Sex differences in mass loss rate and growth efficiency in Antarctic fur seal (Arctocephalus gazella) pups at Macquarie Island
We investigated the relationship between the mass gained by a pup during a period of maternal attendance (as an index of milk intake) and the duration of the preceding foraging trip in relation to the mass-specific rate of mass loss during fasting periods and the growth rate of Antarctic fur seal (A...
Published in: | Behavioral Ecology and Sociobiology |
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1999
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Online Access: | https://doi.org/10.1007/s002650050605 http://ecite.utas.edu.au/17066 |
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ftunivtasecite:oai:ecite.utas.edu.au:17066 2023-05-15T13:59:07+02:00 Sex differences in mass loss rate and growth efficiency in Antarctic fur seal (Arctocephalus gazella) pups at Macquarie Island Guinet, C Goldsworthy, SD Robinson, S 1999 https://doi.org/10.1007/s002650050605 http://ecite.utas.edu.au/17066 en eng Springer-Verlag http://dx.doi.org/10.1007/s002650050605 Guinet, C and Goldsworthy, SD and Robinson, S, Sex differences in mass loss rate and growth efficiency in Antarctic fur seal (Arctocephalus gazella) pups at Macquarie Island , Behavioral Ecology & Sociobiology, 46, (3) pp. 157-163. ISSN 0340-5443 (1999) [Refereed Article] http://ecite.utas.edu.au/17066 Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Refereed Article PeerReviewed 1999 ftunivtasecite https://doi.org/10.1007/s002650050605 2019-12-13T21:00:24Z We investigated the relationship between the mass gained by a pup during a period of maternal attendance (as an index of milk intake) and the duration of the preceding foraging trip in relation to the mass-specific rate of mass loss during fasting periods and the growth rate of Antarctic fur seal (Arctocephalus gazella) pups at Macquarie Island. We found that (1) serially weighed male pups grew significantly faster than females pups and that (2) fasting female pups lost mass at a significantly higher rate (2.55% day-1) than male pups (2.12% day-1) of the same mass; (3) during periods of maternal attendance, there were no intersexual differences in the amount of mass gained by pups of the same size, hence (4) female pups required a higher daily mass gain to grow at the same rate as male pups. Our results show that intersexual differences in growth rate may be accounted for by intersexual differences in mass-specific rate of mass loss, because females lost 0.42% more of their total mass per day (i.e. 4.2 g kg-1 day-1) compared with male pups of the same body mass. Despite intersexual differences in growth rates, our results indicate equality of maternal expenditure between the sexes. Intersexual differences in the rate of mass loss may be due to differences in the metabolic rate, activity level and/or body composition of male and female pups. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seal Arctocephalus gazella Macquarie Island eCite UTAS (University of Tasmania) Antarctic Behavioral Ecology and Sociobiology 46 3 157 163 |
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Open Polar |
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eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
spellingShingle |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Guinet, C Goldsworthy, SD Robinson, S Sex differences in mass loss rate and growth efficiency in Antarctic fur seal (Arctocephalus gazella) pups at Macquarie Island |
topic_facet |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
description |
We investigated the relationship between the mass gained by a pup during a period of maternal attendance (as an index of milk intake) and the duration of the preceding foraging trip in relation to the mass-specific rate of mass loss during fasting periods and the growth rate of Antarctic fur seal (Arctocephalus gazella) pups at Macquarie Island. We found that (1) serially weighed male pups grew significantly faster than females pups and that (2) fasting female pups lost mass at a significantly higher rate (2.55% day-1) than male pups (2.12% day-1) of the same mass; (3) during periods of maternal attendance, there were no intersexual differences in the amount of mass gained by pups of the same size, hence (4) female pups required a higher daily mass gain to grow at the same rate as male pups. Our results show that intersexual differences in growth rate may be accounted for by intersexual differences in mass-specific rate of mass loss, because females lost 0.42% more of their total mass per day (i.e. 4.2 g kg-1 day-1) compared with male pups of the same body mass. Despite intersexual differences in growth rates, our results indicate equality of maternal expenditure between the sexes. Intersexual differences in the rate of mass loss may be due to differences in the metabolic rate, activity level and/or body composition of male and female pups. |
format |
Article in Journal/Newspaper |
author |
Guinet, C Goldsworthy, SD Robinson, S |
author_facet |
Guinet, C Goldsworthy, SD Robinson, S |
author_sort |
Guinet, C |
title |
Sex differences in mass loss rate and growth efficiency in Antarctic fur seal (Arctocephalus gazella) pups at Macquarie Island |
title_short |
Sex differences in mass loss rate and growth efficiency in Antarctic fur seal (Arctocephalus gazella) pups at Macquarie Island |
title_full |
Sex differences in mass loss rate and growth efficiency in Antarctic fur seal (Arctocephalus gazella) pups at Macquarie Island |
title_fullStr |
Sex differences in mass loss rate and growth efficiency in Antarctic fur seal (Arctocephalus gazella) pups at Macquarie Island |
title_full_unstemmed |
Sex differences in mass loss rate and growth efficiency in Antarctic fur seal (Arctocephalus gazella) pups at Macquarie Island |
title_sort |
sex differences in mass loss rate and growth efficiency in antarctic fur seal (arctocephalus gazella) pups at macquarie island |
publisher |
Springer-Verlag |
publishDate |
1999 |
url |
https://doi.org/10.1007/s002650050605 http://ecite.utas.edu.au/17066 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctic Fur Seal Arctocephalus gazella Macquarie Island |
genre_facet |
Antarc* Antarctic Antarctic Fur Seal Arctocephalus gazella Macquarie Island |
op_relation |
http://dx.doi.org/10.1007/s002650050605 Guinet, C and Goldsworthy, SD and Robinson, S, Sex differences in mass loss rate and growth efficiency in Antarctic fur seal (Arctocephalus gazella) pups at Macquarie Island , Behavioral Ecology & Sociobiology, 46, (3) pp. 157-163. ISSN 0340-5443 (1999) [Refereed Article] http://ecite.utas.edu.au/17066 |
op_doi |
https://doi.org/10.1007/s002650050605 |
container_title |
Behavioral Ecology and Sociobiology |
container_volume |
46 |
container_issue |
3 |
container_start_page |
157 |
op_container_end_page |
163 |
_version_ |
1766267500269404160 |