The food feeding ecology of the white‐chinned petrel Procellaria aequinctialis at South Georgia
The diet of the white‐chinned petrel at Bird Island, South Georgia was studied during chickrearing in 1986 by quantitative analysis (by weight, frequency of occurrence and number of individuals) of regurgitated or lavaged adult stomach contents. Antarctic krill comprised over 90% of prey items and f...
Published in: | Journal of Zoology |
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Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Wiley
1995
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Online Access: | http://dx.doi.org/10.1111/j.1469-7998.1995.tb02752.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1995.tb02752.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1995.tb02752.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1995.tb02752.x |
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crwiley:10.1111/j.1469-7998.1995.tb02752.x 2024-06-02T07:58:00+00:00 The food feeding ecology of the white‐chinned petrel Procellaria aequinctialis at South Georgia Croxall, J. P. Hall, A. J. Hill, H. J. North, A. W. Rodhouse, P. G. 1995 http://dx.doi.org/10.1111/j.1469-7998.1995.tb02752.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1995.tb02752.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1995.tb02752.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1995.tb02752.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Zoology volume 237, issue 1, page 133-150 ISSN 0952-8369 1469-7998 journal-article 1995 crwiley https://doi.org/10.1111/j.1469-7998.1995.tb02752.x 2024-05-03T11:30:43Z The diet of the white‐chinned petrel at Bird Island, South Georgia was studied during chickrearing in 1986 by quantitative analysis (by weight, frequency of occurrence and number of individuals) of regurgitated or lavaged adult stomach contents. Antarctic krill comprised over 90% of prey items and formed 47% of the diet by weight; fish and squid occurred in 67% and 35% of samples and formed 33% and 19% of the diet by weight, respectively. Decapods, amphipods and salps occurred in a few samples. The fish were mainly lanternfish (Myctophidae) of eight species (chiefly Electrona and Gymnoscopelus , forming 80% by number and 52% by mass of fish prey) and the nototheniid Patagonotothen guntheri (14% by number and 35% by mass). Of squid taken, the ommastrephid Martialia hyadesi comprised 57% by number and 52% by mass and the gonatid Gonatus antarcticus 14% by number and 42% by mass. These dietary data confirm white‐chinned petrel as the most important avian consumer of fish and squid at South Georgia (and the third most important consumer of krill). In 1986 the nototheniid fish were probably obtained via commercial fishing operations but the myctophids and squid were probably live‐caught, most likely at night. Meal size increased rapidly until chicks were three weeks old and then remained constant until the chicks were within 10 days of fledging, when it decreased. Meal delivery rate was high (one per day) for young chicks (1–10 days old) and thereafter fluctuated between 0.56 and 0.88 meals per day until close to fledging, when it was halved. These provisioning rates, and the proportion of krill in the diet, are higher than those recorded previously at South Georgia and Indian Ocean sites, probably reflecting high local availability of krill at South Georgia in 1986. In many respects, white‐chinned petrels at South Georgia are intermediate ecologically between prions and albatrosses, although specialized in their extensive consumption of myctophids. Because krill and all the main fish prey are currently the targets ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill antarcticus Bird Island Wiley Online Library Antarctic Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) Indian Journal of Zoology 237 1 133 150 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
The diet of the white‐chinned petrel at Bird Island, South Georgia was studied during chickrearing in 1986 by quantitative analysis (by weight, frequency of occurrence and number of individuals) of regurgitated or lavaged adult stomach contents. Antarctic krill comprised over 90% of prey items and formed 47% of the diet by weight; fish and squid occurred in 67% and 35% of samples and formed 33% and 19% of the diet by weight, respectively. Decapods, amphipods and salps occurred in a few samples. The fish were mainly lanternfish (Myctophidae) of eight species (chiefly Electrona and Gymnoscopelus , forming 80% by number and 52% by mass of fish prey) and the nototheniid Patagonotothen guntheri (14% by number and 35% by mass). Of squid taken, the ommastrephid Martialia hyadesi comprised 57% by number and 52% by mass and the gonatid Gonatus antarcticus 14% by number and 42% by mass. These dietary data confirm white‐chinned petrel as the most important avian consumer of fish and squid at South Georgia (and the third most important consumer of krill). In 1986 the nototheniid fish were probably obtained via commercial fishing operations but the myctophids and squid were probably live‐caught, most likely at night. Meal size increased rapidly until chicks were three weeks old and then remained constant until the chicks were within 10 days of fledging, when it decreased. Meal delivery rate was high (one per day) for young chicks (1–10 days old) and thereafter fluctuated between 0.56 and 0.88 meals per day until close to fledging, when it was halved. These provisioning rates, and the proportion of krill in the diet, are higher than those recorded previously at South Georgia and Indian Ocean sites, probably reflecting high local availability of krill at South Georgia in 1986. In many respects, white‐chinned petrels at South Georgia are intermediate ecologically between prions and albatrosses, although specialized in their extensive consumption of myctophids. Because krill and all the main fish prey are currently the targets ... |
format |
Article in Journal/Newspaper |
author |
Croxall, J. P. Hall, A. J. Hill, H. J. North, A. W. Rodhouse, P. G. |
spellingShingle |
Croxall, J. P. Hall, A. J. Hill, H. J. North, A. W. Rodhouse, P. G. The food feeding ecology of the white‐chinned petrel Procellaria aequinctialis at South Georgia |
author_facet |
Croxall, J. P. Hall, A. J. Hill, H. J. North, A. W. Rodhouse, P. G. |
author_sort |
Croxall, J. P. |
title |
The food feeding ecology of the white‐chinned petrel Procellaria aequinctialis at South Georgia |
title_short |
The food feeding ecology of the white‐chinned petrel Procellaria aequinctialis at South Georgia |
title_full |
The food feeding ecology of the white‐chinned petrel Procellaria aequinctialis at South Georgia |
title_fullStr |
The food feeding ecology of the white‐chinned petrel Procellaria aequinctialis at South Georgia |
title_full_unstemmed |
The food feeding ecology of the white‐chinned petrel Procellaria aequinctialis at South Georgia |
title_sort |
food feeding ecology of the white‐chinned petrel procellaria aequinctialis at south georgia |
publisher |
Wiley |
publishDate |
1995 |
url |
http://dx.doi.org/10.1111/j.1469-7998.1995.tb02752.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1995.tb02752.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1995.tb02752.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1995.tb02752.x |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
geographic |
Antarctic Bird Island Indian |
geographic_facet |
Antarctic Bird Island Indian |
genre |
Antarc* Antarctic Antarctic Krill antarcticus Bird Island |
genre_facet |
Antarc* Antarctic Antarctic Krill antarcticus Bird Island |
op_source |
Journal of Zoology volume 237, issue 1, page 133-150 ISSN 0952-8369 1469-7998 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1469-7998.1995.tb02752.x |
container_title |
Journal of Zoology |
container_volume |
237 |
container_issue |
1 |
container_start_page |
133 |
op_container_end_page |
150 |
_version_ |
1800741252759552000 |