Copepod summer grazing and fecal pellet production along theWestern Antarctic Peninsula
Copepods are important grazers on phytoplankton and contributors to carbon export, but their role is poorly understood in theWestern Antarctic Peninsula (WAP), a region of high productivity and rapid climate warming. We conducted grazing and egestion experiments with large, dominant copepods each Ja...
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ftwilliammarycol:oai:scholarworks.wm.edu:vimsarticles-1804 2023-06-11T04:06:17+02:00 Copepod summer grazing and fecal pellet production along theWestern Antarctic Peninsula Gleiber, MR Steinberg, Deborah K. Schofield, OME 2016-01-01T08:00:00Z application/pdf https://scholarworks.wm.edu/vimsarticles/804 doi: 10.1093/plankt/fbv070 https://scholarworks.wm.edu/context/vimsarticles/article/1804/viewcontent/Gleiber_2015_Copepod_summer_grazing_and_fecal_pe.pdf unknown W&M ScholarWorks https://scholarworks.wm.edu/vimsarticles/804 doi: 10.1093/plankt/fbv070 https://scholarworks.wm.edu/context/vimsarticles/article/1804/viewcontent/Gleiber_2015_Copepod_summer_grazing_and_fecal_pe.pdf VIMS Articles Rhincalanus-Gigas Copepoda Particulate Organic-Carbon Northern Barents Sea Polar Frontal Zone Marginal Ice-Zone Southern-Ocean Vertical Flux Calanoides-Acutus Atlantic Sector Austral Summer Biological Sciences Peer-Reviewed Articles Aquaculture and Fisheries text 2016 ftwilliammarycol https://doi.org/10.1093/plankt/fbv070 2023-05-04T17:43:31Z Copepods are important grazers on phytoplankton and contributors to carbon export, but their role is poorly understood in theWestern Antarctic Peninsula (WAP), a region of high productivity and rapid climate warming. We conducted grazing and egestion experiments with large, dominant copepods each January from 2012 to 2014. We found higher gut evacuation rates (k), initial gut pigment and ingestion rates (I) for Calanus propinquus and Rhincalanus gigas compared with Calanoides acutus. Since k and I linearly increased with chlorophyll a for most species, ingestion rates were 4-70 times greater in more productive coastal regions than offshore, slope waters. Copepods have a low grazing impact on phytoplankton biomass (< 1%) and productivity (1%, up to 11%) compared with the dominant WAP macro-and microzooplankton. Egestion rates were high (0.8-37.3 mu gC ind.(-1) day(-1)); however, similar to 58% of fecal pellets are retained in the upper water column. Daily carbon rations of similar to 1% indicated feeding on other carbon sources (protozoans and metazoans) to meet metabolic demands. However, during a coastal phytoplankton bloom, daily C rations increased to up to 13%, indicating increased reliance on phytoplankton. Future changes in theWAP plankton community may affect food web carbon flow and export. Text Antarc* Antarctic Antarctic Peninsula Barents Sea Southern Ocean Copepods W&M ScholarWorks Antarctic Southern Ocean Barents Sea Antarctic Peninsula Austral Journal of Plankton Research 38 3 732 750 |
institution |
Open Polar |
collection |
W&M ScholarWorks |
op_collection_id |
ftwilliammarycol |
language |
unknown |
topic |
Rhincalanus-Gigas Copepoda Particulate Organic-Carbon Northern Barents Sea Polar Frontal Zone Marginal Ice-Zone Southern-Ocean Vertical Flux Calanoides-Acutus Atlantic Sector Austral Summer Biological Sciences Peer-Reviewed Articles Aquaculture and Fisheries |
spellingShingle |
Rhincalanus-Gigas Copepoda Particulate Organic-Carbon Northern Barents Sea Polar Frontal Zone Marginal Ice-Zone Southern-Ocean Vertical Flux Calanoides-Acutus Atlantic Sector Austral Summer Biological Sciences Peer-Reviewed Articles Aquaculture and Fisheries Gleiber, MR Steinberg, Deborah K. Schofield, OME Copepod summer grazing and fecal pellet production along theWestern Antarctic Peninsula |
topic_facet |
Rhincalanus-Gigas Copepoda Particulate Organic-Carbon Northern Barents Sea Polar Frontal Zone Marginal Ice-Zone Southern-Ocean Vertical Flux Calanoides-Acutus Atlantic Sector Austral Summer Biological Sciences Peer-Reviewed Articles Aquaculture and Fisheries |
description |
Copepods are important grazers on phytoplankton and contributors to carbon export, but their role is poorly understood in theWestern Antarctic Peninsula (WAP), a region of high productivity and rapid climate warming. We conducted grazing and egestion experiments with large, dominant copepods each January from 2012 to 2014. We found higher gut evacuation rates (k), initial gut pigment and ingestion rates (I) for Calanus propinquus and Rhincalanus gigas compared with Calanoides acutus. Since k and I linearly increased with chlorophyll a for most species, ingestion rates were 4-70 times greater in more productive coastal regions than offshore, slope waters. Copepods have a low grazing impact on phytoplankton biomass (< 1%) and productivity (1%, up to 11%) compared with the dominant WAP macro-and microzooplankton. Egestion rates were high (0.8-37.3 mu gC ind.(-1) day(-1)); however, similar to 58% of fecal pellets are retained in the upper water column. Daily carbon rations of similar to 1% indicated feeding on other carbon sources (protozoans and metazoans) to meet metabolic demands. However, during a coastal phytoplankton bloom, daily C rations increased to up to 13%, indicating increased reliance on phytoplankton. Future changes in theWAP plankton community may affect food web carbon flow and export. |
format |
Text |
author |
Gleiber, MR Steinberg, Deborah K. Schofield, OME |
author_facet |
Gleiber, MR Steinberg, Deborah K. Schofield, OME |
author_sort |
Gleiber, MR |
title |
Copepod summer grazing and fecal pellet production along theWestern Antarctic Peninsula |
title_short |
Copepod summer grazing and fecal pellet production along theWestern Antarctic Peninsula |
title_full |
Copepod summer grazing and fecal pellet production along theWestern Antarctic Peninsula |
title_fullStr |
Copepod summer grazing and fecal pellet production along theWestern Antarctic Peninsula |
title_full_unstemmed |
Copepod summer grazing and fecal pellet production along theWestern Antarctic Peninsula |
title_sort |
copepod summer grazing and fecal pellet production along thewestern antarctic peninsula |
publisher |
W&M ScholarWorks |
publishDate |
2016 |
url |
https://scholarworks.wm.edu/vimsarticles/804 https://scholarworks.wm.edu/context/vimsarticles/article/1804/viewcontent/Gleiber_2015_Copepod_summer_grazing_and_fecal_pe.pdf |
geographic |
Antarctic Southern Ocean Barents Sea Antarctic Peninsula Austral |
geographic_facet |
Antarctic Southern Ocean Barents Sea Antarctic Peninsula Austral |
genre |
Antarc* Antarctic Antarctic Peninsula Barents Sea Southern Ocean Copepods |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Barents Sea Southern Ocean Copepods |
op_source |
VIMS Articles |
op_relation |
https://scholarworks.wm.edu/vimsarticles/804 doi: 10.1093/plankt/fbv070 https://scholarworks.wm.edu/context/vimsarticles/article/1804/viewcontent/Gleiber_2015_Copepod_summer_grazing_and_fecal_pe.pdf |
op_doi |
https://doi.org/10.1093/plankt/fbv070 |
container_title |
Journal of Plankton Research |
container_volume |
38 |
container_issue |
3 |
container_start_page |
732 |
op_container_end_page |
750 |
_version_ |
1768378159377416192 |