Rôle de la glace saisonnière dans la dynamique de l'écosystème marin de l'Antarctique : impact potentiel du changement climatique global

Seasonal ice cover is linked to an intense biological activity in polar regions. Every year, ice melting induces the stabilisation of the water column which can be observed until 150 km from the margin of seasonal ice, favoring the development of profuse phytoplankton blooms. For the case of Antarct...

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Autores principales:	Gustavo Ferreyra, Irene Schloss, Serge Demers
Formato:	article
Lenguaje:	FR
Publicado:	Éditions en environnement VertigO 2004
Materias:	global change krill marginal ice phytoplankton salps seasonal ice Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/b83bf4e4bb4449a3a614a63be2b7bbc8
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spelling	oai:doaj.org-article:b83bf4e4bb4449a3a614a63be2b7bbc82021-12-02T10:02:26ZRôle de la glace saisonnière dans la dynamique de l'écosystème marin de l'Antarctique : impact potentiel du changement climatique global1492-844210.4000/vertigo.3172https://doaj.org/article/b83bf4e4bb4449a3a614a63be2b7bbc82004-12-01T00:00:00Zhttp://journals.openedition.org/vertigo/3172https://doaj.org/toc/1492-8442Seasonal ice cover is linked to an intense biological activity in polar regions. Every year, ice melting induces the stabilisation of the water column which can be observed until 150 km from the margin of seasonal ice, favoring the development of profuse phytoplankton blooms. For the case of Antarctica, life cycles of key species in the ecosystem, particularly the krill Euphausia superba, strongly depends on ice dynamics. This species has been considered as the main link between phytoplankton and higher trophic levels in the food web (fishes, birds and mammals). Several field observations as well as models suggest a replacement of krill by another group of organisms: the salps (particularly Salpa thompsoni). Such replacement has been related to the decrease in duration and extent of seasonal ice during the last decades, which in turn shows a strong correlation with the air temperature increase in some areas of Antarctica (Amundsen – Bellingshausen seas and Antarctic Peninsula). These changes could have significant consequences for both the biodiversity and the functioning of the Antarctic ecosystem, since salps represent a low energy source for high predators. The potential significance of the above processes on Antarctic ecosystem dynamics is analysed in the present paper.Gustavo FerreyraIrene SchlossSerge DemersÉditions en environnement VertigOarticleglobal changekrillmarginal icephytoplanktonsalpsseasonal iceEnvironmental sciencesGE1-350FRVertigO, Vol 5, Iss 3 (2004)
institution	DOAJ
collection	DOAJ
language	FR
topic	global change krill marginal ice phytoplankton salps seasonal ice Environmental sciences GE1-350
spellingShingle	global change krill marginal ice phytoplankton salps seasonal ice Environmental sciences GE1-350 Gustavo Ferreyra Irene Schloss Serge Demers Rôle de la glace saisonnière dans la dynamique de l'écosystème marin de l'Antarctique : impact potentiel du changement climatique global
description	Seasonal ice cover is linked to an intense biological activity in polar regions. Every year, ice melting induces the stabilisation of the water column which can be observed until 150 km from the margin of seasonal ice, favoring the development of profuse phytoplankton blooms. For the case of Antarctica, life cycles of key species in the ecosystem, particularly the krill Euphausia superba, strongly depends on ice dynamics. This species has been considered as the main link between phytoplankton and higher trophic levels in the food web (fishes, birds and mammals). Several field observations as well as models suggest a replacement of krill by another group of organisms: the salps (particularly Salpa thompsoni). Such replacement has been related to the decrease in duration and extent of seasonal ice during the last decades, which in turn shows a strong correlation with the air temperature increase in some areas of Antarctica (Amundsen – Bellingshausen seas and Antarctic Peninsula). These changes could have significant consequences for both the biodiversity and the functioning of the Antarctic ecosystem, since salps represent a low energy source for high predators. The potential significance of the above processes on Antarctic ecosystem dynamics is analysed in the present paper.
format	article
author	Gustavo Ferreyra Irene Schloss Serge Demers
author_facet	Gustavo Ferreyra Irene Schloss Serge Demers
author_sort	Gustavo Ferreyra
title	Rôle de la glace saisonnière dans la dynamique de l'écosystème marin de l'Antarctique : impact potentiel du changement climatique global
title_short	Rôle de la glace saisonnière dans la dynamique de l'écosystème marin de l'Antarctique : impact potentiel du changement climatique global
title_full	Rôle de la glace saisonnière dans la dynamique de l'écosystème marin de l'Antarctique : impact potentiel du changement climatique global
title_fullStr	Rôle de la glace saisonnière dans la dynamique de l'écosystème marin de l'Antarctique : impact potentiel du changement climatique global
title_full_unstemmed	Rôle de la glace saisonnière dans la dynamique de l'écosystème marin de l'Antarctique : impact potentiel du changement climatique global
title_sort	rôle de la glace saisonnière dans la dynamique de l'écosystème marin de l'antarctique : impact potentiel du changement climatique global
publisher	Éditions en environnement VertigO
publishDate	2004
url	https://doaj.org/article/b83bf4e4bb4449a3a614a63be2b7bbc8
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Rôle de la glace saisonnière dans la dynamique de l'écosystème marin de l'Antarctique : impact potentiel du changement climatique global

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