Total and hydrolizable particulate organic matter (carbohydrates, proteins and lipids) at a coastal station in Terra Nova Bay (Ross Sea, Antarctica)
We analysed quantity and quality of particulate organic matter during the austral summer 1994/1995 at a coastal station in Terra Nova Bay (Ross Sea, Ant- arctica). Our main aims were to investigate the origin and biochemical composition of particulate organic matter (POM), to measure its availabilit...
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ftunicagliariris:oai:iris.unica.it:11584/123597 2024-04-21T07:48:30+00:00 Total and hydrolizable particulate organic matter (carbohydrates, proteins and lipids) at a coastal station in Terra Nova Bay (Ross Sea, Antarctica) FABIANO M. PUSCEDDU, ANTONIO Fabiano, M. Pusceddu, Antonio 1998 http://hdl.handle.net/11584/123597 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000071833500007 volume:19 firstpage:125 lastpage:132 numberofpages:8 journal:POLAR BIOLOGY http://hdl.handle.net/11584/123597 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0031913079 info:eu-repo/semantics/article 1998 ftunicagliariris 2024-03-25T16:19:40Z We analysed quantity and quality of particulate organic matter during the austral summer 1994/1995 at a coastal station in Terra Nova Bay (Ross Sea, Ant- arctica). Our main aims were to investigate the origin and biochemical composition of particulate organic matter (POM), to measure its availability for consumers through the study of its digestible fraction (measured by using di€erent enzymes separately) and to highlight the role of hydrolizable compounds in the organic matter diagenesis in the coastal waters at Terra Nova Bay. Temporal and spatial patterns of chlorophyll-a concentrations were re ̄ected by the particulate organic carbon, nitrogen and total biopolymeric carbon concentrations, suggesting that most POM originated directly from phytoplankton. The most evident feature of POM in the coastal waters at Terra Nova Bay was the dominance of proteins (on average 57% of total biopolymeric particulate carbon), followed by carbohydrates (25%) and lipids (18%). We found that about 30% of the refractory particulate organic carbon (assumed to be present only after the complete exploitation of particulate organic nitrogen) did not originate from biopolymeric carbon (as sum of carbohydrate, protein and lipid carbon). This allows us to suggest the use of the digestible fraction of particulate biopolymeric carbon as a more accurate measure of the food availability of POM for consumers. In Terra Nova Bay coastal waters, most of the particulate protein pool was associated with large phytoplankton cells or phytodetritus. As a result, the protein pool appeared less available (i.e. less digestible) than the one present in oligotrophic waters where, conversely, most particulate organic nitrogen is sequestered into bacteria. The relative low availability of the protein pool, together with the rapid sinking of POM and the low remineralization rates of benthic heterotrophic microbes, are suggested as possible factors in determining the ``ineciency'' in organic matter recycling of coastal waters at Terra Nova Bay, which ... Article in Journal/Newspaper Antarc* Antarctica Ross Sea Università degli Studi di Cagliari: UNICA IRIS |
institution |
Open Polar |
collection |
Università degli Studi di Cagliari: UNICA IRIS |
op_collection_id |
ftunicagliariris |
language |
English |
description |
We analysed quantity and quality of particulate organic matter during the austral summer 1994/1995 at a coastal station in Terra Nova Bay (Ross Sea, Ant- arctica). Our main aims were to investigate the origin and biochemical composition of particulate organic matter (POM), to measure its availability for consumers through the study of its digestible fraction (measured by using di€erent enzymes separately) and to highlight the role of hydrolizable compounds in the organic matter diagenesis in the coastal waters at Terra Nova Bay. Temporal and spatial patterns of chlorophyll-a concentrations were re ̄ected by the particulate organic carbon, nitrogen and total biopolymeric carbon concentrations, suggesting that most POM originated directly from phytoplankton. The most evident feature of POM in the coastal waters at Terra Nova Bay was the dominance of proteins (on average 57% of total biopolymeric particulate carbon), followed by carbohydrates (25%) and lipids (18%). We found that about 30% of the refractory particulate organic carbon (assumed to be present only after the complete exploitation of particulate organic nitrogen) did not originate from biopolymeric carbon (as sum of carbohydrate, protein and lipid carbon). This allows us to suggest the use of the digestible fraction of particulate biopolymeric carbon as a more accurate measure of the food availability of POM for consumers. In Terra Nova Bay coastal waters, most of the particulate protein pool was associated with large phytoplankton cells or phytodetritus. As a result, the protein pool appeared less available (i.e. less digestible) than the one present in oligotrophic waters where, conversely, most particulate organic nitrogen is sequestered into bacteria. The relative low availability of the protein pool, together with the rapid sinking of POM and the low remineralization rates of benthic heterotrophic microbes, are suggested as possible factors in determining the ``ineciency'' in organic matter recycling of coastal waters at Terra Nova Bay, which ... |
author2 |
Fabiano, M. Pusceddu, Antonio |
format |
Article in Journal/Newspaper |
author |
FABIANO M. PUSCEDDU, ANTONIO |
spellingShingle |
FABIANO M. PUSCEDDU, ANTONIO Total and hydrolizable particulate organic matter (carbohydrates, proteins and lipids) at a coastal station in Terra Nova Bay (Ross Sea, Antarctica) |
author_facet |
FABIANO M. PUSCEDDU, ANTONIO |
author_sort |
FABIANO M. |
title |
Total and hydrolizable particulate organic matter (carbohydrates, proteins and lipids) at a coastal station in Terra Nova Bay (Ross Sea, Antarctica) |
title_short |
Total and hydrolizable particulate organic matter (carbohydrates, proteins and lipids) at a coastal station in Terra Nova Bay (Ross Sea, Antarctica) |
title_full |
Total and hydrolizable particulate organic matter (carbohydrates, proteins and lipids) at a coastal station in Terra Nova Bay (Ross Sea, Antarctica) |
title_fullStr |
Total and hydrolizable particulate organic matter (carbohydrates, proteins and lipids) at a coastal station in Terra Nova Bay (Ross Sea, Antarctica) |
title_full_unstemmed |
Total and hydrolizable particulate organic matter (carbohydrates, proteins and lipids) at a coastal station in Terra Nova Bay (Ross Sea, Antarctica) |
title_sort |
total and hydrolizable particulate organic matter (carbohydrates, proteins and lipids) at a coastal station in terra nova bay (ross sea, antarctica) |
publishDate |
1998 |
url |
http://hdl.handle.net/11584/123597 |
genre |
Antarc* Antarctica Ross Sea |
genre_facet |
Antarc* Antarctica Ross Sea |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000071833500007 volume:19 firstpage:125 lastpage:132 numberofpages:8 journal:POLAR BIOLOGY http://hdl.handle.net/11584/123597 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0031913079 |
_version_ |
1796949895011106816 |