Growth rates of vibrissae of harbor seals ( Phoca vitulina) and Steller sea lions ( Eumetopias jubatus)
Growth rates of vibrissae (whiskers), which act as a temporal record of feeding in harbor seals (Phoca vitulina) and Steller sea lions (Eumetopias jubatus), were estimated using 13 C- and 15 N-labeled glycine followed by stable-isotope analysis. The labeled glycine was incorporated into keratin and...
Published in: | Canadian Journal of Zoology |
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Canadian Science Publishing
2001
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Online Access: | http://dx.doi.org/10.1139/z01-055 http://www.nrcresearchpress.com/doi/pdf/10.1139/z01-055 |
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crcansciencepubl:10.1139/z01-055 2024-09-15T18:10:39+00:00 Growth rates of vibrissae of harbor seals ( Phoca vitulina) and Steller sea lions ( Eumetopias jubatus) Hirons, Amy C Schell, Donald M St. Aubin, David J 2001 http://dx.doi.org/10.1139/z01-055 http://www.nrcresearchpress.com/doi/pdf/10.1139/z01-055 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 79, issue 6, page 1053-1061 ISSN 0008-4301 1480-3283 journal-article 2001 crcansciencepubl https://doi.org/10.1139/z01-055 2024-08-22T04:08:45Z Growth rates of vibrissae (whiskers), which act as a temporal record of feeding in harbor seals (Phoca vitulina) and Steller sea lions (Eumetopias jubatus), were estimated using 13 C- and 15 N-labeled glycine followed by stable-isotope analysis. The labeled glycine was incorporated into keratin and served as a temporal marker for growth-rate calculation. One captive harbor seal received two doses 147 days apart, while a second seal received one dose; vibrissae were analyzed after 86 and 154 days. The peak positions indicated that growth began in the fall, continued into spring, but ceased in June, with active growth rates of 0.33 mm/day. Two adult captive Steller sea lions each received two labeled doses during a 308-day period. After 427 days vibrissae in both sea lions showed two peaks corresponding to the markers; growth rates were calculated as 0.050.07 mm/day. Growth rates in captive juvenile and wild adult Steller sea lions, 0.100.17 mm/day, supported the assumption that major isotopic oscillations in vibrissae of wild sea lions were annual. The multiyear records imply that Steller sea lions retain their vibrissae; harbor seal vibrissae, in contrast, have periods of rapid growth and appear to be shed, at least in part, annually. Article in Journal/Newspaper harbor seal Phoca vitulina Canadian Science Publishing Canadian Journal of Zoology 79 6 1053 1061 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Growth rates of vibrissae (whiskers), which act as a temporal record of feeding in harbor seals (Phoca vitulina) and Steller sea lions (Eumetopias jubatus), were estimated using 13 C- and 15 N-labeled glycine followed by stable-isotope analysis. The labeled glycine was incorporated into keratin and served as a temporal marker for growth-rate calculation. One captive harbor seal received two doses 147 days apart, while a second seal received one dose; vibrissae were analyzed after 86 and 154 days. The peak positions indicated that growth began in the fall, continued into spring, but ceased in June, with active growth rates of 0.33 mm/day. Two adult captive Steller sea lions each received two labeled doses during a 308-day period. After 427 days vibrissae in both sea lions showed two peaks corresponding to the markers; growth rates were calculated as 0.050.07 mm/day. Growth rates in captive juvenile and wild adult Steller sea lions, 0.100.17 mm/day, supported the assumption that major isotopic oscillations in vibrissae of wild sea lions were annual. The multiyear records imply that Steller sea lions retain their vibrissae; harbor seal vibrissae, in contrast, have periods of rapid growth and appear to be shed, at least in part, annually. |
format |
Article in Journal/Newspaper |
author |
Hirons, Amy C Schell, Donald M St. Aubin, David J |
spellingShingle |
Hirons, Amy C Schell, Donald M St. Aubin, David J Growth rates of vibrissae of harbor seals ( Phoca vitulina) and Steller sea lions ( Eumetopias jubatus) |
author_facet |
Hirons, Amy C Schell, Donald M St. Aubin, David J |
author_sort |
Hirons, Amy C |
title |
Growth rates of vibrissae of harbor seals ( Phoca vitulina) and Steller sea lions ( Eumetopias jubatus) |
title_short |
Growth rates of vibrissae of harbor seals ( Phoca vitulina) and Steller sea lions ( Eumetopias jubatus) |
title_full |
Growth rates of vibrissae of harbor seals ( Phoca vitulina) and Steller sea lions ( Eumetopias jubatus) |
title_fullStr |
Growth rates of vibrissae of harbor seals ( Phoca vitulina) and Steller sea lions ( Eumetopias jubatus) |
title_full_unstemmed |
Growth rates of vibrissae of harbor seals ( Phoca vitulina) and Steller sea lions ( Eumetopias jubatus) |
title_sort |
growth rates of vibrissae of harbor seals ( phoca vitulina) and steller sea lions ( eumetopias jubatus) |
publisher |
Canadian Science Publishing |
publishDate |
2001 |
url |
http://dx.doi.org/10.1139/z01-055 http://www.nrcresearchpress.com/doi/pdf/10.1139/z01-055 |
genre |
harbor seal Phoca vitulina |
genre_facet |
harbor seal Phoca vitulina |
op_source |
Canadian Journal of Zoology volume 79, issue 6, page 1053-1061 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z01-055 |
container_title |
Canadian Journal of Zoology |
container_volume |
79 |
container_issue |
6 |
container_start_page |
1053 |
op_container_end_page |
1061 |
_version_ |
1810448239661416448 |