Alaska |
genre |
Alaska Copepods |
genre_facet |
Alaska Copepods |
op_relation |
http://repository.ust.hk/ir/Record/1783.1-20214 Deep-Sea Research Part I: Oceanographic Research Papers, v. 53, (2), 2006, p. 321-332 0967-0637 https://doi.org/10.1016/j.dsr.2005.09.013 http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0967-0637&rft.volume=53&rft.issue=2&rft.date=2006&rft.spage=321&rft.aulast=Dagg&rft.aufirst=M.J.&rft.atitle=Effects+of+mesoscale+phytoplankton+variability+on+the+copepods+Neocalanus+flemingeri+and+N.+plumchrus+in+the+coastal+Gulf+of+Alaska&rft.title=Deep-Sea+Research+Part+I%3A+Oceanographic+Research+Papers http://www.scopus.com/record/display.url?eid=2-s2.0-31844436244&origin=inward |
op_doi |
https://doi.org/10.1016/j.dsr.2005.09.013 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
53 |
container_issue |
2 |
container_start_page |
321 |
op_container_end_page |
332 |
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1766242053931401216 |
spelling |
ftunivsthongkong:oai:repository.ust.hk:1783.1-20214 2023-05-15T18:48:47+02:00 Effects of mesoscale phytoplankton variability on the copepods Neocalanus flemingeri and N. plumchrus in the coastal Gulf of Alaska Dagg, M.J. Liu, H. Thomas, A.C. 2006 http://repository.ust.hk/ir/Record/1783.1-20214 https://doi.org/10.1016/j.dsr.2005.09.013 http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0967-0637&rft.volume=53&rft.issue=2&rft.date=2006&rft.spage=321&rft.aulast=Dagg&rft.aufirst=M.J.&rft.atitle=Effects+of+mesoscale+phytoplankton+variability+on+the+copepods+Neocalanus+flemingeri+and+N.+plumchrus+in+the+coastal+Gulf+of+Alaska&rft.title=Deep-Sea+Research+Part+I%3A+Oceanographic+Research+Papers http://www.scopus.com/record/display.url?eid=2-s2.0-31844436244&origin=inward English eng http://repository.ust.hk/ir/Record/1783.1-20214 Deep-Sea Research Part I: Oceanographic Research Papers, v. 53, (2), 2006, p. 321-332 0967-0637 https://doi.org/10.1016/j.dsr.2005.09.013 http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0967-0637&rft.volume=53&rft.issue=2&rft.date=2006&rft.spage=321&rft.aulast=Dagg&rft.aufirst=M.J.&rft.atitle=Effects+of+mesoscale+phytoplankton+variability+on+the+copepods+Neocalanus+flemingeri+and+N.+plumchrus+in+the+coastal+Gulf+of+Alaska&rft.title=Deep-Sea+Research+Part+I%3A+Oceanographic+Research+Papers http://www.scopus.com/record/display.url?eid=2-s2.0-31844436244&origin=inward Grazing Gulf of Alaska Mesoscale Neocalanus Phytoplankton Article 2006 ftunivsthongkong https://doi.org/10.1016/j.dsr.2005.09.013 2019-09-03T17:54:51Z The copepods Neocalanus flemingeri and N. plumchrus are major components of the mesozooplankton on the shelf of the Gulf of Alaska, where they feed, grow and develop during April-June, the period encompassing the spring phytoplankton bloom. Satellite imagery indicates high mesoscale variability in phytoplankton concentration during this time. Because copepod ingestion is related to food concentration, we hypothesized that phytoplankton ingestion by N. flemingeri and N. plumchrus would vary in response to mesoscale variability of phytoplankton. We proposed that copepods on the inner shelf, where the phytoplankton bloom is most pronounced, would be larger and have more lipid stores than animals collected from the outer shelf, where phytoplankton concentrations are typically low. Shipboard feeding experiments with both copepods were done in spring of 2001 and 2003 using natural water as food medium. Chlorophyll concentration ranged widely, between 0.32 and 11.44 μg l -1 and ingestion rates varied accordingly, between 6.0 and 627.0 ng chl cop -1 d -1 . At chlorophyll concentrations<0.50 μg l -1 , ingestion is always low, <40 ng cop -1 d -1 . Intermediate ingestion rates were observed at chlorophyll concentrations between 0.5 and 1.5 μg l -1 , and maximum rates at chlorophyll concentrations>1.5 μg l -1 . Application of these feeding rates to the phytoplankton distribution on the shelf allowed locations and time periods of low, intermediate and high daily feeding to be calculated for 2001 and 2003. A detailed cross-shelf survey of body size and lipid store in these copepods, however, indicated they were indistinguishable regardless of collection site. Although the daily ingestion of phytoplankton by N. flemingeri and N. plumchrus varied widely because of mesoscale variability in phytoplankton, these daily differences did not result in differences in final body size or lipid storage of these copepods. These copepods efficiently dealt with small and mesoscale variations in their food environment such that mesoscale structure in phytoplankton did not affect their final body size. © 2005 Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Alaska Copepods The Hong Kong University of Science and Technology: HKUST Institutional Repository Gulf of Alaska Deep Sea Research Part I: Oceanographic Research Papers 53 2 321 332 |