NITROGEN METABOLISM OF THE ANTARCTIC BIVALVE LATERNULA ELLIPTICA (KING & BRODERIP) AND ITS POTENTIAL USE AS BIOMARKER
The Antarctic marine environment is characterized by the extreme seasonality of the primary production in the water column and the low but stable temperatures. Both are considered the main factors in the adaptative evolution of Antarctic ectothermic organisms. Studies about physiological and biochem...
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ftjob:oai:www.revistas.ufrj.br:article/8058 2023-05-15T13:59:31+02:00 NITROGEN METABOLISM OF THE ANTARCTIC BIVALVE LATERNULA ELLIPTICA (KING & BRODERIP) AND ITS POTENTIAL USE AS BIOMARKER METABOLISMO NITROGENADO DO BIVALVE ANTÁRTICO LATERNULA ELLIPTICA (KING & BRODERIP) E O SEU USO POTENCIAL COMO BIOMARCADOR. Rodrigues, Edson Vani, Gannabathula Sree Lavrado, Helena Passeri 2017-02-20 application/pdf https://revistas.ufrj.br/index.php/oa/article/view/8058 por por Associação Brasileira de Ciência Ecológica e Conservação https://revistas.ufrj.br/index.php/oa/article/view/8058/6502 https://revistas.ufrj.br/index.php/oa/article/view/8058 Copyright (c) 2017 Oecologia Australis http://creativecommons.org/licenses/by-nc/4.0 CC-BY-NC Oecologia Australis; Vol 11, No 1 (2007): Oecologia Brasiliensis - Ecologia Antártica; 37-49 2177-6199 Antarctica benthos Laternula elliptica arginase metabolism ecophysiology biomarkers heavy metals Antartica bentos metabolismo ecofisiologia biomarcadores metais pesados info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftjob 2021-12-19T13:30:01Z The Antarctic marine environment is characterized by the extreme seasonality of the primary production in the water column and the low but stable temperatures. Both are considered the main factors in the adaptative evolution of Antarctic ectothermic organisms. Studies about physiological and biochemical processes of the cold-adapted species revealed the presence of antifreeze glycoproteins in the biological fluids and cold-adapted proteins. The low and stable temperatures have resulted in the appearence of enzymes with high catalytic efficiency and the absence of the thermal stress proteins in some Antarctic fishes. The austral winter promotes a seasonal food shortage, submitting the benthic ectotherms to long periods of starvation. This is particularly true for the organisms that depend on phytoplankton as their primary source of food. The Antarctic marine environment also presents areas of high copper concentrations on the sediment surface as well as cadmium in the water column. The bivalve Laternula elliptica, a circumpolar species, has been proposed as bioindicator for long term monitoring of heavy metals in the shallow waters of Antarctica due to its capacity to accumulate metals, especially cadmium and zinc. Like other Antarctic ectothermic organisms, L. elliptica changes its metabolism from aerobic to anaerobic as a function of temperature, being 6 ºC critical and 9 ºC lethal. This bivalve also shows a marked seasonality in its metabolism, with low oxygen consumption in winter as compared to summer. It is speculated that it enters into a dormancy state during the austral winter as it apparently retracts its siphons below the sediment surface. The apparent supression of the water pumping by the siphons during winter forces L. elliptica to mobilize its energy reserves, using the siphon proteins as its principal source of energy (ratio of oxygen consumption/excreted nitrogen = 3.0). Even during summer, when the high food supply stimulates the bivalve growth, the metabolism is mainly protein based. (O:N ratio ... Article in Journal/Newspaper Antarc* Antarctic Antarctica antartic* Unknown Antarctic Austral The Antarctic |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftjob |
language |
Portuguese |
topic |
Antarctica benthos Laternula elliptica arginase metabolism ecophysiology biomarkers heavy metals Antartica bentos metabolismo ecofisiologia biomarcadores metais pesados |
spellingShingle |
Antarctica benthos Laternula elliptica arginase metabolism ecophysiology biomarkers heavy metals Antartica bentos metabolismo ecofisiologia biomarcadores metais pesados Rodrigues, Edson Vani, Gannabathula Sree Lavrado, Helena Passeri NITROGEN METABOLISM OF THE ANTARCTIC BIVALVE LATERNULA ELLIPTICA (KING & BRODERIP) AND ITS POTENTIAL USE AS BIOMARKER |
topic_facet |
Antarctica benthos Laternula elliptica arginase metabolism ecophysiology biomarkers heavy metals Antartica bentos metabolismo ecofisiologia biomarcadores metais pesados |
description |
The Antarctic marine environment is characterized by the extreme seasonality of the primary production in the water column and the low but stable temperatures. Both are considered the main factors in the adaptative evolution of Antarctic ectothermic organisms. Studies about physiological and biochemical processes of the cold-adapted species revealed the presence of antifreeze glycoproteins in the biological fluids and cold-adapted proteins. The low and stable temperatures have resulted in the appearence of enzymes with high catalytic efficiency and the absence of the thermal stress proteins in some Antarctic fishes. The austral winter promotes a seasonal food shortage, submitting the benthic ectotherms to long periods of starvation. This is particularly true for the organisms that depend on phytoplankton as their primary source of food. The Antarctic marine environment also presents areas of high copper concentrations on the sediment surface as well as cadmium in the water column. The bivalve Laternula elliptica, a circumpolar species, has been proposed as bioindicator for long term monitoring of heavy metals in the shallow waters of Antarctica due to its capacity to accumulate metals, especially cadmium and zinc. Like other Antarctic ectothermic organisms, L. elliptica changes its metabolism from aerobic to anaerobic as a function of temperature, being 6 ºC critical and 9 ºC lethal. This bivalve also shows a marked seasonality in its metabolism, with low oxygen consumption in winter as compared to summer. It is speculated that it enters into a dormancy state during the austral winter as it apparently retracts its siphons below the sediment surface. The apparent supression of the water pumping by the siphons during winter forces L. elliptica to mobilize its energy reserves, using the siphon proteins as its principal source of energy (ratio of oxygen consumption/excreted nitrogen = 3.0). Even during summer, when the high food supply stimulates the bivalve growth, the metabolism is mainly protein based. (O:N ratio ... |
format |
Article in Journal/Newspaper |
author |
Rodrigues, Edson Vani, Gannabathula Sree Lavrado, Helena Passeri |
author_facet |
Rodrigues, Edson Vani, Gannabathula Sree Lavrado, Helena Passeri |
author_sort |
Rodrigues, Edson |
title |
NITROGEN METABOLISM OF THE ANTARCTIC BIVALVE LATERNULA ELLIPTICA (KING & BRODERIP) AND ITS POTENTIAL USE AS BIOMARKER |
title_short |
NITROGEN METABOLISM OF THE ANTARCTIC BIVALVE LATERNULA ELLIPTICA (KING & BRODERIP) AND ITS POTENTIAL USE AS BIOMARKER |
title_full |
NITROGEN METABOLISM OF THE ANTARCTIC BIVALVE LATERNULA ELLIPTICA (KING & BRODERIP) AND ITS POTENTIAL USE AS BIOMARKER |
title_fullStr |
NITROGEN METABOLISM OF THE ANTARCTIC BIVALVE LATERNULA ELLIPTICA (KING & BRODERIP) AND ITS POTENTIAL USE AS BIOMARKER |
title_full_unstemmed |
NITROGEN METABOLISM OF THE ANTARCTIC BIVALVE LATERNULA ELLIPTICA (KING & BRODERIP) AND ITS POTENTIAL USE AS BIOMARKER |
title_sort |
nitrogen metabolism of the antarctic bivalve laternula elliptica (king & broderip) and its potential use as biomarker |
publisher |
Associação Brasileira de Ciência Ecológica e Conservação |
publishDate |
2017 |
url |
https://revistas.ufrj.br/index.php/oa/article/view/8058 |
geographic |
Antarctic Austral The Antarctic |
geographic_facet |
Antarctic Austral The Antarctic |
genre |
Antarc* Antarctic Antarctica antartic* |
genre_facet |
Antarc* Antarctic Antarctica antartic* |
op_source |
Oecologia Australis; Vol 11, No 1 (2007): Oecologia Brasiliensis - Ecologia Antártica; 37-49 2177-6199 |
op_relation |
https://revistas.ufrj.br/index.php/oa/article/view/8058/6502 https://revistas.ufrj.br/index.php/oa/article/view/8058 |
op_rights |
Copyright (c) 2017 Oecologia Australis http://creativecommons.org/licenses/by-nc/4.0 |
op_rightsnorm |
CC-BY-NC |
_version_ |
1766268087883005952 |