Stratification and dynamics of microbial loop communities in Lake Fryxell, Antarctica
1. Lake Fryxell, situated in the McMurdo Dry Valleys, Antarctica, offers the opportunity to study microbial loop processes in the absence of crustacean zooplankton and other higher organisms. This is the first study of Lake Fryxell to provide detailed temporal and vertical variations of microbial lo...
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ftuhipublicatio:oai:pure.atira.dk:publications/2c53ce26-0323-400b-a45e-8a77f98bacc6 2024-09-15T17:41:04+00:00 Stratification and dynamics of microbial loop communities in Lake Fryxell, Antarctica Roberts, Emily C Laybourn-Parry, J McKnight, D M Novarino, G 2000 https://pure.uhi.ac.uk/en/publications/2c53ce26-0323-400b-a45e-8a77f98bacc6 eng eng https://pure.uhi.ac.uk/en/publications/2c53ce26-0323-400b-a45e-8a77f98bacc6 info:eu-repo/semantics/restrictedAccess Roberts , E C , Laybourn-Parry , J , McKnight , D M & Novarino , G 2000 , ' Stratification and dynamics of microbial loop communities in Lake Fryxell, Antarctica ' , FRESHWATER BIOL , vol. 44 , no. 4 , pp. 649-661 . CRYPTOMONAS BIOMASS ABUNDANCE Marine & Freshwater Biology EASTERN ANTARCTICA ICE-COVERED LAKE MCMURDO DRY VALLEYS PROTOZOOPLANKTON PLANKTON FRESH-WATER LAKES VESTFOLD HILLS article 2000 ftuhipublicatio 2024-06-24T23:48:36Z 1. Lake Fryxell, situated in the McMurdo Dry Valleys, Antarctica, offers the opportunity to study microbial loop processes in the absence of crustacean zooplankton and other higher organisms. This is the first study of Lake Fryxell to provide detailed temporal and vertical variations of microbial loop organisms. 2. Protozoan communities are concentrated around the chemocline (9-10 m) in Lake Fryxell. Phototrophic nanoflagellates (PNAN), heterotrophic nanoflagellates (HNAN) and ciliates formed deep maxima of 14580, 694 and 58 cells mL(-1) respectively. Although abundance and biomass at the chemocline was high, diversity of protozoa was low, Plagiacampa accounting for > 80% of the total ciliate biomass. 3. In the mixolimnion (4.5-8 m), protozoa were less abundant, but more diverse, with 24 ciliate morphotypes being identified within this region of the water column. Interannual variability of protozoan biomass and abundance was greater in the mixolimnion than at the chemocline due to more variable nutrient and prey concentrations. 4. Physicochemical gradients in Lake Fryxell were very stable because the perennial ice cover reduced wind driven currents. As a consequence, ciliate species occurred in distinct depth strata, Monodinium being most abundant directly beneath the ice cover, Askenasia having maximum abundance at 8 m and Plagiocampa dominating ciliate biomass at the chemocline. The lack of vertical mixing reduced seasonal successions of PNAN and ciliate species. Three cryptophyte species dominated the PNAN community at all times (> 79% of total biomass). Article in Journal/Newspaper Antarc* Antarctica McMurdo Dry Valleys University of the Highlands and Islands: Research Database of UHI |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
topic |
CRYPTOMONAS BIOMASS ABUNDANCE Marine & Freshwater Biology EASTERN ANTARCTICA ICE-COVERED LAKE MCMURDO DRY VALLEYS PROTOZOOPLANKTON PLANKTON FRESH-WATER LAKES VESTFOLD HILLS |
spellingShingle |
CRYPTOMONAS BIOMASS ABUNDANCE Marine & Freshwater Biology EASTERN ANTARCTICA ICE-COVERED LAKE MCMURDO DRY VALLEYS PROTOZOOPLANKTON PLANKTON FRESH-WATER LAKES VESTFOLD HILLS Roberts, Emily C Laybourn-Parry, J McKnight, D M Novarino, G Stratification and dynamics of microbial loop communities in Lake Fryxell, Antarctica |
topic_facet |
CRYPTOMONAS BIOMASS ABUNDANCE Marine & Freshwater Biology EASTERN ANTARCTICA ICE-COVERED LAKE MCMURDO DRY VALLEYS PROTOZOOPLANKTON PLANKTON FRESH-WATER LAKES VESTFOLD HILLS |
description |
1. Lake Fryxell, situated in the McMurdo Dry Valleys, Antarctica, offers the opportunity to study microbial loop processes in the absence of crustacean zooplankton and other higher organisms. This is the first study of Lake Fryxell to provide detailed temporal and vertical variations of microbial loop organisms. 2. Protozoan communities are concentrated around the chemocline (9-10 m) in Lake Fryxell. Phototrophic nanoflagellates (PNAN), heterotrophic nanoflagellates (HNAN) and ciliates formed deep maxima of 14580, 694 and 58 cells mL(-1) respectively. Although abundance and biomass at the chemocline was high, diversity of protozoa was low, Plagiacampa accounting for > 80% of the total ciliate biomass. 3. In the mixolimnion (4.5-8 m), protozoa were less abundant, but more diverse, with 24 ciliate morphotypes being identified within this region of the water column. Interannual variability of protozoan biomass and abundance was greater in the mixolimnion than at the chemocline due to more variable nutrient and prey concentrations. 4. Physicochemical gradients in Lake Fryxell were very stable because the perennial ice cover reduced wind driven currents. As a consequence, ciliate species occurred in distinct depth strata, Monodinium being most abundant directly beneath the ice cover, Askenasia having maximum abundance at 8 m and Plagiocampa dominating ciliate biomass at the chemocline. The lack of vertical mixing reduced seasonal successions of PNAN and ciliate species. Three cryptophyte species dominated the PNAN community at all times (> 79% of total biomass). |
format |
Article in Journal/Newspaper |
author |
Roberts, Emily C Laybourn-Parry, J McKnight, D M Novarino, G |
author_facet |
Roberts, Emily C Laybourn-Parry, J McKnight, D M Novarino, G |
author_sort |
Roberts, Emily C |
title |
Stratification and dynamics of microbial loop communities in Lake Fryxell, Antarctica |
title_short |
Stratification and dynamics of microbial loop communities in Lake Fryxell, Antarctica |
title_full |
Stratification and dynamics of microbial loop communities in Lake Fryxell, Antarctica |
title_fullStr |
Stratification and dynamics of microbial loop communities in Lake Fryxell, Antarctica |
title_full_unstemmed |
Stratification and dynamics of microbial loop communities in Lake Fryxell, Antarctica |
title_sort |
stratification and dynamics of microbial loop communities in lake fryxell, antarctica |
publishDate |
2000 |
url |
https://pure.uhi.ac.uk/en/publications/2c53ce26-0323-400b-a45e-8a77f98bacc6 |
genre |
Antarc* Antarctica McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctica McMurdo Dry Valleys |
op_source |
Roberts , E C , Laybourn-Parry , J , McKnight , D M & Novarino , G 2000 , ' Stratification and dynamics of microbial loop communities in Lake Fryxell, Antarctica ' , FRESHWATER BIOL , vol. 44 , no. 4 , pp. 649-661 . |
op_relation |
https://pure.uhi.ac.uk/en/publications/2c53ce26-0323-400b-a45e-8a77f98bacc6 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1810487141468209152 |