Energy and protein requirements for molt in the king penguin Aptenodytes patagonicus
International audience Adult king penguins annually fast ashore for 1 mo for molting. By the end of molt, they have lost 44% of their prefasting body mass. About 18% of new feather synthesis occurs at sea, thus reducing both nutrient requirement and fasting duration. Plumage synthesis continues duri...
Published in: | American Journal of Physiology-Regulatory, Integrative and Comparative Physiology |
---|---|
Main Authors: | , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
1994
|
Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-03850229 https://doi.org/10.1152/ajpregu.1994.266.4.R1182 |
id |
ftunivnantes:oai:HAL:hal-03850229v1 |
---|---|
record_format |
openpolar |
spelling |
ftunivnantes:oai:HAL:hal-03850229v1 2023-05-15T17:03:55+02:00 Energy and protein requirements for molt in the king penguin Aptenodytes patagonicus Cherel, Yves Charrassin, Jean-Benoit Challet, Etienne Centre d'Ecologie et de Physiologie Energétiques Centre National de la Recherche Scientifique (CNRS) 1994-04-01 https://hal.archives-ouvertes.fr/hal-03850229 https://doi.org/10.1152/ajpregu.1994.266.4.R1182 en eng HAL CCSD American Physiological Society info:eu-repo/semantics/altIdentifier/doi/10.1152/ajpregu.1994.266.4.R1182 info:eu-repo/semantics/altIdentifier/pmid/8184961 hal-03850229 https://hal.archives-ouvertes.fr/hal-03850229 doi:10.1152/ajpregu.1994.266.4.R1182 PUBMED: 8184961 WOS: A1994NJ99600066 ISSN: 0363-6119 EISSN: 1522-1490 AJP - Regulatory, Integrative and Comparative Physiology https://hal.archives-ouvertes.fr/hal-03850229 AJP - Regulatory, Integrative and Comparative Physiology, American Physiological Society, 1994, 266 (4), pp.R1182-R1188. ⟨10.1152/ajpregu.1994.266.4.R1182⟩ [SDV.BA]Life Sciences [q-bio]/Animal biology info:eu-repo/semantics/article Journal articles 1994 ftunivnantes https://doi.org/10.1152/ajpregu.1994.266.4.R1182 2022-11-23T00:19:24Z International audience Adult king penguins annually fast ashore for 1 mo for molting. By the end of molt, they have lost 44% of their prefasting body mass. About 18% of new feather synthesis occurs at sea, thus reducing both nutrient requirement and fasting duration. Plumage synthesis continues during the first 3 wk of fasting. Loss of old feathers occurs between day 12 and day 21 of the molt, and it is associated with a peak in daily body mass loss. The dry mass of epidermal structure synthesized during molt is 395 g. Body composition analysis indicates that fat oxidation accounts for 85% of total energy expenditure. The proportion for protein is 15%, a value twofold higher than during the breeding (nonmolting) fast. The mean energy expenditure is also 21% higher during the molting fast (3.04 W/kg). Compared with other birds, the energetic cost of feather synthesis is the lowest in king penguins (85 kJ/g) and consequently the energetic efficiency is the highest (25%). Changes in tissue composition during molt show that integument is the main lipid source (72% of the lipid loss) and thus the main source of energy (61% of the total energy expenditure). The integument and the pectoral muscles play a major role in molting protein metabolism, providing 20 and 57%, respectively, of the total protein needs for feather synthesis and/or energy expenditure. This result emphasizes the role of integument as a protein source, because the large premolting muscle hypertrophy is not sufficient to account for the totality of the protein cost of molt. Article in Journal/Newspaper King Penguins Université de Nantes: HAL-UNIV-NANTES American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 266 4 R1182 R1188 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDV.BA]Life Sciences [q-bio]/Animal biology |
spellingShingle |
[SDV.BA]Life Sciences [q-bio]/Animal biology Cherel, Yves Charrassin, Jean-Benoit Challet, Etienne Energy and protein requirements for molt in the king penguin Aptenodytes patagonicus |
topic_facet |
[SDV.BA]Life Sciences [q-bio]/Animal biology |
description |
International audience Adult king penguins annually fast ashore for 1 mo for molting. By the end of molt, they have lost 44% of their prefasting body mass. About 18% of new feather synthesis occurs at sea, thus reducing both nutrient requirement and fasting duration. Plumage synthesis continues during the first 3 wk of fasting. Loss of old feathers occurs between day 12 and day 21 of the molt, and it is associated with a peak in daily body mass loss. The dry mass of epidermal structure synthesized during molt is 395 g. Body composition analysis indicates that fat oxidation accounts for 85% of total energy expenditure. The proportion for protein is 15%, a value twofold higher than during the breeding (nonmolting) fast. The mean energy expenditure is also 21% higher during the molting fast (3.04 W/kg). Compared with other birds, the energetic cost of feather synthesis is the lowest in king penguins (85 kJ/g) and consequently the energetic efficiency is the highest (25%). Changes in tissue composition during molt show that integument is the main lipid source (72% of the lipid loss) and thus the main source of energy (61% of the total energy expenditure). The integument and the pectoral muscles play a major role in molting protein metabolism, providing 20 and 57%, respectively, of the total protein needs for feather synthesis and/or energy expenditure. This result emphasizes the role of integument as a protein source, because the large premolting muscle hypertrophy is not sufficient to account for the totality of the protein cost of molt. |
author2 |
Centre d'Ecologie et de Physiologie Energétiques Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Cherel, Yves Charrassin, Jean-Benoit Challet, Etienne |
author_facet |
Cherel, Yves Charrassin, Jean-Benoit Challet, Etienne |
author_sort |
Cherel, Yves |
title |
Energy and protein requirements for molt in the king penguin Aptenodytes patagonicus |
title_short |
Energy and protein requirements for molt in the king penguin Aptenodytes patagonicus |
title_full |
Energy and protein requirements for molt in the king penguin Aptenodytes patagonicus |
title_fullStr |
Energy and protein requirements for molt in the king penguin Aptenodytes patagonicus |
title_full_unstemmed |
Energy and protein requirements for molt in the king penguin Aptenodytes patagonicus |
title_sort |
energy and protein requirements for molt in the king penguin aptenodytes patagonicus |
publisher |
HAL CCSD |
publishDate |
1994 |
url |
https://hal.archives-ouvertes.fr/hal-03850229 https://doi.org/10.1152/ajpregu.1994.266.4.R1182 |
genre |
King Penguins |
genre_facet |
King Penguins |
op_source |
ISSN: 0363-6119 EISSN: 1522-1490 AJP - Regulatory, Integrative and Comparative Physiology https://hal.archives-ouvertes.fr/hal-03850229 AJP - Regulatory, Integrative and Comparative Physiology, American Physiological Society, 1994, 266 (4), pp.R1182-R1188. ⟨10.1152/ajpregu.1994.266.4.R1182⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1152/ajpregu.1994.266.4.R1182 info:eu-repo/semantics/altIdentifier/pmid/8184961 hal-03850229 https://hal.archives-ouvertes.fr/hal-03850229 doi:10.1152/ajpregu.1994.266.4.R1182 PUBMED: 8184961 WOS: A1994NJ99600066 |
op_doi |
https://doi.org/10.1152/ajpregu.1994.266.4.R1182 |
container_title |
American Journal of Physiology-Regulatory, Integrative and Comparative Physiology |
container_volume |
266 |
container_issue |
4 |
container_start_page |
R1182 |
op_container_end_page |
R1188 |
_version_ |
1766057897738895360 |