Dynamics of microplankton communities at the ice-edge zone of the Lazarev Sea during a summer drogue study
Microzooplankton grazing and community structure were investigated in the austral summer of 1995 during a Southern Ocean Drogue and Ocean Flux Study (SODOFS) at the ice-edge zone of the Lazarev Sea. Grazing was estimated at the surface chlorophyll maximum (5–10 m) by employing the sequential dilutio...
Published in: | Journal of Plankton Research |
---|---|
Main Authors: | , , |
Format: | Text |
Language: | English |
Published: |
Oxford University Press
1996
|
Subjects: | |
Online Access: | http://plankt.oxfordjournals.org/cgi/content/short/18/8/1455 https://doi.org/10.1093/plankt/18.8.1455 |
id |
fthighwire:oai:open-archive.highwire.org:plankt:18/8/1455 |
---|---|
record_format |
openpolar |
spelling |
fthighwire:oai:open-archive.highwire.org:plankt:18/8/1455 2023-05-15T17:07:25+02:00 Dynamics of microplankton communities at the ice-edge zone of the Lazarev Sea during a summer drogue study Froneman, P.W. Perissinotto, R. McQuaid, C.D. 1996-08-01 00:00:00.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/18/8/1455 https://doi.org/10.1093/plankt/18.8.1455 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/18/8/1455 http://dx.doi.org/10.1093/plankt/18.8.1455 Copyright (C) 1996, Oxford University Press ORIGINAL ARTICLES TEXT 1996 fthighwire https://doi.org/10.1093/plankt/18.8.1455 2007-06-24T19:25:40Z Microzooplankton grazing and community structure were investigated in the austral summer of 1995 during a Southern Ocean Drogue and Ocean Flux Study (SODOFS) at the ice-edge zone of the Lazarev Sea. Grazing was estimated at the surface chlorophyll maximum (5–10 m) by employing the sequential dilution technique. Chlorophyll a concentrations were dominated by chainforming microphytoplankton (>20 μm) of the genera Chaetoceros and Nitzschia . Microzooplankton were numerically dominated by aloricate ciliates and dinoflagellates ( Protoperidinium sp., Amphisoleta sp. and Gymnodinium sp.). Instantaneous growth rates of nanophytoplankton (<20 μm) varied between 0.019 and 0.080 day−1, equivalent to between 0.03 and 0.12 chlorophyll doublings day−1. Instantaneous grazing rates of microzooplankton on nanophytoplankton varied from 0.012 to 0.052 day−1. This corresponds to a nanophytoplankton daily loss of between 1.3 and 7.0% (mean = 3.76%) of the initial standing stock, and between 45 and 97% (mean = 70.37%) of the daily potential production. Growth rates of microphytoplankton (>20 μm) were lower, varying between 0.011 and 0.070 day−1, equivalent to 0.015–0.097 chlorophyll doublings day−1. At only three of the 10 stations did grazing by microzooplankton result in a decrease in microphytoplankton concentration. At these stations instantaneous grazing rates of microzooplankton on microphytoplankton ranged between 0.009 and 0.015 day−1, equivalent to a daily loss of <1.56% (mean = 1.11%) of initial standing stock and <40% (mean = 28.55%) of the potential production. Time series grazing experiments conducted at 6 h intervals did not show any diel patterns of grazing by microzooplankton. Our data show that microzooplankton grazing at the ice edge were not sufficient to prevent chlorophyll a accumulation in regions dominated by rnicrophytoplankton. Here, the major biological routes for the uptake of carbon therefore appear to be grazing by metazoans or the sedimentation of phytoplankton cells. Under these ... Text Lazarev Sea Southern Ocean HighWire Press (Stanford University) Southern Ocean Austral Lazarev ENVELOPE(12.917,12.917,-69.967,-69.967) Lazarev Sea ENVELOPE(7.000,7.000,-68.000,-68.000) Journal of Plankton Research 18 8 1455 1470 |
institution |
Open Polar |
collection |
HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
ORIGINAL ARTICLES |
spellingShingle |
ORIGINAL ARTICLES Froneman, P.W. Perissinotto, R. McQuaid, C.D. Dynamics of microplankton communities at the ice-edge zone of the Lazarev Sea during a summer drogue study |
topic_facet |
ORIGINAL ARTICLES |
description |
Microzooplankton grazing and community structure were investigated in the austral summer of 1995 during a Southern Ocean Drogue and Ocean Flux Study (SODOFS) at the ice-edge zone of the Lazarev Sea. Grazing was estimated at the surface chlorophyll maximum (5–10 m) by employing the sequential dilution technique. Chlorophyll a concentrations were dominated by chainforming microphytoplankton (>20 μm) of the genera Chaetoceros and Nitzschia . Microzooplankton were numerically dominated by aloricate ciliates and dinoflagellates ( Protoperidinium sp., Amphisoleta sp. and Gymnodinium sp.). Instantaneous growth rates of nanophytoplankton (<20 μm) varied between 0.019 and 0.080 day−1, equivalent to between 0.03 and 0.12 chlorophyll doublings day−1. Instantaneous grazing rates of microzooplankton on nanophytoplankton varied from 0.012 to 0.052 day−1. This corresponds to a nanophytoplankton daily loss of between 1.3 and 7.0% (mean = 3.76%) of the initial standing stock, and between 45 and 97% (mean = 70.37%) of the daily potential production. Growth rates of microphytoplankton (>20 μm) were lower, varying between 0.011 and 0.070 day−1, equivalent to 0.015–0.097 chlorophyll doublings day−1. At only three of the 10 stations did grazing by microzooplankton result in a decrease in microphytoplankton concentration. At these stations instantaneous grazing rates of microzooplankton on microphytoplankton ranged between 0.009 and 0.015 day−1, equivalent to a daily loss of <1.56% (mean = 1.11%) of initial standing stock and <40% (mean = 28.55%) of the potential production. Time series grazing experiments conducted at 6 h intervals did not show any diel patterns of grazing by microzooplankton. Our data show that microzooplankton grazing at the ice edge were not sufficient to prevent chlorophyll a accumulation in regions dominated by rnicrophytoplankton. Here, the major biological routes for the uptake of carbon therefore appear to be grazing by metazoans or the sedimentation of phytoplankton cells. Under these ... |
format |
Text |
author |
Froneman, P.W. Perissinotto, R. McQuaid, C.D. |
author_facet |
Froneman, P.W. Perissinotto, R. McQuaid, C.D. |
author_sort |
Froneman, P.W. |
title |
Dynamics of microplankton communities at the ice-edge zone of the Lazarev Sea during a summer drogue study |
title_short |
Dynamics of microplankton communities at the ice-edge zone of the Lazarev Sea during a summer drogue study |
title_full |
Dynamics of microplankton communities at the ice-edge zone of the Lazarev Sea during a summer drogue study |
title_fullStr |
Dynamics of microplankton communities at the ice-edge zone of the Lazarev Sea during a summer drogue study |
title_full_unstemmed |
Dynamics of microplankton communities at the ice-edge zone of the Lazarev Sea during a summer drogue study |
title_sort |
dynamics of microplankton communities at the ice-edge zone of the lazarev sea during a summer drogue study |
publisher |
Oxford University Press |
publishDate |
1996 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/18/8/1455 https://doi.org/10.1093/plankt/18.8.1455 |
long_lat |
ENVELOPE(12.917,12.917,-69.967,-69.967) ENVELOPE(7.000,7.000,-68.000,-68.000) |
geographic |
Southern Ocean Austral Lazarev Lazarev Sea |
geographic_facet |
Southern Ocean Austral Lazarev Lazarev Sea |
genre |
Lazarev Sea Southern Ocean |
genre_facet |
Lazarev Sea Southern Ocean |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/18/8/1455 http://dx.doi.org/10.1093/plankt/18.8.1455 |
op_rights |
Copyright (C) 1996, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/18.8.1455 |
container_title |
Journal of Plankton Research |
container_volume |
18 |
container_issue |
8 |
container_start_page |
1455 |
op_container_end_page |
1470 |
_version_ |
1766062836035878912 |