Chinstrap and macaroni penguin diet and demography at Nyrøysa, Bouvetøya
Abstract Knowledge regarding interactions between predators and their prey is fundamental for understanding underlying links between climate change and ecosystem responses, including predator demographics, in the Southern Ocean. This study reports data on reproductive performance, total population s...
Published in: | Antarctic Science |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
2015
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s0954102015000504 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102015000504 |
id |
crcambridgeupr:10.1017/s0954102015000504 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/s0954102015000504 2024-03-03T08:36:55+00:00 Chinstrap and macaroni penguin diet and demography at Nyrøysa, Bouvetøya Niemandt, Corne Kovacs, Kit M. Lydersen, Christian Dyer, Bruce M. Isaksen, Kjell Hofmeyr, G.J. Greg Mehlum, Fridtjof de Bruyn, P.J. Nico 2015 http://dx.doi.org/10.1017/s0954102015000504 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102015000504 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 28, issue 2, page 91-100 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2015 crcambridgeupr https://doi.org/10.1017/s0954102015000504 2024-02-08T08:40:40Z Abstract Knowledge regarding interactions between predators and their prey is fundamental for understanding underlying links between climate change and ecosystem responses, including predator demographics, in the Southern Ocean. This study reports data on reproductive performance, total population size and diet composition for macaroni and chinstrap penguins breeding at Nyrøysa on Bouvetøya during the summers of 1996–97, 1998–99, 2000–01 and 2007–08. The breeding populations of these two species at Nyrøysa decreased significantly over the study period, with an 80% decline for chinstraps and a 50% decline for macaroni penguins, despite relatively high levels of chick production. During this period macaroni penguins at this site ate a diverse diet, dominated by myctophid fish and two krill species, whereas chinstrap penguins were Antarctic krill specialists. The population changes are probably primarily due to the expanding Antarctic fur seal population, and also to landslides that are the result of increased melting on the island which have destroyed penguin breeding sites. Additional impacts from global warming of the ocean might also be playing a role and could exacerbate the decline in these penguin populations if krill and other prey are negatively impacted in the future in this region. The local chinstrap penguin population would probably be most heavily affected given its narrow feeding niche and small current population size. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seal Antarctic Krill Antarctic Science Bouvetøya Chinstrap penguin Macaroni penguin Southern Ocean Cambridge University Press Antarctic Southern Ocean Bouvetøya ENVELOPE(3.358,3.358,-54.422,-54.422) Nyrøysa ENVELOPE(3.286,3.286,-54.410,-54.410) Antarctic Science 28 2 91 100 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Niemandt, Corne Kovacs, Kit M. Lydersen, Christian Dyer, Bruce M. Isaksen, Kjell Hofmeyr, G.J. Greg Mehlum, Fridtjof de Bruyn, P.J. Nico Chinstrap and macaroni penguin diet and demography at Nyrøysa, Bouvetøya |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Knowledge regarding interactions between predators and their prey is fundamental for understanding underlying links between climate change and ecosystem responses, including predator demographics, in the Southern Ocean. This study reports data on reproductive performance, total population size and diet composition for macaroni and chinstrap penguins breeding at Nyrøysa on Bouvetøya during the summers of 1996–97, 1998–99, 2000–01 and 2007–08. The breeding populations of these two species at Nyrøysa decreased significantly over the study period, with an 80% decline for chinstraps and a 50% decline for macaroni penguins, despite relatively high levels of chick production. During this period macaroni penguins at this site ate a diverse diet, dominated by myctophid fish and two krill species, whereas chinstrap penguins were Antarctic krill specialists. The population changes are probably primarily due to the expanding Antarctic fur seal population, and also to landslides that are the result of increased melting on the island which have destroyed penguin breeding sites. Additional impacts from global warming of the ocean might also be playing a role and could exacerbate the decline in these penguin populations if krill and other prey are negatively impacted in the future in this region. The local chinstrap penguin population would probably be most heavily affected given its narrow feeding niche and small current population size. |
format |
Article in Journal/Newspaper |
author |
Niemandt, Corne Kovacs, Kit M. Lydersen, Christian Dyer, Bruce M. Isaksen, Kjell Hofmeyr, G.J. Greg Mehlum, Fridtjof de Bruyn, P.J. Nico |
author_facet |
Niemandt, Corne Kovacs, Kit M. Lydersen, Christian Dyer, Bruce M. Isaksen, Kjell Hofmeyr, G.J. Greg Mehlum, Fridtjof de Bruyn, P.J. Nico |
author_sort |
Niemandt, Corne |
title |
Chinstrap and macaroni penguin diet and demography at Nyrøysa, Bouvetøya |
title_short |
Chinstrap and macaroni penguin diet and demography at Nyrøysa, Bouvetøya |
title_full |
Chinstrap and macaroni penguin diet and demography at Nyrøysa, Bouvetøya |
title_fullStr |
Chinstrap and macaroni penguin diet and demography at Nyrøysa, Bouvetøya |
title_full_unstemmed |
Chinstrap and macaroni penguin diet and demography at Nyrøysa, Bouvetøya |
title_sort |
chinstrap and macaroni penguin diet and demography at nyrøysa, bouvetøya |
publisher |
Cambridge University Press (CUP) |
publishDate |
2015 |
url |
http://dx.doi.org/10.1017/s0954102015000504 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102015000504 |
long_lat |
ENVELOPE(3.358,3.358,-54.422,-54.422) ENVELOPE(3.286,3.286,-54.410,-54.410) |
geographic |
Antarctic Southern Ocean Bouvetøya Nyrøysa |
geographic_facet |
Antarctic Southern Ocean Bouvetøya Nyrøysa |
genre |
Antarc* Antarctic Antarctic Fur Seal Antarctic Krill Antarctic Science Bouvetøya Chinstrap penguin Macaroni penguin Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Fur Seal Antarctic Krill Antarctic Science Bouvetøya Chinstrap penguin Macaroni penguin Southern Ocean |
op_source |
Antarctic Science volume 28, issue 2, page 91-100 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102015000504 |
container_title |
Antarctic Science |
container_volume |
28 |
container_issue |
2 |
container_start_page |
91 |
op_container_end_page |
100 |
_version_ |
1792496413014228992 |