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...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | fra |
| Published: |
Éditions en environnement VertigO
2004-12-01
|
| Series: | VertigO |
| Subjects: | |
| Online Access: | https://journals.openedition.org/vertigo/3172 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1841552903466123264 |
|---|---|
| author | Gustavo Ferreyra Irene Schloss Serge Demers |
| author_facet | Gustavo Ferreyra Irene Schloss Serge Demers |
| author_sort | Gustavo Ferreyra |
| collection | DOAJ |
| 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 |
| id | doaj-art-7c2d808e4ee3411fbf89133418708941 |
| institution | Kabale University |
| issn | 1492-8442 |
| language | fra |
| publishDate | 2004-12-01 |
| publisher | Éditions en environnement VertigO |
| record_format | Article |
| series | VertigO |
| spelling | doaj-art-7c2d808e4ee3411fbf891334187089412025-01-09T12:40:10ZfraÉditions en environnement VertigOVertigO1492-84422004-12-015310.4000/vertigo.3172Rôle de la glace saisonnière dans la dynamique de l'écosystème marin de l'Antarctique : impact potentiel du changement climatique globalGustavo FerreyraIrene SchlossSerge DemersSeasonal 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.https://journals.openedition.org/vertigo/3172seasonal icemarginal icephytoplanktonkrillsalpsglobal change |
| spellingShingle | 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 VertigO seasonal ice marginal ice phytoplankton krill salps global change |
| title | 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_short | Rôle de la glace saisonnière dans la dynamique de l'écosystème marin de l'Antarctique : impact potentiel du changement climatique global |
| title_sort | role de la glace saisonniere dans la dynamique de l ecosysteme marin de l antarctique impact potentiel du changement climatique global |
| topic | seasonal ice marginal ice phytoplankton krill salps global change |
| url | https://journals.openedition.org/vertigo/3172 |
| work_keys_str_mv | AT gustavoferreyra roledelaglacesaisonnieredansladynamiquedelecosystememarindelantarctiqueimpactpotentielduchangementclimatiqueglobal AT ireneschloss roledelaglacesaisonnieredansladynamiquedelecosystememarindelantarctiqueimpactpotentielduchangementclimatiqueglobal AT sergedemers roledelaglacesaisonnieredansladynamiquedelecosystememarindelantarctiqueimpactpotentielduchangementclimatiqueglobal |