Feeding behaviour of free-ranging penguins determined by oesophageal temperature.
Sea birds play a major role in marine food webs, and it is important to determine when and how much they feed at sea. A major advance has been made by using the drop in stomach temperature after ingestion of ectothermic prey. This method is less sensitive when birds eat small prey or when the stomac...
Published in: | Proceedings of the Royal Society of London. Series B: Biological Sciences |
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Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1088584 http://www.ncbi.nlm.nih.gov/pubmed/11209884 https://doi.org/10.1098/rspb.2000.1343 |
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ftpubmed:oai:pubmedcentral.nih.gov:1088584 2023-05-15T17:03:56+02:00 Feeding behaviour of free-ranging penguins determined by oesophageal temperature. Charrassin, J B Kato, A Handrich, Y Sato, K Naito, Y Ancel, A Bost, C A Gauthier-Clerc, M Ropert-Coudert, Y Le Maho, Y 2001-01-22 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1088584 http://www.ncbi.nlm.nih.gov/pubmed/11209884 https://doi.org/10.1098/rspb.2000.1343 en eng http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1088584 http://www.ncbi.nlm.nih.gov/pubmed/11209884 http://dx.doi.org/10.1098/rspb.2000.1343 Article Text 2001 ftpubmed https://doi.org/10.1098/rspb.2000.1343 2013-08-30T08:43:40Z Sea birds play a major role in marine food webs, and it is important to determine when and how much they feed at sea. A major advance has been made by using the drop in stomach temperature after ingestion of ectothermic prey. This method is less sensitive when birds eat small prey or when the stomach is full. Moreover, in diving birds, independently of food ingestion, there are fluctuations in the lower abdominal temperature during the dives. Using oesophageal temperature, we present here a new method for detecting the timing of prey ingestion in free-ranging sea birds, and, to our knowledge, report the first data obtained on king penguins (Aptenodytes patagonicus). In birds ashore, which were hand-fed 2-15 g pieces of fish, all meal ingestions were detected with a sensor in the upper oesophagus. Detection was poorer with sensors at increasing distances from the beak. At sea, slow temperature drops in the upper oesophagus and stomach characterized a diving effect per se. For the upper oesophagus only, abrupt temperature variations were superimposed, therefore indicating prey ingestions. We determined the depths at which these occurred. Combining the changes in oesophageal temperatures of marine predators with their diving pattern opens new perspectives for understanding their foraging strategy, and, after validation with concurrent applications of classical techniques of prey survey, for assessing the distribution of their prey. Text King Penguins PubMed Central (PMC) The Beak ENVELOPE(-130.771,-130.771,56.466,56.466) Proceedings of the Royal Society of London. Series B: Biological Sciences 268 1463 151 157 |
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Article Charrassin, J B Kato, A Handrich, Y Sato, K Naito, Y Ancel, A Bost, C A Gauthier-Clerc, M Ropert-Coudert, Y Le Maho, Y Feeding behaviour of free-ranging penguins determined by oesophageal temperature. |
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Article |
description |
Sea birds play a major role in marine food webs, and it is important to determine when and how much they feed at sea. A major advance has been made by using the drop in stomach temperature after ingestion of ectothermic prey. This method is less sensitive when birds eat small prey or when the stomach is full. Moreover, in diving birds, independently of food ingestion, there are fluctuations in the lower abdominal temperature during the dives. Using oesophageal temperature, we present here a new method for detecting the timing of prey ingestion in free-ranging sea birds, and, to our knowledge, report the first data obtained on king penguins (Aptenodytes patagonicus). In birds ashore, which were hand-fed 2-15 g pieces of fish, all meal ingestions were detected with a sensor in the upper oesophagus. Detection was poorer with sensors at increasing distances from the beak. At sea, slow temperature drops in the upper oesophagus and stomach characterized a diving effect per se. For the upper oesophagus only, abrupt temperature variations were superimposed, therefore indicating prey ingestions. We determined the depths at which these occurred. Combining the changes in oesophageal temperatures of marine predators with their diving pattern opens new perspectives for understanding their foraging strategy, and, after validation with concurrent applications of classical techniques of prey survey, for assessing the distribution of their prey. |
format |
Text |
author |
Charrassin, J B Kato, A Handrich, Y Sato, K Naito, Y Ancel, A Bost, C A Gauthier-Clerc, M Ropert-Coudert, Y Le Maho, Y |
author_facet |
Charrassin, J B Kato, A Handrich, Y Sato, K Naito, Y Ancel, A Bost, C A Gauthier-Clerc, M Ropert-Coudert, Y Le Maho, Y |
author_sort |
Charrassin, J B |
title |
Feeding behaviour of free-ranging penguins determined by oesophageal temperature. |
title_short |
Feeding behaviour of free-ranging penguins determined by oesophageal temperature. |
title_full |
Feeding behaviour of free-ranging penguins determined by oesophageal temperature. |
title_fullStr |
Feeding behaviour of free-ranging penguins determined by oesophageal temperature. |
title_full_unstemmed |
Feeding behaviour of free-ranging penguins determined by oesophageal temperature. |
title_sort |
feeding behaviour of free-ranging penguins determined by oesophageal temperature. |
publishDate |
2001 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1088584 http://www.ncbi.nlm.nih.gov/pubmed/11209884 https://doi.org/10.1098/rspb.2000.1343 |
long_lat |
ENVELOPE(-130.771,-130.771,56.466,56.466) |
geographic |
The Beak |
geographic_facet |
The Beak |
genre |
King Penguins |
genre_facet |
King Penguins |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1088584 http://www.ncbi.nlm.nih.gov/pubmed/11209884 http://dx.doi.org/10.1098/rspb.2000.1343 |
op_doi |
https://doi.org/10.1098/rspb.2000.1343 |
container_title |
Proceedings of the Royal Society of London. Series B: Biological Sciences |
container_volume |
268 |
container_issue |
1463 |
container_start_page |
151 |
op_container_end_page |
157 |
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1766057929109143552 |