Effects of time–depth recorders on maternal foraging and attendance behavior of Antarctic fur seals ( Arctocephalus gazella)
We evaluated the difference in average durations of foraging trips and nursing visits to shore between one group of female Antarctic fur seals (Arctocephalus gazella) carrying radio transmitters only and another group carrying time–depth recorders (TDRs) and radio transmitters during their first fiv...
Published in: | Canadian Journal of Zoology |
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Canadian Science Publishing
1995
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Online Access: | http://dx.doi.org/10.1139/z95-182 http://www.nrcresearchpress.com/doi/pdf/10.1139/z95-182 |
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crcansciencepubl:10.1139/z95-182 2024-09-15T17:41:46+00:00 Effects of time–depth recorders on maternal foraging and attendance behavior of Antarctic fur seals ( Arctocephalus gazella) Walker, Brian G. Boveng, Peter L. 1995 http://dx.doi.org/10.1139/z95-182 http://www.nrcresearchpress.com/doi/pdf/10.1139/z95-182 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 73, issue 8, page 1538-1544 ISSN 0008-4301 1480-3283 journal-article 1995 crcansciencepubl https://doi.org/10.1139/z95-182 2024-08-15T04:09:29Z We evaluated the difference in average durations of foraging trips and nursing visits to shore between one group of female Antarctic fur seals (Arctocephalus gazella) carrying radio transmitters only and another group carrying time–depth recorders (TDRs) and radio transmitters during their first five postpartum foraging trip – nursing visit cycles. Data were collected from 105 different fur seals in five breeding seasons (1989 – 1990 to 1993 – 1994) on Seal Island, Antarctica. Average foraging-trip and nursing-visit durations were significantly greater for the seals carrying TDRs and radio transmitters than for seals carrying radio transmitters only (two-way ANOVA, year × instrument type; trip, P = 0.004; visit, P = 0.04). Historically, instrument-effect studies on marine animals have focused on smaller species and larger instrument to body size ratios. Because of small sample sizes (the number of instruments successfully deployed and retrieved) and the typically variable nature of data from TDRs, the statistical power to detect significant differences due to instrument effects has been low. The evidence of instrument effects on Antarctic fur seals has possible implications for studies utilizing devices attached to similar-sized animals: results may not be representative of the natural (non-instrumented) population. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seals Antarctica Arctocephalus gazella Seal Island Canadian Science Publishing Canadian Journal of Zoology 73 8 1538 1544 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
We evaluated the difference in average durations of foraging trips and nursing visits to shore between one group of female Antarctic fur seals (Arctocephalus gazella) carrying radio transmitters only and another group carrying time–depth recorders (TDRs) and radio transmitters during their first five postpartum foraging trip – nursing visit cycles. Data were collected from 105 different fur seals in five breeding seasons (1989 – 1990 to 1993 – 1994) on Seal Island, Antarctica. Average foraging-trip and nursing-visit durations were significantly greater for the seals carrying TDRs and radio transmitters than for seals carrying radio transmitters only (two-way ANOVA, year × instrument type; trip, P = 0.004; visit, P = 0.04). Historically, instrument-effect studies on marine animals have focused on smaller species and larger instrument to body size ratios. Because of small sample sizes (the number of instruments successfully deployed and retrieved) and the typically variable nature of data from TDRs, the statistical power to detect significant differences due to instrument effects has been low. The evidence of instrument effects on Antarctic fur seals has possible implications for studies utilizing devices attached to similar-sized animals: results may not be representative of the natural (non-instrumented) population. |
format |
Article in Journal/Newspaper |
author |
Walker, Brian G. Boveng, Peter L. |
spellingShingle |
Walker, Brian G. Boveng, Peter L. Effects of time–depth recorders on maternal foraging and attendance behavior of Antarctic fur seals ( Arctocephalus gazella) |
author_facet |
Walker, Brian G. Boveng, Peter L. |
author_sort |
Walker, Brian G. |
title |
Effects of time–depth recorders on maternal foraging and attendance behavior of Antarctic fur seals ( Arctocephalus gazella) |
title_short |
Effects of time–depth recorders on maternal foraging and attendance behavior of Antarctic fur seals ( Arctocephalus gazella) |
title_full |
Effects of time–depth recorders on maternal foraging and attendance behavior of Antarctic fur seals ( Arctocephalus gazella) |
title_fullStr |
Effects of time–depth recorders on maternal foraging and attendance behavior of Antarctic fur seals ( Arctocephalus gazella) |
title_full_unstemmed |
Effects of time–depth recorders on maternal foraging and attendance behavior of Antarctic fur seals ( Arctocephalus gazella) |
title_sort |
effects of time–depth recorders on maternal foraging and attendance behavior of antarctic fur seals ( arctocephalus gazella) |
publisher |
Canadian Science Publishing |
publishDate |
1995 |
url |
http://dx.doi.org/10.1139/z95-182 http://www.nrcresearchpress.com/doi/pdf/10.1139/z95-182 |
genre |
Antarc* Antarctic Antarctic Fur Seals Antarctica Arctocephalus gazella Seal Island |
genre_facet |
Antarc* Antarctic Antarctic Fur Seals Antarctica Arctocephalus gazella Seal Island |
op_source |
Canadian Journal of Zoology volume 73, issue 8, page 1538-1544 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z95-182 |
container_title |
Canadian Journal of Zoology |
container_volume |
73 |
container_issue |
8 |
container_start_page |
1538 |
op_container_end_page |
1544 |
_version_ |
1810488020450672640 |