Recent population estimates and trends in numbers of albatrosses and giant petrels breeding at the sub-Antarctic Prince Edward Islands
The second mid-summer survey of surface-nesting seabirds at the Prince Edward Island group (Marion and Prince Edward islands) was conducted during December 2008, seven years after the initial mid-summer survey. Wandering albatrosses Diomedea exulans may have decreased slightly at Prince Edward Islan...
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ftjafricanj:oai:ojs.ajol.info:article/49217 2023-05-15T13:37:10+02:00 Recent population estimates and trends in numbers of albatrosses and giant petrels breeding at the sub-Antarctic Prince Edward Islands Ryan, PG Jones, MGW Dyer, BM Upfold, L Crawford, RJM 2009-12-18 application/pdf http://www.ajol.info/index.php/ajms/article/view/49217 eng eng NISC http://www.ajol.info/index.php/ajms/article/view/49217/35558 http://www.ajol.info/index.php/ajms/article/view/49217 Copyright for articles published in this journal is retained by the publisher. African Journal of Marine Science; Vol 31, No 3 (2009) 1814-232X info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2009 ftjafricanj 2017-03-05T06:40:41Z The second mid-summer survey of surface-nesting seabirds at the Prince Edward Island group (Marion and Prince Edward islands) was conducted during December 2008, seven years after the initial mid-summer survey. Wandering albatrosses Diomedea exulans may have decreased slightly at Prince Edward Island, mirroring a decrease of roughly 2% per year at Marion Island from 1998 to 2005, a decline that has since reversed. Numbers of grey-headed albatrosses Thalassarche chrysostoma on Marion Island have remained stable, whereas the population on Prince Edward Island decreased by 20% from 2001 to 2008 (3% per year). The estimate of Indian yellow-nosed albatrosses T. carteri at Prince Edward Island was similar in 2001 and 2008. Counts of both sooty albatrosses Phoebetria spp. were substantially higher at Prince Edward Island in 2008, possibly as a result of better coverage compared to 2001. Dark-mantled sooty albatrosses P. fusca on Marion Island have decreased by almost 2% per year since 1996, continuing a negative trend from the early 1980s, whereas light-mantled sooty albatrosses P. palpebrata have increased by almost 6% per year at Marion Island since 1996. Counts of both giant petrels increased at Prince Edward Island (northern Macronectes halli by 44%; southern M. giganteus by 28%), whereas their numbers have remained stable at Marion Island. Current best estimates for annual breeding populations (pairs) at the two islands are 3 650 wandering albatrosses, 9 500 grey-headed albatrosses, 7 000 Indian yellow-nosed albatrosses, 2 900 dark-mantled sooty albatrosses, 800 lightmantled sooty albatrosses, 750 northern giant petrels and 2 800 southern giant petrels, confirming the global importance of the Prince Edward Islands for these seven species. Apart from the dark-mantled sooty albatross, their populations are reasonably healthy despite fishing mortality.Keywords: Diomedea; Macronectes; Marion Island; population size; population trends; Phoebetria; Prince Edward Island; ThalassarcheAfrican Journal of Marine Science 2009, 31(3): 409–417 Article in Journal/Newspaper Antarc* Antarctic Diomedea exulans Giant Petrels Marion Island Prince Edward Islands Prince Edward Island AJOL - African Journals Online Antarctic Indian Giganteus ENVELOPE(62.500,62.500,-67.567,-67.567) |
institution |
Open Polar |
collection |
AJOL - African Journals Online |
op_collection_id |
ftjafricanj |
language |
English |
description |
The second mid-summer survey of surface-nesting seabirds at the Prince Edward Island group (Marion and Prince Edward islands) was conducted during December 2008, seven years after the initial mid-summer survey. Wandering albatrosses Diomedea exulans may have decreased slightly at Prince Edward Island, mirroring a decrease of roughly 2% per year at Marion Island from 1998 to 2005, a decline that has since reversed. Numbers of grey-headed albatrosses Thalassarche chrysostoma on Marion Island have remained stable, whereas the population on Prince Edward Island decreased by 20% from 2001 to 2008 (3% per year). The estimate of Indian yellow-nosed albatrosses T. carteri at Prince Edward Island was similar in 2001 and 2008. Counts of both sooty albatrosses Phoebetria spp. were substantially higher at Prince Edward Island in 2008, possibly as a result of better coverage compared to 2001. Dark-mantled sooty albatrosses P. fusca on Marion Island have decreased by almost 2% per year since 1996, continuing a negative trend from the early 1980s, whereas light-mantled sooty albatrosses P. palpebrata have increased by almost 6% per year at Marion Island since 1996. Counts of both giant petrels increased at Prince Edward Island (northern Macronectes halli by 44%; southern M. giganteus by 28%), whereas their numbers have remained stable at Marion Island. Current best estimates for annual breeding populations (pairs) at the two islands are 3 650 wandering albatrosses, 9 500 grey-headed albatrosses, 7 000 Indian yellow-nosed albatrosses, 2 900 dark-mantled sooty albatrosses, 800 lightmantled sooty albatrosses, 750 northern giant petrels and 2 800 southern giant petrels, confirming the global importance of the Prince Edward Islands for these seven species. Apart from the dark-mantled sooty albatross, their populations are reasonably healthy despite fishing mortality.Keywords: Diomedea; Macronectes; Marion Island; population size; population trends; Phoebetria; Prince Edward Island; ThalassarcheAfrican Journal of Marine Science 2009, 31(3): 409–417 |
format |
Article in Journal/Newspaper |
author |
Ryan, PG Jones, MGW Dyer, BM Upfold, L Crawford, RJM |
spellingShingle |
Ryan, PG Jones, MGW Dyer, BM Upfold, L Crawford, RJM Recent population estimates and trends in numbers of albatrosses and giant petrels breeding at the sub-Antarctic Prince Edward Islands |
author_facet |
Ryan, PG Jones, MGW Dyer, BM Upfold, L Crawford, RJM |
author_sort |
Ryan, PG |
title |
Recent population estimates and trends in numbers of albatrosses and giant petrels breeding at the sub-Antarctic Prince Edward Islands |
title_short |
Recent population estimates and trends in numbers of albatrosses and giant petrels breeding at the sub-Antarctic Prince Edward Islands |
title_full |
Recent population estimates and trends in numbers of albatrosses and giant petrels breeding at the sub-Antarctic Prince Edward Islands |
title_fullStr |
Recent population estimates and trends in numbers of albatrosses and giant petrels breeding at the sub-Antarctic Prince Edward Islands |
title_full_unstemmed |
Recent population estimates and trends in numbers of albatrosses and giant petrels breeding at the sub-Antarctic Prince Edward Islands |
title_sort |
recent population estimates and trends in numbers of albatrosses and giant petrels breeding at the sub-antarctic prince edward islands |
publisher |
NISC |
publishDate |
2009 |
url |
http://www.ajol.info/index.php/ajms/article/view/49217 |
long_lat |
ENVELOPE(62.500,62.500,-67.567,-67.567) |
geographic |
Antarctic Indian Giganteus |
geographic_facet |
Antarctic Indian Giganteus |
genre |
Antarc* Antarctic Diomedea exulans Giant Petrels Marion Island Prince Edward Islands Prince Edward Island |
genre_facet |
Antarc* Antarctic Diomedea exulans Giant Petrels Marion Island Prince Edward Islands Prince Edward Island |
op_source |
African Journal of Marine Science; Vol 31, No 3 (2009) 1814-232X |
op_relation |
http://www.ajol.info/index.php/ajms/article/view/49217/35558 http://www.ajol.info/index.php/ajms/article/view/49217 |
op_rights |
Copyright for articles published in this journal is retained by the publisher. |
_version_ |
1766088777470574592 |