Development of homeothermy in chicks of sub-Antarctic burrowing petrels
The development of homeothermy was studied in chicks of five species of sub-Antarctic burrowing petrels. Chicks of white-chinned and blue petrels were capable of maintaining body temperatures of 37° to 40°C at ambient temperatures between 5° and 30°C within one day of hatching. On average, chicks of...
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ftjafricanj:oai:ojs.ajol.info:article/153474 2023-05-15T13:51:04+02:00 Development of homeothermy in chicks of sub-Antarctic burrowing petrels Brown, C.R. Prys-Jones, R.P. 2017-03-20 application/pdf https://www.ajol.info/index.php/az/article/view/153474 eng eng NISC (Pty) Ltd https://www.ajol.info/index.php/az/article/view/153474/143066 https://www.ajol.info/index.php/az/article/view/153474 The copyright belongs to the Zoological Society of Southern Africa. African Zoology; Vol 23, No 4 (1988); 288-294 2224-073X 1562-7020 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2017 ftjafricanj 2017-03-26T01:01:46Z The development of homeothermy was studied in chicks of five species of sub-Antarctic burrowing petrels. Chicks of white-chinned and blue petrels were capable of maintaining body temperatures of 37° to 40°C at ambient temperatures between 5° and 30°C within one day of hatching. On average, chicks of grey petrels, great-winged petrels and Salvin’s prions attained homeothermy within five days of hatching, but some individuals exhibited well-developed homeothermy within 24 h of hatching. Chicks demonstrated a high capacity for heat production and maximum cold-induced oxygen consumptions ranged from 2,57 ml 02 g-1 h-1 in white-chinned petrel chicks to 4,94 ml 02 g-1 h-1 in the much smaller blue petrel chicks. The rapid development of homeothermy in burrowing petrel chicks is regarded as an adaptation in pelagic seabirds, in that it frees the adults both to replace energy reserves used during incubation and to forage for the chicks as soon as possible after hatching. In burrowing petrels it is reportedly facilitated by the chicks' thick down and a favourable burrow microclimate. This hypothesis was investigated by analysing cooling rates of dead chicks at wind speeds of 0,0 m s-1 and 7,5 m s-1, which simulated conditions within and outside burrows. Chicks exposed to windspeeds of 7,5 m s-1 lost heat at a rate 2,5 times greater than those not exposed to wind. However, this increase was substantially less than predicted for ‘model’ chicks and this difference is attributed to the efficiency of the chicks’ down. Article in Journal/Newspaper Antarc* Antarctic AJOL - African Journals Online Antarctic Burrows ENVELOPE(163.650,163.650,-74.300,-74.300) |
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Open Polar |
collection |
AJOL - African Journals Online |
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ftjafricanj |
language |
English |
description |
The development of homeothermy was studied in chicks of five species of sub-Antarctic burrowing petrels. Chicks of white-chinned and blue petrels were capable of maintaining body temperatures of 37° to 40°C at ambient temperatures between 5° and 30°C within one day of hatching. On average, chicks of grey petrels, great-winged petrels and Salvin’s prions attained homeothermy within five days of hatching, but some individuals exhibited well-developed homeothermy within 24 h of hatching. Chicks demonstrated a high capacity for heat production and maximum cold-induced oxygen consumptions ranged from 2,57 ml 02 g-1 h-1 in white-chinned petrel chicks to 4,94 ml 02 g-1 h-1 in the much smaller blue petrel chicks. The rapid development of homeothermy in burrowing petrel chicks is regarded as an adaptation in pelagic seabirds, in that it frees the adults both to replace energy reserves used during incubation and to forage for the chicks as soon as possible after hatching. In burrowing petrels it is reportedly facilitated by the chicks' thick down and a favourable burrow microclimate. This hypothesis was investigated by analysing cooling rates of dead chicks at wind speeds of 0,0 m s-1 and 7,5 m s-1, which simulated conditions within and outside burrows. Chicks exposed to windspeeds of 7,5 m s-1 lost heat at a rate 2,5 times greater than those not exposed to wind. However, this increase was substantially less than predicted for ‘model’ chicks and this difference is attributed to the efficiency of the chicks’ down. |
format |
Article in Journal/Newspaper |
author |
Brown, C.R. Prys-Jones, R.P. |
spellingShingle |
Brown, C.R. Prys-Jones, R.P. Development of homeothermy in chicks of sub-Antarctic burrowing petrels |
author_facet |
Brown, C.R. Prys-Jones, R.P. |
author_sort |
Brown, C.R. |
title |
Development of homeothermy in chicks of sub-Antarctic burrowing petrels |
title_short |
Development of homeothermy in chicks of sub-Antarctic burrowing petrels |
title_full |
Development of homeothermy in chicks of sub-Antarctic burrowing petrels |
title_fullStr |
Development of homeothermy in chicks of sub-Antarctic burrowing petrels |
title_full_unstemmed |
Development of homeothermy in chicks of sub-Antarctic burrowing petrels |
title_sort |
development of homeothermy in chicks of sub-antarctic burrowing petrels |
publisher |
NISC (Pty) Ltd |
publishDate |
2017 |
url |
https://www.ajol.info/index.php/az/article/view/153474 |
long_lat |
ENVELOPE(163.650,163.650,-74.300,-74.300) |
geographic |
Antarctic Burrows |
geographic_facet |
Antarctic Burrows |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
African Zoology; Vol 23, No 4 (1988); 288-294 2224-073X 1562-7020 |
op_relation |
https://www.ajol.info/index.php/az/article/view/153474/143066 https://www.ajol.info/index.php/az/article/view/153474 |
op_rights |
The copyright belongs to the Zoological Society of Southern Africa. |
_version_ |
1766254646099181568 |