The seasonal development of the bacterioplankton bloom
Abstract We report on investigations of bacterioplankton growth dynamics and carbon utilization in the full water column of the Ross Sea, Antarctica carried out on six cruises in 1994-1997, using epifluorescence microscopy, thymidine and leucine incorporation to estimate bacterial abundance and prod...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1062.5721 2023-05-15T13:54:55+02:00 The seasonal development of the bacterioplankton bloom Hugh Ducklow Craig Carlson Matthew Church David Kirchman David Smith Grieg Steward The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1062.5721 http://www.soest.hawaii.edu/oceanography/faculty/steward/StewardLab/Publications_files/DucklowEtAL2001DSRII_b.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1062.5721 http://www.soest.hawaii.edu/oceanography/faculty/steward/StewardLab/Publications_files/DucklowEtAL2001DSRII_b.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.soest.hawaii.edu/oceanography/faculty/steward/StewardLab/Publications_files/DucklowEtAL2001DSRII_b.pdf text ftciteseerx 2020-04-19T00:22:21Z Abstract We report on investigations of bacterioplankton growth dynamics and carbon utilization in the full water column of the Ross Sea, Antarctica carried out on six cruises in 1994-1997, using epifluorescence microscopy, thymidine and leucine incorporation to estimate bacterial abundance and production, respectively. The Ross Sea experienced a bacterial bloom with an amplitude equaling similar blooms observed in the North Atlantic and North Pacific, reaching 3 Â 10 9 cells l À1 or 35 mmol C m À2 in late January. Increases in bacterial biomass were driven both by increases in abundance and in cell volume. Cell volumes ranged from 0.03 mm 3 cell À1 in early spring to over 0.15 mm 3 cell À1 in midsummer. Larger cells were associated with faster division rates. Bacterial growth rates ranged 0.02-0.3 divisions d À1 , equal to rates at lower latitudes. Bacterial biomass accumulated steadily in the upper water column at a net rate of 0.03 d À1 . While there is clear evidence of a bacterial bloom in the Ross Sea, equal to bacterioplankton blooms observed in other oceanic systems, the magnitude of bacterial response relative to the phytoplankton bloom was modest. For example, euphotic zone bacterial production (BP) rates were equivalent to 1-10% of particulate primary production (PP) except in April 1997 when PP was very low and BP : PP was sometimes >1. BP integrated over the upper 300 m was a more substantial fraction of the overlying PP than BP in the euphotic zone alone, with bacterial carbon demand in the upper 300 m about 30% of the seasonal PP. There was significant seasonal variation of bacterial biomass below the euphotic zone, indicating dynamic bacterial growth in the lower layer, and a supply of labile organic matter for bacteria. Bacterial metabolism is apparently limited by DOC flux in the upper layer. There is little evidence of temperature limitation, independent of substrate concentration. The relatively small diagenesis of phytoplankton biomass in the *Corresponding author. Fax:+1-804-684-7293. ... Text Antarc* Antarctica North Atlantic Ross Sea Unknown Pacific Ross Sea |
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ftciteseerx |
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English |
description |
Abstract We report on investigations of bacterioplankton growth dynamics and carbon utilization in the full water column of the Ross Sea, Antarctica carried out on six cruises in 1994-1997, using epifluorescence microscopy, thymidine and leucine incorporation to estimate bacterial abundance and production, respectively. The Ross Sea experienced a bacterial bloom with an amplitude equaling similar blooms observed in the North Atlantic and North Pacific, reaching 3 Â 10 9 cells l À1 or 35 mmol C m À2 in late January. Increases in bacterial biomass were driven both by increases in abundance and in cell volume. Cell volumes ranged from 0.03 mm 3 cell À1 in early spring to over 0.15 mm 3 cell À1 in midsummer. Larger cells were associated with faster division rates. Bacterial growth rates ranged 0.02-0.3 divisions d À1 , equal to rates at lower latitudes. Bacterial biomass accumulated steadily in the upper water column at a net rate of 0.03 d À1 . While there is clear evidence of a bacterial bloom in the Ross Sea, equal to bacterioplankton blooms observed in other oceanic systems, the magnitude of bacterial response relative to the phytoplankton bloom was modest. For example, euphotic zone bacterial production (BP) rates were equivalent to 1-10% of particulate primary production (PP) except in April 1997 when PP was very low and BP : PP was sometimes >1. BP integrated over the upper 300 m was a more substantial fraction of the overlying PP than BP in the euphotic zone alone, with bacterial carbon demand in the upper 300 m about 30% of the seasonal PP. There was significant seasonal variation of bacterial biomass below the euphotic zone, indicating dynamic bacterial growth in the lower layer, and a supply of labile organic matter for bacteria. Bacterial metabolism is apparently limited by DOC flux in the upper layer. There is little evidence of temperature limitation, independent of substrate concentration. The relatively small diagenesis of phytoplankton biomass in the *Corresponding author. Fax:+1-804-684-7293. ... |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Hugh Ducklow Craig Carlson Matthew Church David Kirchman David Smith Grieg Steward |
spellingShingle |
Hugh Ducklow Craig Carlson Matthew Church David Kirchman David Smith Grieg Steward The seasonal development of the bacterioplankton bloom |
author_facet |
Hugh Ducklow Craig Carlson Matthew Church David Kirchman David Smith Grieg Steward |
author_sort |
Hugh Ducklow |
title |
The seasonal development of the bacterioplankton bloom |
title_short |
The seasonal development of the bacterioplankton bloom |
title_full |
The seasonal development of the bacterioplankton bloom |
title_fullStr |
The seasonal development of the bacterioplankton bloom |
title_full_unstemmed |
The seasonal development of the bacterioplankton bloom |
title_sort |
seasonal development of the bacterioplankton bloom |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1062.5721 http://www.soest.hawaii.edu/oceanography/faculty/steward/StewardLab/Publications_files/DucklowEtAL2001DSRII_b.pdf |
geographic |
Pacific Ross Sea |
geographic_facet |
Pacific Ross Sea |
genre |
Antarc* Antarctica North Atlantic Ross Sea |
genre_facet |
Antarc* Antarctica North Atlantic Ross Sea |
op_source |
http://www.soest.hawaii.edu/oceanography/faculty/steward/StewardLab/Publications_files/DucklowEtAL2001DSRII_b.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1062.5721 http://www.soest.hawaii.edu/oceanography/faculty/steward/StewardLab/Publications_files/DucklowEtAL2001DSRII_b.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766261119050055680 |