Demography and Population Trends of the Atlantic Yellow-Nosed Albatross
Abstract The Atlantic Yellow-nosed Albatross (Thalassarche chlororhynchos) breeds only at the Tristan da Cunha archipelago and Gough Island in the central South Atlantic Ocean, and is threatened by mortality from longline fisheries operating in the South Atlantic. Demographic data have been collecte...
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Online Access: | http://dx.doi.org/10.1093/condor/105.3.439 http://academic.oup.com/condor/article-pdf/105/3/439/29712496/condor0439.pdf |
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croxfordunivpr:10.1093/condor/105.3.439 2024-04-07T07:55:53+00:00 Demography and Population Trends of the Atlantic Yellow-Nosed Albatross Cuthbert, Richard Ryan, Peter G. Cooper, John Hilton, Geoff 2003 http://dx.doi.org/10.1093/condor/105.3.439 http://academic.oup.com/condor/article-pdf/105/3/439/29712496/condor0439.pdf en eng Oxford University Press (OUP) The Condor volume 105, issue 3, page 439-452 ISSN 0010-5422 1938-5129 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2003 croxfordunivpr https://doi.org/10.1093/condor/105.3.439 2024-03-08T03:04:44Z Abstract The Atlantic Yellow-nosed Albatross (Thalassarche chlororhynchos) breeds only at the Tristan da Cunha archipelago and Gough Island in the central South Atlantic Ocean, and is threatened by mortality from longline fisheries operating in the South Atlantic. Demographic data have been collected from two study colonies on Gough Island and Tristan da Cunha for 20 years. Annual variation in the number of breeding birds was strongly correlated between the two islands, and over the whole study period both study populations have trended downward at around 1.2% per year. The number of established breeders on Gough Island has declined more rapidly, and significantly, at an annual rate of 2.3%. Monitoring established breeders may be a sensitive means of detecting population trends. Average breeding success (67–69%) and breeding frequency (66–65%) were very similar on the two islands. On Gough Island immature and adult annual apparent survival averaged 88 ± 3% and 92 ± 1%, respectively, and apparent survival from fledging to age 5 has averaged 31 ± 8%. Apparent adult survival on Tristan da Cunha averaged only 84 ± 2%. Annual survival of Tristan birds was negatively correlated with longline fishing effort in the South Atlantic Ocean. Population modeling predicts annual rates of decrease of 1.5–2.8% on Gough Island and 5.5% on Tristan da Cunha. Comparison with congeners suggests that the observed and predicted decreases are most likely to be caused by low adult and immature survival. The conservation status of Atlantic Yellow-nosed Albatrosses should be changed from Near Threatened to Endangered. Demografía y Tendencias Poblacionales del Albatros Thalassarche chlororhynchos Resumen. El albatros Thalassarche chlororhynchos sólo se reproduce en el archipiélago Tristan da Cunha y en la isla Gough en el Océano Atlántico Sur central, y se encuentra amenazado debido a la mortalidad causada por las pesqueras de espinel que operan en el Atlántico Sur. Se colectaron datos demográficos durante 20 años en dos colonias ... Article in Journal/Newspaper South Atlantic Ocean Oxford University Press Tristan ENVELOPE(140.900,140.900,-66.735,-66.735) Gough ENVELOPE(159.367,159.367,-81.633,-81.633) The Condor 105 3 439 452 |
institution |
Open Polar |
collection |
Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Cuthbert, Richard Ryan, Peter G. Cooper, John Hilton, Geoff Demography and Population Trends of the Atlantic Yellow-Nosed Albatross |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Abstract The Atlantic Yellow-nosed Albatross (Thalassarche chlororhynchos) breeds only at the Tristan da Cunha archipelago and Gough Island in the central South Atlantic Ocean, and is threatened by mortality from longline fisheries operating in the South Atlantic. Demographic data have been collected from two study colonies on Gough Island and Tristan da Cunha for 20 years. Annual variation in the number of breeding birds was strongly correlated between the two islands, and over the whole study period both study populations have trended downward at around 1.2% per year. The number of established breeders on Gough Island has declined more rapidly, and significantly, at an annual rate of 2.3%. Monitoring established breeders may be a sensitive means of detecting population trends. Average breeding success (67–69%) and breeding frequency (66–65%) were very similar on the two islands. On Gough Island immature and adult annual apparent survival averaged 88 ± 3% and 92 ± 1%, respectively, and apparent survival from fledging to age 5 has averaged 31 ± 8%. Apparent adult survival on Tristan da Cunha averaged only 84 ± 2%. Annual survival of Tristan birds was negatively correlated with longline fishing effort in the South Atlantic Ocean. Population modeling predicts annual rates of decrease of 1.5–2.8% on Gough Island and 5.5% on Tristan da Cunha. Comparison with congeners suggests that the observed and predicted decreases are most likely to be caused by low adult and immature survival. The conservation status of Atlantic Yellow-nosed Albatrosses should be changed from Near Threatened to Endangered. Demografía y Tendencias Poblacionales del Albatros Thalassarche chlororhynchos Resumen. El albatros Thalassarche chlororhynchos sólo se reproduce en el archipiélago Tristan da Cunha y en la isla Gough en el Océano Atlántico Sur central, y se encuentra amenazado debido a la mortalidad causada por las pesqueras de espinel que operan en el Atlántico Sur. Se colectaron datos demográficos durante 20 años en dos colonias ... |
format |
Article in Journal/Newspaper |
author |
Cuthbert, Richard Ryan, Peter G. Cooper, John Hilton, Geoff |
author_facet |
Cuthbert, Richard Ryan, Peter G. Cooper, John Hilton, Geoff |
author_sort |
Cuthbert, Richard |
title |
Demography and Population Trends of the Atlantic Yellow-Nosed Albatross |
title_short |
Demography and Population Trends of the Atlantic Yellow-Nosed Albatross |
title_full |
Demography and Population Trends of the Atlantic Yellow-Nosed Albatross |
title_fullStr |
Demography and Population Trends of the Atlantic Yellow-Nosed Albatross |
title_full_unstemmed |
Demography and Population Trends of the Atlantic Yellow-Nosed Albatross |
title_sort |
demography and population trends of the atlantic yellow-nosed albatross |
publisher |
Oxford University Press (OUP) |
publishDate |
2003 |
url |
http://dx.doi.org/10.1093/condor/105.3.439 http://academic.oup.com/condor/article-pdf/105/3/439/29712496/condor0439.pdf |
long_lat |
ENVELOPE(140.900,140.900,-66.735,-66.735) ENVELOPE(159.367,159.367,-81.633,-81.633) |
geographic |
Tristan Gough |
geographic_facet |
Tristan Gough |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
The Condor volume 105, issue 3, page 439-452 ISSN 0010-5422 1938-5129 |
op_doi |
https://doi.org/10.1093/condor/105.3.439 |
container_title |
The Condor |
container_volume |
105 |
container_issue |
3 |
container_start_page |
439 |
op_container_end_page |
452 |
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1795673450598105088 |