Phytoplankton growth rates in the Ross Sea, Antarctica
The Ross Sea is a highly productive region of the Southern Ocean, but phytoplankton growth rates there are poorly constrained. Variability in growth rates was investigated on a January−February 2012 cruise to the Ross Sea using 37 14C isotopic tracer incubations and 11 dilution experiments. We exami...
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ftwilliammarycol:oai:scholarworks.wm.edu:vimsarticles-2486 2023-06-11T04:03:58+02:00 Phytoplankton growth rates in the Ross Sea, Antarctica Mosby, Anna F. Smith, Walker O. 2014-02-23T08:00:00Z application/pdf https://scholarworks.wm.edu/vimsarticles/1487 doi: 10.3354/ame01733 https://scholarworks.wm.edu/context/vimsarticles/article/2486/viewcontent/AME_Mosby_Smith2014.pdf unknown W&M ScholarWorks https://scholarworks.wm.edu/vimsarticles/1487 doi: 10.3354/ame01733 https://scholarworks.wm.edu/context/vimsarticles/article/2486/viewcontent/AME_Mosby_Smith2014.pdf VIMS Articles Growth rate · Ross Sea · Phytoplankton · Dilution method · 14C · Temperature Biological Sciences Peer-Reviewed Articles Oceanography text 2014 ftwilliammarycol https://doi.org/10.3354/ame01733 2023-05-04T17:44:40Z The Ross Sea is a highly productive region of the Southern Ocean, but phytoplankton growth rates there are poorly constrained. Variability in growth rates was investigated on a January−February 2012 cruise to the Ross Sea using 37 14C isotopic tracer incubations and 11 dilution experiments. We examined the effects of extended incubations on measured growth rates in 14C incubations, quantified phytoplankton growth and grazing mortality rates through dilution experiments, and analyzed the effects of irradiance on carbon:chlorophyll ratios in dilution experiments. Growth rates in 14C incubations ranged from 0.03 to 0.85 d−1. We found that chlorophyllbased phytoplankton growth rates in dilution experiments differed from measurements based on cell abundance, and concluded that chlorophyll-based growth rates may be inaccurate due to changing carbon:chlorophyll ratios during incubations. Unbalanced phytoplankton growth among experiments was likely due to acclimation due to different mixed layer depth at stations sampled and incubation at constant irradiance. Growth rates measured in 72 h 14C incubations were not markedly different from those conducted over 24 h, indicating that loss of fixed 14C through grazing and respiration was not a significant source of error. All growth rates measured were significantly below those predicted based on temperature. As rates of grazing are low and physical conditions vary spatially, 14C incubations may be a more appropriate means of measuring growth rates than dilution experiments in the Ross Sea. Text Antarc* Antarctica Ross Sea Southern Ocean W&M ScholarWorks Southern Ocean Ross Sea Aquatic Microbial Ecology 74 2 157 171 |
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W&M ScholarWorks |
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ftwilliammarycol |
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topic |
Growth rate · Ross Sea · Phytoplankton · Dilution method · 14C · Temperature Biological Sciences Peer-Reviewed Articles Oceanography |
spellingShingle |
Growth rate · Ross Sea · Phytoplankton · Dilution method · 14C · Temperature Biological Sciences Peer-Reviewed Articles Oceanography Mosby, Anna F. Smith, Walker O. Phytoplankton growth rates in the Ross Sea, Antarctica |
topic_facet |
Growth rate · Ross Sea · Phytoplankton · Dilution method · 14C · Temperature Biological Sciences Peer-Reviewed Articles Oceanography |
description |
The Ross Sea is a highly productive region of the Southern Ocean, but phytoplankton growth rates there are poorly constrained. Variability in growth rates was investigated on a January−February 2012 cruise to the Ross Sea using 37 14C isotopic tracer incubations and 11 dilution experiments. We examined the effects of extended incubations on measured growth rates in 14C incubations, quantified phytoplankton growth and grazing mortality rates through dilution experiments, and analyzed the effects of irradiance on carbon:chlorophyll ratios in dilution experiments. Growth rates in 14C incubations ranged from 0.03 to 0.85 d−1. We found that chlorophyllbased phytoplankton growth rates in dilution experiments differed from measurements based on cell abundance, and concluded that chlorophyll-based growth rates may be inaccurate due to changing carbon:chlorophyll ratios during incubations. Unbalanced phytoplankton growth among experiments was likely due to acclimation due to different mixed layer depth at stations sampled and incubation at constant irradiance. Growth rates measured in 72 h 14C incubations were not markedly different from those conducted over 24 h, indicating that loss of fixed 14C through grazing and respiration was not a significant source of error. All growth rates measured were significantly below those predicted based on temperature. As rates of grazing are low and physical conditions vary spatially, 14C incubations may be a more appropriate means of measuring growth rates than dilution experiments in the Ross Sea. |
format |
Text |
author |
Mosby, Anna F. Smith, Walker O. |
author_facet |
Mosby, Anna F. Smith, Walker O. |
author_sort |
Mosby, Anna F. |
title |
Phytoplankton growth rates in the Ross Sea, Antarctica |
title_short |
Phytoplankton growth rates in the Ross Sea, Antarctica |
title_full |
Phytoplankton growth rates in the Ross Sea, Antarctica |
title_fullStr |
Phytoplankton growth rates in the Ross Sea, Antarctica |
title_full_unstemmed |
Phytoplankton growth rates in the Ross Sea, Antarctica |
title_sort |
phytoplankton growth rates in the ross sea, antarctica |
publisher |
W&M ScholarWorks |
publishDate |
2014 |
url |
https://scholarworks.wm.edu/vimsarticles/1487 https://scholarworks.wm.edu/context/vimsarticles/article/2486/viewcontent/AME_Mosby_Smith2014.pdf |
geographic |
Southern Ocean Ross Sea |
geographic_facet |
Southern Ocean Ross Sea |
genre |
Antarc* Antarctica Ross Sea Southern Ocean |
genre_facet |
Antarc* Antarctica Ross Sea Southern Ocean |
op_source |
VIMS Articles |
op_relation |
https://scholarworks.wm.edu/vimsarticles/1487 doi: 10.3354/ame01733 https://scholarworks.wm.edu/context/vimsarticles/article/2486/viewcontent/AME_Mosby_Smith2014.pdf |
op_doi |
https://doi.org/10.3354/ame01733 |
container_title |
Aquatic Microbial Ecology |
container_volume |
74 |
container_issue |
2 |
container_start_page |
157 |
op_container_end_page |
171 |
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1768384735134875648 |