The dynamics of heterotrophic nanoflagellates and bacterioplankton in a large ultra-oligotrophic Antarctic lake
The abundance of both heterotrophic nanoflagellates (HNAN) and bacterioplankton in a large (9km2) ultraoligotrophic Antarctic lake (Crooked Lake) were investigated from December 1992 until November 1993. HNAN abundance peaked in spring, summer and autumn, falling to lowest numbers during the winter....
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Oxford University Press
1995
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fthighwire:oai:open-archive.highwire.org:plankt:17/9/1835 2023-05-15T13:37:22+02:00 The dynamics of heterotrophic nanoflagellates and bacterioplankton in a large ultra-oligotrophic Antarctic lake Laybourn-Parry, Johanna Bayliss, Peter Ellis-Evans, J.Cynan 1995-09-01 00:00:00.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/17/9/1835 https://doi.org/10.1093/plankt/17.9.1835 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/17/9/1835 http://dx.doi.org/10.1093/plankt/17.9.1835 Copyright (C) 1995, Oxford University Press ORIGINAL ARTICLES TEXT 1995 fthighwire https://doi.org/10.1093/plankt/17.9.1835 2007-06-25T07:40:13Z The abundance of both heterotrophic nanoflagellates (HNAN) and bacterioplankton in a large (9km2) ultraoligotrophic Antarctic lake (Crooked Lake) were investigated from December 1992 until November 1993. HNAN abundance peaked in spring, summer and autumn, falling to lowest numbers during the winter. Numbers ranged between 0 and 50.9×104 l−1. Bacterioplankton abundance was highest during the late summer and then fell progressively towards winter and autumn (range 1.19–4.46×106 l−1) In contrast to numbers, mean cell volumes (MCV) of the bacteria reached their highest in spring, and consequently highest bacterial biomass occurred at this time. MCV ranged between 0.052 and 0.224μm3. Bacterial production measurements following the incorporation of [3H] thymidine into DNA and [14C] leucine into protein using a doubling-labelling procedure were undertaken in January, June, August, October and November. Rates varied between 2.8 and 52 ng C l1 h1. On occasions, a significant difference in production rates based on the uptake of leucine and thymidine was observed, suggesting unbalanced growth. Highest rates of production coincided with times of high dissolved organic carbon levels in the water column and lowest production with low levels of DOC. HNAN grazing rates were measured by following the uptake of fluorescently labelled bacteria and averaged 4.8 bacterial cells individual1 day1 at 2 and 4°C. Specific growth rates (h1) ranged around 0.00070–0.00077 in both the field and laboratory, giving doubling times of 37.3 and 41.0 days, respectively. These low rates of grazing and growth indicate that there is no adaptation to low temperatures in these freshwater protists. Based on these data, the gross production efficiency is 24%. HNAN removed between 0.1 and 9.7% of bacterial production per day. Text Antarc* Antarctic HighWire Press (Stanford University) Antarctic Crooked Lake ENVELOPE(78.382,78.382,-68.617,-68.617) Journal of Plankton Research 17 9 1835 1850 |
institution |
Open Polar |
collection |
HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
ORIGINAL ARTICLES |
spellingShingle |
ORIGINAL ARTICLES Laybourn-Parry, Johanna Bayliss, Peter Ellis-Evans, J.Cynan The dynamics of heterotrophic nanoflagellates and bacterioplankton in a large ultra-oligotrophic Antarctic lake |
topic_facet |
ORIGINAL ARTICLES |
description |
The abundance of both heterotrophic nanoflagellates (HNAN) and bacterioplankton in a large (9km2) ultraoligotrophic Antarctic lake (Crooked Lake) were investigated from December 1992 until November 1993. HNAN abundance peaked in spring, summer and autumn, falling to lowest numbers during the winter. Numbers ranged between 0 and 50.9×104 l−1. Bacterioplankton abundance was highest during the late summer and then fell progressively towards winter and autumn (range 1.19–4.46×106 l−1) In contrast to numbers, mean cell volumes (MCV) of the bacteria reached their highest in spring, and consequently highest bacterial biomass occurred at this time. MCV ranged between 0.052 and 0.224μm3. Bacterial production measurements following the incorporation of [3H] thymidine into DNA and [14C] leucine into protein using a doubling-labelling procedure were undertaken in January, June, August, October and November. Rates varied between 2.8 and 52 ng C l1 h1. On occasions, a significant difference in production rates based on the uptake of leucine and thymidine was observed, suggesting unbalanced growth. Highest rates of production coincided with times of high dissolved organic carbon levels in the water column and lowest production with low levels of DOC. HNAN grazing rates were measured by following the uptake of fluorescently labelled bacteria and averaged 4.8 bacterial cells individual1 day1 at 2 and 4°C. Specific growth rates (h1) ranged around 0.00070–0.00077 in both the field and laboratory, giving doubling times of 37.3 and 41.0 days, respectively. These low rates of grazing and growth indicate that there is no adaptation to low temperatures in these freshwater protists. Based on these data, the gross production efficiency is 24%. HNAN removed between 0.1 and 9.7% of bacterial production per day. |
format |
Text |
author |
Laybourn-Parry, Johanna Bayliss, Peter Ellis-Evans, J.Cynan |
author_facet |
Laybourn-Parry, Johanna Bayliss, Peter Ellis-Evans, J.Cynan |
author_sort |
Laybourn-Parry, Johanna |
title |
The dynamics of heterotrophic nanoflagellates and bacterioplankton in a large ultra-oligotrophic Antarctic lake |
title_short |
The dynamics of heterotrophic nanoflagellates and bacterioplankton in a large ultra-oligotrophic Antarctic lake |
title_full |
The dynamics of heterotrophic nanoflagellates and bacterioplankton in a large ultra-oligotrophic Antarctic lake |
title_fullStr |
The dynamics of heterotrophic nanoflagellates and bacterioplankton in a large ultra-oligotrophic Antarctic lake |
title_full_unstemmed |
The dynamics of heterotrophic nanoflagellates and bacterioplankton in a large ultra-oligotrophic Antarctic lake |
title_sort |
dynamics of heterotrophic nanoflagellates and bacterioplankton in a large ultra-oligotrophic antarctic lake |
publisher |
Oxford University Press |
publishDate |
1995 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/17/9/1835 https://doi.org/10.1093/plankt/17.9.1835 |
long_lat |
ENVELOPE(78.382,78.382,-68.617,-68.617) |
geographic |
Antarctic Crooked Lake |
geographic_facet |
Antarctic Crooked Lake |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/17/9/1835 http://dx.doi.org/10.1093/plankt/17.9.1835 |
op_rights |
Copyright (C) 1995, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/17.9.1835 |
container_title |
Journal of Plankton Research |
container_volume |
17 |
container_issue |
9 |
container_start_page |
1835 |
op_container_end_page |
1850 |
_version_ |
1766090794477813760 |