Temporal dynamics and growth of Actinophrys sol (Sarcodina:Heliozoa), the top predator in an extremely acidic lake
1. The in situ abundance, biomass and mean cell volume of Actinophrys sol (Sarcodina: Heliozoa), the top predator in an extremely acidic German mining lake (Lake 111; pH 2.65), were determined over three consecutive years (spring to autumn, 2001-03). 2. Actinophrys sol exhibited pronounced temporal...
Published in: | Freshwater Biology |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2006
|
Subjects: | |
Online Access: | https://pure.uhi.ac.uk/en/publications/44df38a8-3168-4f5c-bdfb-59c26d24d0e0 https://doi.org/10.1111/j.1365-2427.2006.01561.x |
id |
ftuhipublicatio:oai:pure.atira.dk:publications/44df38a8-3168-4f5c-bdfb-59c26d24d0e0 |
---|---|
record_format |
openpolar |
spelling |
ftuhipublicatio:oai:pure.atira.dk:publications/44df38a8-3168-4f5c-bdfb-59c26d24d0e0 2024-06-23T07:47:45+00:00 Temporal dynamics and growth of Actinophrys sol (Sarcodina:Heliozoa), the top predator in an extremely acidic lake Bell, Elanor M Weithoff, G Gaedke, U 2006 https://pure.uhi.ac.uk/en/publications/44df38a8-3168-4f5c-bdfb-59c26d24d0e0 https://doi.org/10.1111/j.1365-2427.2006.01561.x eng eng https://pure.uhi.ac.uk/en/publications/44df38a8-3168-4f5c-bdfb-59c26d24d0e0 info:eu-repo/semantics/restrictedAccess Bell , E M , Weithoff , G & Gaedke , U 2006 , ' Temporal dynamics and growth of Actinophrys sol (Sarcodina : Heliozoa), the top predator in an extremely acidic lake ' , FRESHWATER BIOL , vol. 51 , no. 6 , pp. 1149-1161 . https://doi.org/10.1111/j.1365-2427.2006.01561.x SEASONAL DYNAMICS MIXOTROPHIC CHRYSOPHYTE MINING LAKES FOOD CAPTURE PLANKTON DYNAMICS MARITIME ANTARCTIC LAKE Marine & Freshwater Biology BACTERIA LIGHT-MICROSCOPY POTERIOOCHROMONAS-MALHAMENSIS PINACIOPHORA article 2006 ftuhipublicatio https://doi.org/10.1111/j.1365-2427.2006.01561.x 2024-05-27T23:51:24Z 1. The in situ abundance, biomass and mean cell volume of Actinophrys sol (Sarcodina: Heliozoa), the top predator in an extremely acidic German mining lake (Lake 111; pH 2.65), were determined over three consecutive years (spring to autumn, 2001-03). 2. Actinophrys sol exhibited pronounced temporal and vertical patterns in abundance, biomass and mean cell volume. Increasing from very low spring densities, maxima in abundance and biomass were observed in late June/early July and September. The highest mean abundance recorded during the study was 7 x 10(3) Heliozoa L-1. Heliozoan abundance and biomass were higher in the epilimnion than in the hypolimnion. Actinophrys sol cells from this acidic lake were smaller than individuals of the same species found in other aquatic systems. 3. We determined the growth rate of A. sol using all potential prey items available in, and isolated and cultured from, Lake 111. Prey items included: single-celled and filamentous bacteria of unknown taxonomic affinity, the mixotrophic flagellates Chlamydomonas acidophila and Ochromonas sp., the ciliate Oxytricha sp. and the rotifers Elosa worallii and Cephalodella hoodi. Actinophrys sol fed over a wide-size spectrum from bacteria to metazoans. Positive growth was not supported by all naturally available prey. Actinophrys sol neither increased in cell number (k) nor biomass (k(b)) when starved, with low concentrations of single-celled bacteria or with the alga Ochromonas sp. Positive growth was achieved with single-celled bacteria (k = 0.22 +/- 0.02 d(-1); k(b) = -0.06 +/- 0.02 d(-1)) and filamentous bacteria (k = 0.52 +/- <0.01 d(-1); k(b) = 0.66 d(-1)) at concentrations greater than observed in situ, and the alga C. acidophila (up to k = 0.43 +/- 0.03 d(-1); k(b) = 0.44 +/- 0.04 d(-1)), the ciliate Oxytricha sp. (k = 0.34 +/- 0.01 d(-1)) and in mixed cultures containing rotifers and C. acidophila (k = 0.23 +/- 0.02-0.32 +/- 0.02 d(-1); maximum k(b) = 0.42 +/- 0.05 d(-1)). The individual- and biomass-based growth of A. sol was highest ... Article in Journal/Newspaper Antarc* Antarctic University of the Highlands and Islands: Research Database of UHI Antarctic Freshwater Biology 51 6 1149 1161 |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
topic |
SEASONAL DYNAMICS MIXOTROPHIC CHRYSOPHYTE MINING LAKES FOOD CAPTURE PLANKTON DYNAMICS MARITIME ANTARCTIC LAKE Marine & Freshwater Biology BACTERIA LIGHT-MICROSCOPY POTERIOOCHROMONAS-MALHAMENSIS PINACIOPHORA |
spellingShingle |
SEASONAL DYNAMICS MIXOTROPHIC CHRYSOPHYTE MINING LAKES FOOD CAPTURE PLANKTON DYNAMICS MARITIME ANTARCTIC LAKE Marine & Freshwater Biology BACTERIA LIGHT-MICROSCOPY POTERIOOCHROMONAS-MALHAMENSIS PINACIOPHORA Bell, Elanor M Weithoff, G Gaedke, U Temporal dynamics and growth of Actinophrys sol (Sarcodina:Heliozoa), the top predator in an extremely acidic lake |
topic_facet |
SEASONAL DYNAMICS MIXOTROPHIC CHRYSOPHYTE MINING LAKES FOOD CAPTURE PLANKTON DYNAMICS MARITIME ANTARCTIC LAKE Marine & Freshwater Biology BACTERIA LIGHT-MICROSCOPY POTERIOOCHROMONAS-MALHAMENSIS PINACIOPHORA |
description |
1. The in situ abundance, biomass and mean cell volume of Actinophrys sol (Sarcodina: Heliozoa), the top predator in an extremely acidic German mining lake (Lake 111; pH 2.65), were determined over three consecutive years (spring to autumn, 2001-03). 2. Actinophrys sol exhibited pronounced temporal and vertical patterns in abundance, biomass and mean cell volume. Increasing from very low spring densities, maxima in abundance and biomass were observed in late June/early July and September. The highest mean abundance recorded during the study was 7 x 10(3) Heliozoa L-1. Heliozoan abundance and biomass were higher in the epilimnion than in the hypolimnion. Actinophrys sol cells from this acidic lake were smaller than individuals of the same species found in other aquatic systems. 3. We determined the growth rate of A. sol using all potential prey items available in, and isolated and cultured from, Lake 111. Prey items included: single-celled and filamentous bacteria of unknown taxonomic affinity, the mixotrophic flagellates Chlamydomonas acidophila and Ochromonas sp., the ciliate Oxytricha sp. and the rotifers Elosa worallii and Cephalodella hoodi. Actinophrys sol fed over a wide-size spectrum from bacteria to metazoans. Positive growth was not supported by all naturally available prey. Actinophrys sol neither increased in cell number (k) nor biomass (k(b)) when starved, with low concentrations of single-celled bacteria or with the alga Ochromonas sp. Positive growth was achieved with single-celled bacteria (k = 0.22 +/- 0.02 d(-1); k(b) = -0.06 +/- 0.02 d(-1)) and filamentous bacteria (k = 0.52 +/- <0.01 d(-1); k(b) = 0.66 d(-1)) at concentrations greater than observed in situ, and the alga C. acidophila (up to k = 0.43 +/- 0.03 d(-1); k(b) = 0.44 +/- 0.04 d(-1)), the ciliate Oxytricha sp. (k = 0.34 +/- 0.01 d(-1)) and in mixed cultures containing rotifers and C. acidophila (k = 0.23 +/- 0.02-0.32 +/- 0.02 d(-1); maximum k(b) = 0.42 +/- 0.05 d(-1)). The individual- and biomass-based growth of A. sol was highest ... |
format |
Article in Journal/Newspaper |
author |
Bell, Elanor M Weithoff, G Gaedke, U |
author_facet |
Bell, Elanor M Weithoff, G Gaedke, U |
author_sort |
Bell, Elanor M |
title |
Temporal dynamics and growth of Actinophrys sol (Sarcodina:Heliozoa), the top predator in an extremely acidic lake |
title_short |
Temporal dynamics and growth of Actinophrys sol (Sarcodina:Heliozoa), the top predator in an extremely acidic lake |
title_full |
Temporal dynamics and growth of Actinophrys sol (Sarcodina:Heliozoa), the top predator in an extremely acidic lake |
title_fullStr |
Temporal dynamics and growth of Actinophrys sol (Sarcodina:Heliozoa), the top predator in an extremely acidic lake |
title_full_unstemmed |
Temporal dynamics and growth of Actinophrys sol (Sarcodina:Heliozoa), the top predator in an extremely acidic lake |
title_sort |
temporal dynamics and growth of actinophrys sol (sarcodina:heliozoa), the top predator in an extremely acidic lake |
publishDate |
2006 |
url |
https://pure.uhi.ac.uk/en/publications/44df38a8-3168-4f5c-bdfb-59c26d24d0e0 https://doi.org/10.1111/j.1365-2427.2006.01561.x |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Bell , E M , Weithoff , G & Gaedke , U 2006 , ' Temporal dynamics and growth of Actinophrys sol (Sarcodina : Heliozoa), the top predator in an extremely acidic lake ' , FRESHWATER BIOL , vol. 51 , no. 6 , pp. 1149-1161 . https://doi.org/10.1111/j.1365-2427.2006.01561.x |
op_relation |
https://pure.uhi.ac.uk/en/publications/44df38a8-3168-4f5c-bdfb-59c26d24d0e0 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1111/j.1365-2427.2006.01561.x |
container_title |
Freshwater Biology |
container_volume |
51 |
container_issue |
6 |
container_start_page |
1149 |
op_container_end_page |
1161 |
_version_ |
1802637902036860928 |