The comparative energetics and growth strategies of sympatric Antarctic and sub Antarctic fur seal pups, at Iles Crozet
The period of maternal dependence is a time during which mammalian infants must optimise both their growth and the development of behavioural skills in order to successfully meet the demands of independent living. The rate and duration of maternal provisioning, post-weaning food availability and cli...
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Online Access: | https://scholarworks.sjsu.edu/biol_pub/24 https://doi.org/10.1242/jeb.00703 |
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ftsanjosestate:oai:scholarworks.sjsu.edu:biol_pub-1024 2023-07-30T03:58:58+02:00 The comparative energetics and growth strategies of sympatric Antarctic and sub Antarctic fur seal pups, at Iles Crozet Arnould, J PY Luque, S P Guinet, C Costa, D P Kingston, J Shaffer, Scott A 2003-01-01T08:00:00Z application/pdf https://scholarworks.sjsu.edu/biol_pub/24 https://doi.org/10.1242/jeb.00703 unknown SJSU ScholarWorks https://scholarworks.sjsu.edu/biol_pub/24 doi:10.1242/jeb.00703 http://dx.doi.org/10.1242/jeb.00703 http://creativecommons.org/licenses/by/3.0/ Faculty Publications, Biological Sciences Publications Biology Marine Biology text 2003 ftsanjosestate https://doi.org/10.1242/jeb.00703 2023-07-17T18:38:09Z The period of maternal dependence is a time during which mammalian infants must optimise both their growth and the development of behavioural skills in order to successfully meet the demands of independent living. The rate and duration of maternal provisioning, post-weaning food availability and climatic conditions are all factors likely to influence the growth strategies of infants. While numerous studies have documented differences in growth strategies at high taxonomic levels, few have investigated those of closely related species inhabiting similar environments. The present study examined the body composition, metabolism and indices of physiological development in pups of Antarctic fur seals (Arctocephalus gazella) and subantarctic fur seals (Arctocephalus tropicalis), congeneric species with different weaning ages (4 months and 10 months, respectively), during their overlap in lactation at a sympatric breeding site in the Iles Crozet. Body lipid reserves in pre-moult pups were significantly greater (t28=2.73, P<0.01) in subantarctic (26%) than Antarctic fur seals (22%). Antarctic fur seal pups, however, had significantly higher (t26=3.82, P<0.001) in-air resting metabolic rates (RMR; 17.1±0.6 ml O2 kg-1 min-1) than subantarctic fur seal pups (14.1±0.5 ml O2 kg-1 min-1). While in-water standard metabolic rate (SMR; 22.9±2.5 ml O2 kg-1 min-1) was greater than in-air RMR for Antarctic fur seal pups (t9=2.59, P<0.03), there were no significant differences between in-air RMR and in-water SMR for subantarctic fur seal pups (t12=0.82, P>0.4), although this is unlikely to reflect a greater ability for pre-moult pups of the latter species to thermoregulate in water. Pup daily energy expenditure was also significantly greater (t27=2.36, P<0.03) in Antarctic fur seals (638±33 kJ kg-1 day-1) than in subantarctic fur seals (533±33 kJ kg-1 day-1), which corroborates observations that pups of the former species spend considerably more time actively learning to swim and dive. Consistent with this observation ... Text Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Arctocephalus gazella San José State University: SJSU ScholarWorks Antarctic Journal of Experimental Biology 206 24 4497 4506 |
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topic |
Publications Biology Marine Biology |
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Publications Biology Marine Biology Arnould, J PY Luque, S P Guinet, C Costa, D P Kingston, J Shaffer, Scott A The comparative energetics and growth strategies of sympatric Antarctic and sub Antarctic fur seal pups, at Iles Crozet |
topic_facet |
Publications Biology Marine Biology |
description |
The period of maternal dependence is a time during which mammalian infants must optimise both their growth and the development of behavioural skills in order to successfully meet the demands of independent living. The rate and duration of maternal provisioning, post-weaning food availability and climatic conditions are all factors likely to influence the growth strategies of infants. While numerous studies have documented differences in growth strategies at high taxonomic levels, few have investigated those of closely related species inhabiting similar environments. The present study examined the body composition, metabolism and indices of physiological development in pups of Antarctic fur seals (Arctocephalus gazella) and subantarctic fur seals (Arctocephalus tropicalis), congeneric species with different weaning ages (4 months and 10 months, respectively), during their overlap in lactation at a sympatric breeding site in the Iles Crozet. Body lipid reserves in pre-moult pups were significantly greater (t28=2.73, P<0.01) in subantarctic (26%) than Antarctic fur seals (22%). Antarctic fur seal pups, however, had significantly higher (t26=3.82, P<0.001) in-air resting metabolic rates (RMR; 17.1±0.6 ml O2 kg-1 min-1) than subantarctic fur seal pups (14.1±0.5 ml O2 kg-1 min-1). While in-water standard metabolic rate (SMR; 22.9±2.5 ml O2 kg-1 min-1) was greater than in-air RMR for Antarctic fur seal pups (t9=2.59, P<0.03), there were no significant differences between in-air RMR and in-water SMR for subantarctic fur seal pups (t12=0.82, P>0.4), although this is unlikely to reflect a greater ability for pre-moult pups of the latter species to thermoregulate in water. Pup daily energy expenditure was also significantly greater (t27=2.36, P<0.03) in Antarctic fur seals (638±33 kJ kg-1 day-1) than in subantarctic fur seals (533±33 kJ kg-1 day-1), which corroborates observations that pups of the former species spend considerably more time actively learning to swim and dive. Consistent with this observation ... |
format |
Text |
author |
Arnould, J PY Luque, S P Guinet, C Costa, D P Kingston, J Shaffer, Scott A |
author_facet |
Arnould, J PY Luque, S P Guinet, C Costa, D P Kingston, J Shaffer, Scott A |
author_sort |
Arnould, J PY |
title |
The comparative energetics and growth strategies of sympatric Antarctic and sub Antarctic fur seal pups, at Iles Crozet |
title_short |
The comparative energetics and growth strategies of sympatric Antarctic and sub Antarctic fur seal pups, at Iles Crozet |
title_full |
The comparative energetics and growth strategies of sympatric Antarctic and sub Antarctic fur seal pups, at Iles Crozet |
title_fullStr |
The comparative energetics and growth strategies of sympatric Antarctic and sub Antarctic fur seal pups, at Iles Crozet |
title_full_unstemmed |
The comparative energetics and growth strategies of sympatric Antarctic and sub Antarctic fur seal pups, at Iles Crozet |
title_sort |
comparative energetics and growth strategies of sympatric antarctic and sub antarctic fur seal pups, at iles crozet |
publisher |
SJSU ScholarWorks |
publishDate |
2003 |
url |
https://scholarworks.sjsu.edu/biol_pub/24 https://doi.org/10.1242/jeb.00703 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Arctocephalus gazella |
genre_facet |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Arctocephalus gazella |
op_source |
Faculty Publications, Biological Sciences |
op_relation |
https://scholarworks.sjsu.edu/biol_pub/24 doi:10.1242/jeb.00703 http://dx.doi.org/10.1242/jeb.00703 |
op_rights |
http://creativecommons.org/licenses/by/3.0/ |
op_doi |
https://doi.org/10.1242/jeb.00703 |
container_title |
Journal of Experimental Biology |
container_volume |
206 |
container_issue |
24 |
container_start_page |
4497 |
op_container_end_page |
4506 |
_version_ |
1772809678440366080 |