Early mortality and perinatal growth in the subantarctic fur seals Arctocephalus tropicalis on Amsterdam Island
Early mortality and Dug growth during the perinatal period were investigated in pups of the subantarctic fur seal Arctocephalus tropicalis on Amsterdam Island. Mothers that were shorter in body length and expected to be younger, gave birth earlier in the pupping season, compared with longer/older mo...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2000
|
Subjects: | |
Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/early-mortality-and-perinatal-growth-in-the-subantarctic-fur-seals-arctocephalus-tropicalis-on-amsterdam-island(5db34718-b824-4728-aea0-0e8ac8566d60).html |
id |
ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/5db34718-b824-4728-aea0-0e8ac8566d60 |
---|---|
record_format |
openpolar |
spelling |
ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/5db34718-b824-4728-aea0-0e8ac8566d60 2023-05-15T13:22:25+02:00 Early mortality and perinatal growth in the subantarctic fur seals Arctocephalus tropicalis on Amsterdam Island Georges, Jean-Yves Guinet, C 2000-07 https://risweb.st-andrews.ac.uk/portal/en/researchoutput/early-mortality-and-perinatal-growth-in-the-subantarctic-fur-seals-arctocephalus-tropicalis-on-amsterdam-island(5db34718-b824-4728-aea0-0e8ac8566d60).html eng eng info:eu-repo/semantics/restrictedAccess Georges , J-Y & Guinet , C 2000 , ' Early mortality and perinatal growth in the subantarctic fur seals Arctocephalus tropicalis on Amsterdam Island ' , Journal of Zoology , vol. 251 , pp. 277-287 . Amsterdam Island Arctocephalus tropicalis subantarctic fur seal parturition perinatal period mortality CALLORHINUS-URSINUS MATERNAL INVESTMENT SOUTH-GEORGIA POSTNATAL-GROWTH FETAL GROWTH BIRD-ISLAND GAZELLA MASS AGE PUPS article 2000 ftunstandrewcris 2021-12-26T14:10:34Z Early mortality and Dug growth during the perinatal period were investigated in pups of the subantarctic fur seal Arctocephalus tropicalis on Amsterdam Island. Mothers that were shorter in body length and expected to be younger, gave birth earlier in the pupping season, compared with longer/older mothers. Pups burn early were often still-born, suggesting that shorter/younger mothers that gave birth early in the season were not able to carry their foetuses to term. Pregnant females arrived ashore 1.4 days before giving birth, regardless of the date and their body condition. Then was a positive relationship between maternal body length and pup birth mass. Consistently, birth mass increased throughout the pupping period. After parturition, mothers suckled their pups during an average 8.7-day postnatal period that was significantly shorter in mothers giving birth late in the season. However, the absolute gain in pup mass was 1.5 kg regardless of the birth date, suggesting that mothers did not leave their pups before they had transferred a given amount of body reserves to them. We propose that pups born late grew faster because they were bigger at birth and because their mothers were likely to be more experienced. Mothers in good condition, nursing male pups transferred more milk and therefore greater mass to their pup, whereas mothers in poor condition were unable to do so. Such differences did not occur in smaller female pups, suggesting that pup growth was limited by maternal resources in male pups but not in female pups. The lack of a relationship between birth mass and absolute gain during the perinatal period suggests that mass at birth determined pup body mass after the perinatal period. Body mass is an important factor in growth rate and survival during the period of pup dependence. Article in Journal/Newspaper Amsterdam Island Bird Island Callorhinus ursinus University of St Andrews: Research Portal Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Amsterdam Island Arctocephalus tropicalis subantarctic fur seal parturition perinatal period mortality CALLORHINUS-URSINUS MATERNAL INVESTMENT SOUTH-GEORGIA POSTNATAL-GROWTH FETAL GROWTH BIRD-ISLAND GAZELLA MASS AGE PUPS |
spellingShingle |
Amsterdam Island Arctocephalus tropicalis subantarctic fur seal parturition perinatal period mortality CALLORHINUS-URSINUS MATERNAL INVESTMENT SOUTH-GEORGIA POSTNATAL-GROWTH FETAL GROWTH BIRD-ISLAND GAZELLA MASS AGE PUPS Georges, Jean-Yves Guinet, C Early mortality and perinatal growth in the subantarctic fur seals Arctocephalus tropicalis on Amsterdam Island |
topic_facet |
Amsterdam Island Arctocephalus tropicalis subantarctic fur seal parturition perinatal period mortality CALLORHINUS-URSINUS MATERNAL INVESTMENT SOUTH-GEORGIA POSTNATAL-GROWTH FETAL GROWTH BIRD-ISLAND GAZELLA MASS AGE PUPS |
description |
Early mortality and Dug growth during the perinatal period were investigated in pups of the subantarctic fur seal Arctocephalus tropicalis on Amsterdam Island. Mothers that were shorter in body length and expected to be younger, gave birth earlier in the pupping season, compared with longer/older mothers. Pups burn early were often still-born, suggesting that shorter/younger mothers that gave birth early in the season were not able to carry their foetuses to term. Pregnant females arrived ashore 1.4 days before giving birth, regardless of the date and their body condition. Then was a positive relationship between maternal body length and pup birth mass. Consistently, birth mass increased throughout the pupping period. After parturition, mothers suckled their pups during an average 8.7-day postnatal period that was significantly shorter in mothers giving birth late in the season. However, the absolute gain in pup mass was 1.5 kg regardless of the birth date, suggesting that mothers did not leave their pups before they had transferred a given amount of body reserves to them. We propose that pups born late grew faster because they were bigger at birth and because their mothers were likely to be more experienced. Mothers in good condition, nursing male pups transferred more milk and therefore greater mass to their pup, whereas mothers in poor condition were unable to do so. Such differences did not occur in smaller female pups, suggesting that pup growth was limited by maternal resources in male pups but not in female pups. The lack of a relationship between birth mass and absolute gain during the perinatal period suggests that mass at birth determined pup body mass after the perinatal period. Body mass is an important factor in growth rate and survival during the period of pup dependence. |
format |
Article in Journal/Newspaper |
author |
Georges, Jean-Yves Guinet, C |
author_facet |
Georges, Jean-Yves Guinet, C |
author_sort |
Georges, Jean-Yves |
title |
Early mortality and perinatal growth in the subantarctic fur seals Arctocephalus tropicalis on Amsterdam Island |
title_short |
Early mortality and perinatal growth in the subantarctic fur seals Arctocephalus tropicalis on Amsterdam Island |
title_full |
Early mortality and perinatal growth in the subantarctic fur seals Arctocephalus tropicalis on Amsterdam Island |
title_fullStr |
Early mortality and perinatal growth in the subantarctic fur seals Arctocephalus tropicalis on Amsterdam Island |
title_full_unstemmed |
Early mortality and perinatal growth in the subantarctic fur seals Arctocephalus tropicalis on Amsterdam Island |
title_sort |
early mortality and perinatal growth in the subantarctic fur seals arctocephalus tropicalis on amsterdam island |
publishDate |
2000 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/early-mortality-and-perinatal-growth-in-the-subantarctic-fur-seals-arctocephalus-tropicalis-on-amsterdam-island(5db34718-b824-4728-aea0-0e8ac8566d60).html |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
geographic |
Bird Island |
geographic_facet |
Bird Island |
genre |
Amsterdam Island Bird Island Callorhinus ursinus |
genre_facet |
Amsterdam Island Bird Island Callorhinus ursinus |
op_source |
Georges , J-Y & Guinet , C 2000 , ' Early mortality and perinatal growth in the subantarctic fur seals Arctocephalus tropicalis on Amsterdam Island ' , Journal of Zoology , vol. 251 , pp. 277-287 . |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1766364805455675392 |