Flagellate nutritional versatility as a key to survival in two contrasting Antarctic saline lakes
1. Seasonal patterns of grazing and photosynthesis were investigated in two salineAntarctic lakes (Highway and Ace) in the Vestfold Hills (68 degrees S). The phototrophicnanoflagellate (PNAN) community was dominated by Pyramimonas gelidicola and twomorphological forms of a cryptophyte species that o...
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ftunivtasecite:oai:ecite.utas.edu.au:49055 2023-05-15T13:40:51+02:00 Flagellate nutritional versatility as a key to survival in two contrasting Antarctic saline lakes Laybourn-Parry, J Marshall, WA Marchant, HJ 2005 application/pdf http://interscience.wiley.com https://doi.org/10.1111/j.1365-2427.2005.01369.x http://ecite.utas.edu.au/49055 en eng Blackwell Publishing Ltd http://ecite.utas.edu.au/49055/1/FWB Flag PDF.pdf http://dx.doi.org/10.1111/j.1365-2427.2005.01369.x Laybourn-Parry, J and Marshall, WA and Marchant, HJ, Flagellate nutritional versatility as a key to survival in two contrasting Antarctic saline lakes, Freshwater Biology, 50, (5) pp. 830-838. ISSN 0046-5070 (2005) [Refereed Article] http://ecite.utas.edu.au/49055 Biological Sciences Microbiology Microbial Ecology Refereed Article PeerReviewed 2005 ftunivtasecite https://doi.org/10.1111/j.1365-2427.2005.01369.x 2019-12-13T21:23:45Z 1. Seasonal patterns of grazing and photosynthesis were investigated in two salineAntarctic lakes (Highway and Ace) in the Vestfold Hills (68 degrees S). The phototrophicnanoflagellate (PNAN) community was dominated by Pyramimonas gelidicola and twomorphological forms of a cryptophyte species that occurred throughout the year. Bothspecies were mixotrophic on bacteria, and in Highway Lake they also exploited dissolvedorganic carbon as determined by the uptake of fluorescently labelled dextrans.2. Clearance rates ranged between 0.02 and 0.21 nL h)1 cell)1 in Ace Lake and 0.0041.05 nL h)1 cell)1 in Highway Lake. On occasion cryptophyte grazing equalled that of theheterotrophic nanoflagellates (HNAN).3. Photosynthetic rates showed similar trends in both lakes, but there were differences inchlorophyll a specific rates and photosynthetic efficiency, probably related to themeromictic characteristic of Ace Lake. Primary production was measurable in winter andpeaked in summer following the maxima of mixotroph grazing.4. The HNAN community of Highway Lake achieved clearance rates of 0.021.80 nL h)1 cell)1 and removing between 50 and 693 ng bacterial carbon L)1 day)1, withhighest impact in winter when HNAN were most abundant. The HNAN also ingestedfluorescently labelled dextrans showing a preference for 4 and 500 kDa molecules.The more diverse HNAN community of Ace Lake had lower clearance rates(0.040.37 nL h)1 cell)1) and exerted a lower grazing pressure on bacterioplankton. InHighway Lake, where the HNAN community was dominated by the choanoflagellateDiaphanoeca grandis, there was a significant correlation between mean cell volume andclearance rate.5. The major feature was that the microbial plankton functioned throughout the year byemploying nutritional versatility. Article in Journal/Newspaper Antarc* Antarctic eCite UTAS (University of Tasmania) Antarctic Vestfold Hills Vestfold Ace Lake ENVELOPE(78.188,78.188,-68.472,-68.472) Highway Lake ENVELOPE(78.223,78.223,-68.463,-68.463) Freshwater Biology 50 5 830 838 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Microbiology Microbial Ecology |
spellingShingle |
Biological Sciences Microbiology Microbial Ecology Laybourn-Parry, J Marshall, WA Marchant, HJ Flagellate nutritional versatility as a key to survival in two contrasting Antarctic saline lakes |
topic_facet |
Biological Sciences Microbiology Microbial Ecology |
description |
1. Seasonal patterns of grazing and photosynthesis were investigated in two salineAntarctic lakes (Highway and Ace) in the Vestfold Hills (68 degrees S). The phototrophicnanoflagellate (PNAN) community was dominated by Pyramimonas gelidicola and twomorphological forms of a cryptophyte species that occurred throughout the year. Bothspecies were mixotrophic on bacteria, and in Highway Lake they also exploited dissolvedorganic carbon as determined by the uptake of fluorescently labelled dextrans.2. Clearance rates ranged between 0.02 and 0.21 nL h)1 cell)1 in Ace Lake and 0.0041.05 nL h)1 cell)1 in Highway Lake. On occasion cryptophyte grazing equalled that of theheterotrophic nanoflagellates (HNAN).3. Photosynthetic rates showed similar trends in both lakes, but there were differences inchlorophyll a specific rates and photosynthetic efficiency, probably related to themeromictic characteristic of Ace Lake. Primary production was measurable in winter andpeaked in summer following the maxima of mixotroph grazing.4. The HNAN community of Highway Lake achieved clearance rates of 0.021.80 nL h)1 cell)1 and removing between 50 and 693 ng bacterial carbon L)1 day)1, withhighest impact in winter when HNAN were most abundant. The HNAN also ingestedfluorescently labelled dextrans showing a preference for 4 and 500 kDa molecules.The more diverse HNAN community of Ace Lake had lower clearance rates(0.040.37 nL h)1 cell)1) and exerted a lower grazing pressure on bacterioplankton. InHighway Lake, where the HNAN community was dominated by the choanoflagellateDiaphanoeca grandis, there was a significant correlation between mean cell volume andclearance rate.5. The major feature was that the microbial plankton functioned throughout the year byemploying nutritional versatility. |
format |
Article in Journal/Newspaper |
author |
Laybourn-Parry, J Marshall, WA Marchant, HJ |
author_facet |
Laybourn-Parry, J Marshall, WA Marchant, HJ |
author_sort |
Laybourn-Parry, J |
title |
Flagellate nutritional versatility as a key to survival in two contrasting Antarctic saline lakes |
title_short |
Flagellate nutritional versatility as a key to survival in two contrasting Antarctic saline lakes |
title_full |
Flagellate nutritional versatility as a key to survival in two contrasting Antarctic saline lakes |
title_fullStr |
Flagellate nutritional versatility as a key to survival in two contrasting Antarctic saline lakes |
title_full_unstemmed |
Flagellate nutritional versatility as a key to survival in two contrasting Antarctic saline lakes |
title_sort |
flagellate nutritional versatility as a key to survival in two contrasting antarctic saline lakes |
publisher |
Blackwell Publishing Ltd |
publishDate |
2005 |
url |
http://interscience.wiley.com https://doi.org/10.1111/j.1365-2427.2005.01369.x http://ecite.utas.edu.au/49055 |
long_lat |
ENVELOPE(78.188,78.188,-68.472,-68.472) ENVELOPE(78.223,78.223,-68.463,-68.463) |
geographic |
Antarctic Vestfold Hills Vestfold Ace Lake Highway Lake |
geographic_facet |
Antarctic Vestfold Hills Vestfold Ace Lake Highway Lake |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://ecite.utas.edu.au/49055/1/FWB Flag PDF.pdf http://dx.doi.org/10.1111/j.1365-2427.2005.01369.x Laybourn-Parry, J and Marshall, WA and Marchant, HJ, Flagellate nutritional versatility as a key to survival in two contrasting Antarctic saline lakes, Freshwater Biology, 50, (5) pp. 830-838. ISSN 0046-5070 (2005) [Refereed Article] http://ecite.utas.edu.au/49055 |
op_doi |
https://doi.org/10.1111/j.1365-2427.2005.01369.x |
container_title |
Freshwater Biology |
container_volume |
50 |
container_issue |
5 |
container_start_page |
830 |
op_container_end_page |
838 |
_version_ |
1766141345567604736 |