Mass change in Antarctic fur seal (Arctocephalus gazella) pups in relation to maternal characteristics at the Kerguelen Islands
International audience Abstract: Maternal allocation to growth of the pup was measured in Antarctic fur seals (Arctocephalus gazella) at the Kerguèlen Islands during the 1997 austral summer. Absolute mass gain of pups following a maternal foraging trip was independent of the sex of the pup but was p...
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ftunivnantes:oai:HAL:hal-00193466v1 2023-05-15T13:37:48+02:00 Mass change in Antarctic fur seal (Arctocephalus gazella) pups in relation to maternal characteristics at the Kerguelen Islands Guinet, Christophe Lea, Marie-Anne Goldsworthy, Simon D. Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) Antartic Wildlife Research Unit School of Zoology, University of Tasmania 2000 https://hal.science/hal-00193466 en eng HAL CCSD NRC Research Press hal-00193466 https://hal.science/hal-00193466 ISSN: 0008-4301 EISSN: 1480-3283 Canadian Journal of Zoology https://hal.science/hal-00193466 Canadian Journal of Zoology, 2000, 78, pp.476-483 [SDE.BE]Environmental Sciences/Biodiversity and Ecology info:eu-repo/semantics/article Journal articles 2000 ftunivnantes 2023-02-08T08:12:23Z International audience Abstract: Maternal allocation to growth of the pup was measured in Antarctic fur seals (Arctocephalus gazella) at the Kerguèlen Islands during the 1997 austral summer. Absolute mass gain of pups following a maternal foraging trip was independent of the sex of the pup but was positively related to foraging-trip duration and maternal length. However, daily mass gain (i.e., absolute mass gain of the pup divided by foraging-trip duration) decreased with increasing foraging- trip duration but increased with maternal length. While the pup were fasting, their daily mass loss was related to their sex and initial body mass: both heavier pups and female pups lost more mass per day than lighter pups and male pups. The mass-specific rate of mass loss was significantly higher in female than in male pups. Over the study period, the mean growth rate was zero, with no difference between female and male pups. The growth rate in mass of the pup was positively related to maternal length but not to maternal condition, and negatively related to the foraging-trip duration of the mother and the initial mass of the pup. This indicates that during the study period, heavier pups grew more slowly because of their higher rate of daily mass loss during periods of fasting. Interestingly, for a given maternal length, the mean mass of the pup during the study period was higher for male than for female pups, even though the rate of daily mass gain was the same. Such differences are likely to result from sex differences in the mass-specific rate of mass loss. As female pups lose a greater proportion of their mass per day, a zero growth rate (i.e., mass gain only compensating for mass loss) is reached at a lower mass in female pups than in male pups. Our results indicate that maternal allocation does not differ according to the sex of the pup, but suggest that the two sexes follow different growth strategies. 483 Résumé : L'allocation des ressources de la mère à son petit a été étudié chez l'Otarie de Kerguelen ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Arctocephalus gazella Kerguelen Islands Université de Nantes: HAL-UNIV-NANTES Antarctic Austral Kerguelen Kerguelen Islands |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology |
spellingShingle |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology Guinet, Christophe Lea, Marie-Anne Goldsworthy, Simon D. Mass change in Antarctic fur seal (Arctocephalus gazella) pups in relation to maternal characteristics at the Kerguelen Islands |
topic_facet |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology |
description |
International audience Abstract: Maternal allocation to growth of the pup was measured in Antarctic fur seals (Arctocephalus gazella) at the Kerguèlen Islands during the 1997 austral summer. Absolute mass gain of pups following a maternal foraging trip was independent of the sex of the pup but was positively related to foraging-trip duration and maternal length. However, daily mass gain (i.e., absolute mass gain of the pup divided by foraging-trip duration) decreased with increasing foraging- trip duration but increased with maternal length. While the pup were fasting, their daily mass loss was related to their sex and initial body mass: both heavier pups and female pups lost more mass per day than lighter pups and male pups. The mass-specific rate of mass loss was significantly higher in female than in male pups. Over the study period, the mean growth rate was zero, with no difference between female and male pups. The growth rate in mass of the pup was positively related to maternal length but not to maternal condition, and negatively related to the foraging-trip duration of the mother and the initial mass of the pup. This indicates that during the study period, heavier pups grew more slowly because of their higher rate of daily mass loss during periods of fasting. Interestingly, for a given maternal length, the mean mass of the pup during the study period was higher for male than for female pups, even though the rate of daily mass gain was the same. Such differences are likely to result from sex differences in the mass-specific rate of mass loss. As female pups lose a greater proportion of their mass per day, a zero growth rate (i.e., mass gain only compensating for mass loss) is reached at a lower mass in female pups than in male pups. Our results indicate that maternal allocation does not differ according to the sex of the pup, but suggest that the two sexes follow different growth strategies. 483 Résumé : L'allocation des ressources de la mère à son petit a été étudié chez l'Otarie de Kerguelen ... |
author2 |
Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) Antartic Wildlife Research Unit School of Zoology, University of Tasmania |
format |
Article in Journal/Newspaper |
author |
Guinet, Christophe Lea, Marie-Anne Goldsworthy, Simon D. |
author_facet |
Guinet, Christophe Lea, Marie-Anne Goldsworthy, Simon D. |
author_sort |
Guinet, Christophe |
title |
Mass change in Antarctic fur seal (Arctocephalus gazella) pups in relation to maternal characteristics at the Kerguelen Islands |
title_short |
Mass change in Antarctic fur seal (Arctocephalus gazella) pups in relation to maternal characteristics at the Kerguelen Islands |
title_full |
Mass change in Antarctic fur seal (Arctocephalus gazella) pups in relation to maternal characteristics at the Kerguelen Islands |
title_fullStr |
Mass change in Antarctic fur seal (Arctocephalus gazella) pups in relation to maternal characteristics at the Kerguelen Islands |
title_full_unstemmed |
Mass change in Antarctic fur seal (Arctocephalus gazella) pups in relation to maternal characteristics at the Kerguelen Islands |
title_sort |
mass change in antarctic fur seal (arctocephalus gazella) pups in relation to maternal characteristics at the kerguelen islands |
publisher |
HAL CCSD |
publishDate |
2000 |
url |
https://hal.science/hal-00193466 |
geographic |
Antarctic Austral Kerguelen Kerguelen Islands |
geographic_facet |
Antarctic Austral Kerguelen Kerguelen Islands |
genre |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Arctocephalus gazella Kerguelen Islands |
genre_facet |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Arctocephalus gazella Kerguelen Islands |
op_source |
ISSN: 0008-4301 EISSN: 1480-3283 Canadian Journal of Zoology https://hal.science/hal-00193466 Canadian Journal of Zoology, 2000, 78, pp.476-483 |
op_relation |
hal-00193466 https://hal.science/hal-00193466 |
_version_ |
1766097805977321472 |