Trends in bird and seal populations as indicators of a system shift in the Southern Ocean
International audience Although world oceans have been warming over the past 50 years, the impact on biotic components is poorly understood because of the difficulty of obtaining long-term datasets on marine organisms. The Southern Ocean plays a critical role in global climate and there is growing e...
Main Authors: | , , , |
---|---|
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2003
|
Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-00189806 |
id |
fttriple:oai:gotriple.eu:10670/1.htyf7f |
---|---|
record_format |
openpolar |
spelling |
fttriple:oai:gotriple.eu:10670/1.htyf7f 2023-05-15T13:59:56+02:00 Trends in bird and seal populations as indicators of a system shift in the Southern Ocean Barbraud, Christophe Guinet, Christophe Inchausti, Pablo Weimerskirch, Henri Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) 2003-01-01 https://hal.archives-ouvertes.fr/hal-00189806 en eng HAL CCSD hal-00189806 10670/1.htyf7f https://hal.archives-ouvertes.fr/hal-00189806 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société antartic science antartic science, 2003, 15 (2), pp.249-256 Antarctic global warming seabirds sea-ice seals sub-Antarctic envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2003 fttriple 2023-01-22T17:57:23Z International audience Although world oceans have been warming over the past 50 years, the impact on biotic components is poorly understood because of the difficulty of obtaining long-term datasets on marine organisms. The Southern Ocean plays a critical role in global climate and there is growing evidence of climate warming. We show that air temperatures measured by meteorological stations have steadily increased over the past 50 years in the southern Indian Ocean, the increase starting in mid 1960s and stabilizing in mid 1980s, being particularly important in the sub-Antarctic sector. At the same time, with a time lag of 2–9 years with temperatures, the population size of most seabirds and seals monitored on several breeding sites have decreased severely, whilst two species have increased at the same time. These changes, together with indications of a simultaneous decrease in secondary production in sub-Antarctic waters and the reduction of sea-ice extent further south, indicate that a major system shift has occurred in the Indian Ocean part of the Southern Ocean. This shift illustrates the high sensitivity of marine ecosystems, and especially upper trophic level predators, to climatic changes. 8 pages Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Unknown Antarctic Indian Southern Ocean |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
Antarctic global warming seabirds sea-ice seals sub-Antarctic envir geo |
spellingShingle |
Antarctic global warming seabirds sea-ice seals sub-Antarctic envir geo Barbraud, Christophe Guinet, Christophe Inchausti, Pablo Weimerskirch, Henri Trends in bird and seal populations as indicators of a system shift in the Southern Ocean |
topic_facet |
Antarctic global warming seabirds sea-ice seals sub-Antarctic envir geo |
description |
International audience Although world oceans have been warming over the past 50 years, the impact on biotic components is poorly understood because of the difficulty of obtaining long-term datasets on marine organisms. The Southern Ocean plays a critical role in global climate and there is growing evidence of climate warming. We show that air temperatures measured by meteorological stations have steadily increased over the past 50 years in the southern Indian Ocean, the increase starting in mid 1960s and stabilizing in mid 1980s, being particularly important in the sub-Antarctic sector. At the same time, with a time lag of 2–9 years with temperatures, the population size of most seabirds and seals monitored on several breeding sites have decreased severely, whilst two species have increased at the same time. These changes, together with indications of a simultaneous decrease in secondary production in sub-Antarctic waters and the reduction of sea-ice extent further south, indicate that a major system shift has occurred in the Indian Ocean part of the Southern Ocean. This shift illustrates the high sensitivity of marine ecosystems, and especially upper trophic level predators, to climatic changes. 8 pages |
author2 |
Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Barbraud, Christophe Guinet, Christophe Inchausti, Pablo Weimerskirch, Henri |
author_facet |
Barbraud, Christophe Guinet, Christophe Inchausti, Pablo Weimerskirch, Henri |
author_sort |
Barbraud, Christophe |
title |
Trends in bird and seal populations as indicators of a system shift in the Southern Ocean |
title_short |
Trends in bird and seal populations as indicators of a system shift in the Southern Ocean |
title_full |
Trends in bird and seal populations as indicators of a system shift in the Southern Ocean |
title_fullStr |
Trends in bird and seal populations as indicators of a system shift in the Southern Ocean |
title_full_unstemmed |
Trends in bird and seal populations as indicators of a system shift in the Southern Ocean |
title_sort |
trends in bird and seal populations as indicators of a system shift in the southern ocean |
publisher |
HAL CCSD |
publishDate |
2003 |
url |
https://hal.archives-ouvertes.fr/hal-00189806 |
geographic |
Antarctic Indian Southern Ocean |
geographic_facet |
Antarctic Indian Southern Ocean |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société antartic science antartic science, 2003, 15 (2), pp.249-256 |
op_relation |
hal-00189806 10670/1.htyf7f https://hal.archives-ouvertes.fr/hal-00189806 |
op_rights |
undefined |
_version_ |
1766268852721680384 |