Exopolymer particles: microbial hotspots of enhanced bacterial activity in Arctic fast ice (Chukchi Sea)
Sea ice is an important structuring element of Arctic marine ecosystems and provides avast low-temperature habitat for ice-associated bacteria. While it is now known that sea icesequesters large amounts of extracellular polymeric substances (EPS) contributing significantly to itsparticulate organic...
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ftunivtasecite:oai:ecite.utas.edu.au:54795 2023-05-15T14:25:28+02:00 Exopolymer particles: microbial hotspots of enhanced bacterial activity in Arctic fast ice (Chukchi Sea) Meiners, K Krembs, C Gradinger, R 2008 application/pdf http://www.int-res.com/ https://doi.org/10.3354/ame01214 http://ecite.utas.edu.au/54795 en eng Inter-Research http://ecite.utas.edu.au/54795/1/Meinersetal2008.pdf http://dx.doi.org/10.3354/ame01214 Meiners, K and Krembs, C and Gradinger, R, Exopolymer particles: microbial hotspots of enhanced bacterial activity in Arctic fast ice (Chukchi Sea), Aquatic Microbial Ecology, 52, (2) pp. 195-207. ISSN 0948-3055 (2008) [Refereed Article] http://ecite.utas.edu.au/54795 Biological Sciences Microbiology Bacteriology Refereed Article PeerReviewed 2008 ftunivtasecite https://doi.org/10.3354/ame01214 2019-12-13T21:27:34Z Sea ice is an important structuring element of Arctic marine ecosystems and provides avast low-temperature habitat for ice-associated bacteria. While it is now known that sea icesequesters large amounts of extracellular polymeric substances (EPS) contributing significantly to itsparticulate organic carbon pool, the ecological role of EPS in sea ice is poorly understood. Using insitu incubations combined with a newly developed triple-staining method (Alcian Blue, DAPI, CTC),we determined the number of CTC-reducing (i.e. actively respiring) sea-ice bacteria living freely orattached to gel-like exopolymer particles. Samples were collected at 6 depths from Chukchi Seacoastal fast ice in April, May and June 2003. Concentrations of exopolymer particles ranged between1.8 106 and 149.1 106 particles l1 (average 4.7 106 particles l1) and showed strong vertical gradientswith maximum concentrations at the ice-water interface. Total bacterial numbers (TBN)ranged from 0.18 109 to 8.48 109 cells l1 with an average fraction of 7.4% of actively respiring cells(range 3.0 to 17.2% of TBN). The attached bacterial fraction (range 4.6 to 28.5%, average 15.0% ofTBN) showed a significantly, approximately 4 times higher proportion of actively respiring cells(average 19.6%, range 7.8 to 37.6%) when compared to the free-living fraction that had an averageof 5.4% (range 1.1 to 11.2%) of actively respiring cells. In conclusion, exopolymer particles in sea iceare microbial hotspots of increased bacterial activity able to foster enhanced biogeochemical cycling. Article in Journal/Newspaper Arctic Arctic Chukchi Chukchi Sea Sea ice eCite UTAS (University of Tasmania) Arctic Chukchi Sea Aquatic Microbial Ecology 52 195 207 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Microbiology Bacteriology |
spellingShingle |
Biological Sciences Microbiology Bacteriology Meiners, K Krembs, C Gradinger, R Exopolymer particles: microbial hotspots of enhanced bacterial activity in Arctic fast ice (Chukchi Sea) |
topic_facet |
Biological Sciences Microbiology Bacteriology |
description |
Sea ice is an important structuring element of Arctic marine ecosystems and provides avast low-temperature habitat for ice-associated bacteria. While it is now known that sea icesequesters large amounts of extracellular polymeric substances (EPS) contributing significantly to itsparticulate organic carbon pool, the ecological role of EPS in sea ice is poorly understood. Using insitu incubations combined with a newly developed triple-staining method (Alcian Blue, DAPI, CTC),we determined the number of CTC-reducing (i.e. actively respiring) sea-ice bacteria living freely orattached to gel-like exopolymer particles. Samples were collected at 6 depths from Chukchi Seacoastal fast ice in April, May and June 2003. Concentrations of exopolymer particles ranged between1.8 106 and 149.1 106 particles l1 (average 4.7 106 particles l1) and showed strong vertical gradientswith maximum concentrations at the ice-water interface. Total bacterial numbers (TBN)ranged from 0.18 109 to 8.48 109 cells l1 with an average fraction of 7.4% of actively respiring cells(range 3.0 to 17.2% of TBN). The attached bacterial fraction (range 4.6 to 28.5%, average 15.0% ofTBN) showed a significantly, approximately 4 times higher proportion of actively respiring cells(average 19.6%, range 7.8 to 37.6%) when compared to the free-living fraction that had an averageof 5.4% (range 1.1 to 11.2%) of actively respiring cells. In conclusion, exopolymer particles in sea iceare microbial hotspots of increased bacterial activity able to foster enhanced biogeochemical cycling. |
format |
Article in Journal/Newspaper |
author |
Meiners, K Krembs, C Gradinger, R |
author_facet |
Meiners, K Krembs, C Gradinger, R |
author_sort |
Meiners, K |
title |
Exopolymer particles: microbial hotspots of enhanced bacterial activity in Arctic fast ice (Chukchi Sea) |
title_short |
Exopolymer particles: microbial hotspots of enhanced bacterial activity in Arctic fast ice (Chukchi Sea) |
title_full |
Exopolymer particles: microbial hotspots of enhanced bacterial activity in Arctic fast ice (Chukchi Sea) |
title_fullStr |
Exopolymer particles: microbial hotspots of enhanced bacterial activity in Arctic fast ice (Chukchi Sea) |
title_full_unstemmed |
Exopolymer particles: microbial hotspots of enhanced bacterial activity in Arctic fast ice (Chukchi Sea) |
title_sort |
exopolymer particles: microbial hotspots of enhanced bacterial activity in arctic fast ice (chukchi sea) |
publisher |
Inter-Research |
publishDate |
2008 |
url |
http://www.int-res.com/ https://doi.org/10.3354/ame01214 http://ecite.utas.edu.au/54795 |
geographic |
Arctic Chukchi Sea |
geographic_facet |
Arctic Chukchi Sea |
genre |
Arctic Arctic Chukchi Chukchi Sea Sea ice |
genre_facet |
Arctic Arctic Chukchi Chukchi Sea Sea ice |
op_relation |
http://ecite.utas.edu.au/54795/1/Meinersetal2008.pdf http://dx.doi.org/10.3354/ame01214 Meiners, K and Krembs, C and Gradinger, R, Exopolymer particles: microbial hotspots of enhanced bacterial activity in Arctic fast ice (Chukchi Sea), Aquatic Microbial Ecology, 52, (2) pp. 195-207. ISSN 0948-3055 (2008) [Refereed Article] http://ecite.utas.edu.au/54795 |
op_doi |
https://doi.org/10.3354/ame01214 |
container_title |
Aquatic Microbial Ecology |
container_volume |
52 |
container_start_page |
195 |
op_container_end_page |
207 |
_version_ |
1766297854512463872 |