Copepod herbivory rate in a large arctic polynya and its relationship to seasonal and spatial variation in copepod and phytoplankton biomass
Large copepod species (Calanus spp.) overwinter in the North Water Polynya (NOW; ∼75 to 79°N, ∼68 to 78°W) and, via upward migration, can potentially exert a rapid and important grazing impact on the spring phytoplankton bloom. This study investigated the pattern and factors controlling copepod herb...
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ftmemorialuniv:oai:research.library.mun.ca:536 2023-10-01T03:52:39+02:00 Copepod herbivory rate in a large arctic polynya and its relationship to seasonal and spatial variation in copepod and phytoplankton biomass Saunders, D.A. Deibel, D. Stevens, C.J. Rivkin, Richard B. Lee, S.H. Klein, B. 2003-10-17 application/pdf https://research.library.mun.ca/536/ https://research.library.mun.ca/536/1/copepod_herbivory.pdf https://research.library.mun.ca/536/3/copepod_herbivory.pdf http://www.int-res.com/abstracts/meps/v261/p183-199/ en eng Inter-Research https://research.library.mun.ca/536/1/copepod_herbivory.pdf https://research.library.mun.ca/536/3/copepod_herbivory.pdf Saunders, D.A. <https://research.library.mun.ca/view/creator_az/Saunders=3AD=2EA=2E=3A=3A.html> and Deibel, D. <https://research.library.mun.ca/view/creator_az/Deibel=3AD=2E_=3A=3A.html> and Stevens, C.J. <https://research.library.mun.ca/view/creator_az/Stevens=3AC=2EJ=2E=3A=3A.html> and Rivkin, Richard B. <https://research.library.mun.ca/view/creator_az/Rivkin=3ARichard_B=2E_=3A=3A.html> and Lee, S.H. <https://research.library.mun.ca/view/creator_az/Lee=3AS=2EH=2E=3A=3A.html> and Klein, B. <https://research.library.mun.ca/view/creator_az/Klein=3AB=2E=3A=3A.html> (2003) Copepod herbivory rate in a large arctic polynya and its relationship to seasonal and spatial variation in copepod and phytoplankton biomass. Marine Ecology Progress Series, 261. pp. 183-199. ISSN 1616-1599 cc_by_nc QH301 Biology Article PeerReviewed 2003 ftmemorialuniv 2023-09-03T06:43:56Z Large copepod species (Calanus spp.) overwinter in the North Water Polynya (NOW; ∼75 to 79°N, ∼68 to 78°W) and, via upward migration, can potentially exert a rapid and important grazing impact on the spring phytoplankton bloom. This study investigated the pattern and factors controlling copepod herbivory in the NOW from April through July 1998. Typically, there was a chlorophyll maximum between 50 m and the surface. We used incubation experiments to measure weight-specific herbivory rates (0 to 0.24 μg C μg C -1 d -1) representing the average for surface-layer copepod assemblages at each station, and we quantified 0 to 50 m in situ copepod biomass (20 to 3200 mg C m -2). Weight-specific herbivory rate was positively related to initial chlorophyll a concentration in experiments (r 2 = 0.54). Maximum in situ copepod herbivory rate and in situ copepod biomass were larger and peaked earlier at stations dominated by Baffin Bay water in the southern and eastern NOW versus stations dominated by silica-rich arctic water in the northern and western NOW. We used a standard scaling model (I = aW b), where I = maximum daily ingestion rate and W = individual weight, to test the potential effect of size bias on our estimates of total in situ copepod herbivory, because the size structures of experimental and in situ copepod assemblages were often statistically different. Although these calculations found up to ±40% difference in our estimate of total in situ copepod herbivory, this had very little effect on the estimates of copepod impact on daily primary production (±1% PP), because copepod biomass was usually low relative to NOW phytoplankton biomass and productivity. During pre-bloom and spring-bloom conditions, total in situ copepod herbivory was low (<10% of PP). After the spring diatom bloom, we measured higher removal rates (∼15 and 55% of PP) at 2 southern stations, where copepod biomass was high and PP was relatively low. Article in Journal/Newspaper Arctic Arctic Baffin Bay Baffin Bay Baffin Phytoplankton Memorial University of Newfoundland: Research Repository Arctic Baffin Bay |
institution |
Open Polar |
collection |
Memorial University of Newfoundland: Research Repository |
op_collection_id |
ftmemorialuniv |
language |
English |
topic |
QH301 Biology |
spellingShingle |
QH301 Biology Saunders, D.A. Deibel, D. Stevens, C.J. Rivkin, Richard B. Lee, S.H. Klein, B. Copepod herbivory rate in a large arctic polynya and its relationship to seasonal and spatial variation in copepod and phytoplankton biomass |
topic_facet |
QH301 Biology |
description |
Large copepod species (Calanus spp.) overwinter in the North Water Polynya (NOW; ∼75 to 79°N, ∼68 to 78°W) and, via upward migration, can potentially exert a rapid and important grazing impact on the spring phytoplankton bloom. This study investigated the pattern and factors controlling copepod herbivory in the NOW from April through July 1998. Typically, there was a chlorophyll maximum between 50 m and the surface. We used incubation experiments to measure weight-specific herbivory rates (0 to 0.24 μg C μg C -1 d -1) representing the average for surface-layer copepod assemblages at each station, and we quantified 0 to 50 m in situ copepod biomass (20 to 3200 mg C m -2). Weight-specific herbivory rate was positively related to initial chlorophyll a concentration in experiments (r 2 = 0.54). Maximum in situ copepod herbivory rate and in situ copepod biomass were larger and peaked earlier at stations dominated by Baffin Bay water in the southern and eastern NOW versus stations dominated by silica-rich arctic water in the northern and western NOW. We used a standard scaling model (I = aW b), where I = maximum daily ingestion rate and W = individual weight, to test the potential effect of size bias on our estimates of total in situ copepod herbivory, because the size structures of experimental and in situ copepod assemblages were often statistically different. Although these calculations found up to ±40% difference in our estimate of total in situ copepod herbivory, this had very little effect on the estimates of copepod impact on daily primary production (±1% PP), because copepod biomass was usually low relative to NOW phytoplankton biomass and productivity. During pre-bloom and spring-bloom conditions, total in situ copepod herbivory was low (<10% of PP). After the spring diatom bloom, we measured higher removal rates (∼15 and 55% of PP) at 2 southern stations, where copepod biomass was high and PP was relatively low. |
format |
Article in Journal/Newspaper |
author |
Saunders, D.A. Deibel, D. Stevens, C.J. Rivkin, Richard B. Lee, S.H. Klein, B. |
author_facet |
Saunders, D.A. Deibel, D. Stevens, C.J. Rivkin, Richard B. Lee, S.H. Klein, B. |
author_sort |
Saunders, D.A. |
title |
Copepod herbivory rate in a large arctic polynya and its relationship to seasonal and spatial variation in copepod and phytoplankton biomass |
title_short |
Copepod herbivory rate in a large arctic polynya and its relationship to seasonal and spatial variation in copepod and phytoplankton biomass |
title_full |
Copepod herbivory rate in a large arctic polynya and its relationship to seasonal and spatial variation in copepod and phytoplankton biomass |
title_fullStr |
Copepod herbivory rate in a large arctic polynya and its relationship to seasonal and spatial variation in copepod and phytoplankton biomass |
title_full_unstemmed |
Copepod herbivory rate in a large arctic polynya and its relationship to seasonal and spatial variation in copepod and phytoplankton biomass |
title_sort |
copepod herbivory rate in a large arctic polynya and its relationship to seasonal and spatial variation in copepod and phytoplankton biomass |
publisher |
Inter-Research |
publishDate |
2003 |
url |
https://research.library.mun.ca/536/ https://research.library.mun.ca/536/1/copepod_herbivory.pdf https://research.library.mun.ca/536/3/copepod_herbivory.pdf http://www.int-res.com/abstracts/meps/v261/p183-199/ |
geographic |
Arctic Baffin Bay |
geographic_facet |
Arctic Baffin Bay |
genre |
Arctic Arctic Baffin Bay Baffin Bay Baffin Phytoplankton |
genre_facet |
Arctic Arctic Baffin Bay Baffin Bay Baffin Phytoplankton |
op_relation |
https://research.library.mun.ca/536/1/copepod_herbivory.pdf https://research.library.mun.ca/536/3/copepod_herbivory.pdf Saunders, D.A. <https://research.library.mun.ca/view/creator_az/Saunders=3AD=2EA=2E=3A=3A.html> and Deibel, D. <https://research.library.mun.ca/view/creator_az/Deibel=3AD=2E_=3A=3A.html> and Stevens, C.J. <https://research.library.mun.ca/view/creator_az/Stevens=3AC=2EJ=2E=3A=3A.html> and Rivkin, Richard B. <https://research.library.mun.ca/view/creator_az/Rivkin=3ARichard_B=2E_=3A=3A.html> and Lee, S.H. <https://research.library.mun.ca/view/creator_az/Lee=3AS=2EH=2E=3A=3A.html> and Klein, B. <https://research.library.mun.ca/view/creator_az/Klein=3AB=2E=3A=3A.html> (2003) Copepod herbivory rate in a large arctic polynya and its relationship to seasonal and spatial variation in copepod and phytoplankton biomass. Marine Ecology Progress Series, 261. pp. 183-199. ISSN 1616-1599 |
op_rights |
cc_by_nc |
_version_ |
1778518796839944192 |