The distribution, abundance, status and global importance of giant petrels (Macronectes giganteus and M. halli) breeding at South Georgia
International audience Information on the status of giant petrels breeding at South Georgia was previously based on studies at a small number of the archipelago's breeding sites. Here, we report the results of the first complete archipelago-wide survey of breeding northern Macronectes halli and...
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Online Access: | https://hal.archives-ouvertes.fr/hal-02484159 https://doi.org/10.1007/s00300-019-02608-y |
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ftccsdartic:oai:HAL:hal-02484159v1 2023-05-15T13:53:20+02:00 The distribution, abundance, status and global importance of giant petrels (Macronectes giganteus and M. halli) breeding at South Georgia Poncet, Sally Wolfaardt, Anton Barbraud, Christophe Reyes-Arriagada, Ronnie Black, Andrew Powell, Robert Phillips, Richard Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Department of Computer Science Portland (CS) Portland State University Portland (PSU) British Antarctic Survey (BAS) Natural Environment Research Council (NERC) 2020-01 https://hal.archives-ouvertes.fr/hal-02484159 https://doi.org/10.1007/s00300-019-02608-y en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-019-02608-y hal-02484159 https://hal.archives-ouvertes.fr/hal-02484159 doi:10.1007/s00300-019-02608-y ISSN: 0722-4060 EISSN: 1432-2056 Polar Biology https://hal.archives-ouvertes.fr/hal-02484159 Polar Biology, Springer Verlag, 2020, 43 (1), pp.17-34. ⟨10.1007/s00300-019-02608-y⟩ Population trends Population size Allochrony Distribution patterns Macronectes giganteus Macronectes halli [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2020 ftccsdartic https://doi.org/10.1007/s00300-019-02608-y 2021-11-07T01:19:28Z International audience Information on the status of giant petrels breeding at South Georgia was previously based on studies at a small number of the archipelago's breeding sites. Here, we report the results of the first complete archipelago-wide survey of breeding northern Macronectes halli and southern M. giganteus giant petrels in the austral summers 2005/2006 and 2006/2007. We estimate that 15,398 pairs of northern and 8803 pairs of southern giant petrels bred at South Georgia. These are the largest and second largest populations at any island group, representing 71.0% and 17.3%, respectively, of updated global estimates of 21,682 pairs of northern and 50,819 pairs of southern giant petrels. A comparison of counts at locations surveyed in both 1986/1987–1987/1988 and 2005/2006–2006/2007 indicated increases of 74% and 27% in northern and southern giant petrels, respectively, over the intervening 18–20 years. The greater increase in northern giant petrels was likely influenced by the recovery of the Antarctic fur seal Arctocephalus gazella population at South Georgia, which provides an abundant but transient food resource (carrion). Due to allochrony, this provides greater benefits to northern giant petrels. The large, and increasing, population of king penguins Aptenodytes patagonicus at South Georgia also provides a potentially valuable food resource. The flexible and opportunistic foraging behaviour of giant petrels has contributed to their positive population trends. Other, more specialised, seabirds such as albatrosses have declined at South Georgia in recent decades mainly because of problems at sea, compounded by greater predation pressure from the increasing populations of giant petrels. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seal Arctocephalus gazella Giant Petrels King Penguins Macronectes giganteus Polar Biology Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Austral Giganteus ENVELOPE(62.500,62.500,-67.567,-67.567) The Antarctic Polar Biology 43 1 17 34 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Population trends Population size Allochrony Distribution patterns Macronectes giganteus Macronectes halli [SDE]Environmental Sciences |
spellingShingle |
Population trends Population size Allochrony Distribution patterns Macronectes giganteus Macronectes halli [SDE]Environmental Sciences Poncet, Sally Wolfaardt, Anton Barbraud, Christophe Reyes-Arriagada, Ronnie Black, Andrew Powell, Robert Phillips, Richard The distribution, abundance, status and global importance of giant petrels (Macronectes giganteus and M. halli) breeding at South Georgia |
topic_facet |
Population trends Population size Allochrony Distribution patterns Macronectes giganteus Macronectes halli [SDE]Environmental Sciences |
description |
International audience Information on the status of giant petrels breeding at South Georgia was previously based on studies at a small number of the archipelago's breeding sites. Here, we report the results of the first complete archipelago-wide survey of breeding northern Macronectes halli and southern M. giganteus giant petrels in the austral summers 2005/2006 and 2006/2007. We estimate that 15,398 pairs of northern and 8803 pairs of southern giant petrels bred at South Georgia. These are the largest and second largest populations at any island group, representing 71.0% and 17.3%, respectively, of updated global estimates of 21,682 pairs of northern and 50,819 pairs of southern giant petrels. A comparison of counts at locations surveyed in both 1986/1987–1987/1988 and 2005/2006–2006/2007 indicated increases of 74% and 27% in northern and southern giant petrels, respectively, over the intervening 18–20 years. The greater increase in northern giant petrels was likely influenced by the recovery of the Antarctic fur seal Arctocephalus gazella population at South Georgia, which provides an abundant but transient food resource (carrion). Due to allochrony, this provides greater benefits to northern giant petrels. The large, and increasing, population of king penguins Aptenodytes patagonicus at South Georgia also provides a potentially valuable food resource. The flexible and opportunistic foraging behaviour of giant petrels has contributed to their positive population trends. Other, more specialised, seabirds such as albatrosses have declined at South Georgia in recent decades mainly because of problems at sea, compounded by greater predation pressure from the increasing populations of giant petrels. |
author2 |
Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Department of Computer Science Portland (CS) Portland State University Portland (PSU) British Antarctic Survey (BAS) Natural Environment Research Council (NERC) |
format |
Article in Journal/Newspaper |
author |
Poncet, Sally Wolfaardt, Anton Barbraud, Christophe Reyes-Arriagada, Ronnie Black, Andrew Powell, Robert Phillips, Richard |
author_facet |
Poncet, Sally Wolfaardt, Anton Barbraud, Christophe Reyes-Arriagada, Ronnie Black, Andrew Powell, Robert Phillips, Richard |
author_sort |
Poncet, Sally |
title |
The distribution, abundance, status and global importance of giant petrels (Macronectes giganteus and M. halli) breeding at South Georgia |
title_short |
The distribution, abundance, status and global importance of giant petrels (Macronectes giganteus and M. halli) breeding at South Georgia |
title_full |
The distribution, abundance, status and global importance of giant petrels (Macronectes giganteus and M. halli) breeding at South Georgia |
title_fullStr |
The distribution, abundance, status and global importance of giant petrels (Macronectes giganteus and M. halli) breeding at South Georgia |
title_full_unstemmed |
The distribution, abundance, status and global importance of giant petrels (Macronectes giganteus and M. halli) breeding at South Georgia |
title_sort |
distribution, abundance, status and global importance of giant petrels (macronectes giganteus and m. halli) breeding at south georgia |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.archives-ouvertes.fr/hal-02484159 https://doi.org/10.1007/s00300-019-02608-y |
long_lat |
ENVELOPE(62.500,62.500,-67.567,-67.567) |
geographic |
Antarctic Austral Giganteus The Antarctic |
geographic_facet |
Antarctic Austral Giganteus The Antarctic |
genre |
Antarc* Antarctic Antarctic Fur Seal Arctocephalus gazella Giant Petrels King Penguins Macronectes giganteus Polar Biology |
genre_facet |
Antarc* Antarctic Antarctic Fur Seal Arctocephalus gazella Giant Petrels King Penguins Macronectes giganteus Polar Biology |
op_source |
ISSN: 0722-4060 EISSN: 1432-2056 Polar Biology https://hal.archives-ouvertes.fr/hal-02484159 Polar Biology, Springer Verlag, 2020, 43 (1), pp.17-34. ⟨10.1007/s00300-019-02608-y⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-019-02608-y hal-02484159 https://hal.archives-ouvertes.fr/hal-02484159 doi:10.1007/s00300-019-02608-y |
op_doi |
https://doi.org/10.1007/s00300-019-02608-y |
container_title |
Polar Biology |
container_volume |
43 |
container_issue |
1 |
container_start_page |
17 |
op_container_end_page |
34 |
_version_ |
1766258384646963200 |