Microbial loop malfunctioning in the annual sea ice at Terra Nova Bay (Antarctica)
We investigated organic carbon quantity and biochemical composition, prokaryotic abundance, biomass and carbon production in the annual and platelet sea ice of Terra Nova Bay (Antarctica), as well as the downward fluxes of organic matter released by melting ice during early spring. Huge amounts of b...
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Online Access: | http://hdl.handle.net/11567/247944 https://doi.org/10.1007/s00300-008-0539-4 |
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ftunivgenova:oai:iris.unige.it:11567/247944 2024-04-21T07:48:29+00:00 Microbial loop malfunctioning in the annual sea ice at Terra Nova Bay (Antarctica) A. PUSCEDDU A. DELL'ANNO V. SAGGIOMO S. COZZI G. CATALANO L. GUGLIELMO VEZZULLI, LUIGI FABIANO, MAURO A., Pusceddu A., Dell'Anno Vezzulli, Luigi Fabiano, Mauro V., Saggiomo S., Cozzi G., Catalano L., Guglielmo 2009 STAMPA http://hdl.handle.net/11567/247944 https://doi.org/10.1007/s00300-008-0539-4 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000263389000003 volume:32 firstpage:337 lastpage:346 journal:POLAR BIOLOGY http://hdl.handle.net/11567/247944 doi:10.1007/s00300-008-0539-4 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-60549108732 info:eu-repo/semantics/article 2009 ftunivgenova https://doi.org/10.1007/s00300-008-0539-4 2024-03-28T01:16:29Z We investigated organic carbon quantity and biochemical composition, prokaryotic abundance, biomass and carbon production in the annual and platelet sea ice of Terra Nova Bay (Antarctica), as well as the downward fluxes of organic matter released by melting ice during early spring. Huge amounts of biopolymeric C accumulated in the bottom layer of the ice column concomitantly with the early spring increase in sympagic algal biomass. Such organic material, mostly accounted for by autotrophic biomass, was characterised by a high food quality and was rapidly exported to the sea bottom during sea ice melting. Prokaryote abundance (up to 1.3 9 109 cells L-1) and extracellular enzymatic activities (up to 24.3 lM h-1 for amino-peptidase activity) were extremely high, indicating high rates of organic C degradation in the bottom sea ice. Despite this, prokaryote C production values were very low (range 5–30 ng C L-1 h-1), suggesting that most of the degraded organic C was not channelled into prokaryote biomass. In the platelet ice, we found similar organic C concentrations, prokaryote abundance and biomass values and even higher extracellular enzymatic activities, but values of prokaryote C production (range 800– 4,200 ng C L-1 h-1) were up to three orders of magnitude higher than in the intact bottom sea ice. Additional field and laboratory experiments revealed that the dissolved organic material derived from algae accumulating in the bottom sea ice significantly reduced prokaryote C production, suggesting the presence of a potential allopathic control of sympagic algae on prokaryote growth. Article in Journal/Newspaper Antarc* Antarctica Sea ice Università degli Studi di Genova: CINECA IRIS Polar Biology 32 3 337 346 |
institution |
Open Polar |
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Università degli Studi di Genova: CINECA IRIS |
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ftunivgenova |
language |
English |
description |
We investigated organic carbon quantity and biochemical composition, prokaryotic abundance, biomass and carbon production in the annual and platelet sea ice of Terra Nova Bay (Antarctica), as well as the downward fluxes of organic matter released by melting ice during early spring. Huge amounts of biopolymeric C accumulated in the bottom layer of the ice column concomitantly with the early spring increase in sympagic algal biomass. Such organic material, mostly accounted for by autotrophic biomass, was characterised by a high food quality and was rapidly exported to the sea bottom during sea ice melting. Prokaryote abundance (up to 1.3 9 109 cells L-1) and extracellular enzymatic activities (up to 24.3 lM h-1 for amino-peptidase activity) were extremely high, indicating high rates of organic C degradation in the bottom sea ice. Despite this, prokaryote C production values were very low (range 5–30 ng C L-1 h-1), suggesting that most of the degraded organic C was not channelled into prokaryote biomass. In the platelet ice, we found similar organic C concentrations, prokaryote abundance and biomass values and even higher extracellular enzymatic activities, but values of prokaryote C production (range 800– 4,200 ng C L-1 h-1) were up to three orders of magnitude higher than in the intact bottom sea ice. Additional field and laboratory experiments revealed that the dissolved organic material derived from algae accumulating in the bottom sea ice significantly reduced prokaryote C production, suggesting the presence of a potential allopathic control of sympagic algae on prokaryote growth. |
author2 |
A., Pusceddu A., Dell'Anno Vezzulli, Luigi Fabiano, Mauro V., Saggiomo S., Cozzi G., Catalano L., Guglielmo |
format |
Article in Journal/Newspaper |
author |
A. PUSCEDDU A. DELL'ANNO V. SAGGIOMO S. COZZI G. CATALANO L. GUGLIELMO VEZZULLI, LUIGI FABIANO, MAURO |
spellingShingle |
A. PUSCEDDU A. DELL'ANNO V. SAGGIOMO S. COZZI G. CATALANO L. GUGLIELMO VEZZULLI, LUIGI FABIANO, MAURO Microbial loop malfunctioning in the annual sea ice at Terra Nova Bay (Antarctica) |
author_facet |
A. PUSCEDDU A. DELL'ANNO V. SAGGIOMO S. COZZI G. CATALANO L. GUGLIELMO VEZZULLI, LUIGI FABIANO, MAURO |
author_sort |
A. PUSCEDDU |
title |
Microbial loop malfunctioning in the annual sea ice at Terra Nova Bay (Antarctica) |
title_short |
Microbial loop malfunctioning in the annual sea ice at Terra Nova Bay (Antarctica) |
title_full |
Microbial loop malfunctioning in the annual sea ice at Terra Nova Bay (Antarctica) |
title_fullStr |
Microbial loop malfunctioning in the annual sea ice at Terra Nova Bay (Antarctica) |
title_full_unstemmed |
Microbial loop malfunctioning in the annual sea ice at Terra Nova Bay (Antarctica) |
title_sort |
microbial loop malfunctioning in the annual sea ice at terra nova bay (antarctica) |
publishDate |
2009 |
url |
http://hdl.handle.net/11567/247944 https://doi.org/10.1007/s00300-008-0539-4 |
genre |
Antarc* Antarctica Sea ice |
genre_facet |
Antarc* Antarctica Sea ice |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000263389000003 volume:32 firstpage:337 lastpage:346 journal:POLAR BIOLOGY http://hdl.handle.net/11567/247944 doi:10.1007/s00300-008-0539-4 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-60549108732 |
op_doi |
https://doi.org/10.1007/s00300-008-0539-4 |
container_title |
Polar Biology |
container_volume |
32 |
container_issue |
3 |
container_start_page |
337 |
op_container_end_page |
346 |
_version_ |
1796949864623374336 |