Temporal patterns of foraging activities of northern gannets, Morus bassanus, in the northwest Atlantic Ocean
We investigated time allocation and diel rhythms in foraging northern gannets (Morus bassanus). Chick-rearing adults on Funk Island, Newfoundland, Canada, were equipped with different types of data loggers. We found no effects of the devices on the birds' behaviour or breeding success. A total...
Published in: | Canadian Journal of Zoology |
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Language: | English |
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Canadian Science Publishing
2003
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Online Access: | http://dx.doi.org/10.1139/z03-027 http://www.nrcresearchpress.com/doi/pdf/10.1139/z03-027 |
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crcansciencepubl:10.1139/z03-027 2024-10-13T14:09:08+00:00 Temporal patterns of foraging activities of northern gannets, Morus bassanus, in the northwest Atlantic Ocean Garthe, Stefan Benvenuti, Silvano Montevecchi, William A 2003 http://dx.doi.org/10.1139/z03-027 http://www.nrcresearchpress.com/doi/pdf/10.1139/z03-027 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 81, issue 3, page 453-461 ISSN 0008-4301 1480-3283 journal-article 2003 crcansciencepubl https://doi.org/10.1139/z03-027 2024-09-19T04:09:47Z We investigated time allocation and diel rhythms in foraging northern gannets (Morus bassanus). Chick-rearing adults on Funk Island, Newfoundland, Canada, were equipped with different types of data loggers. We found no effects of the devices on the birds' behaviour or breeding success. A total of 25 foraging trips were recorded from 16 birds. Foraging- trip durations (median 13.5 h, range 3.039.2 h) showed a bimodal distribution, coinciding with a partitioning of foraging trips into 1- and 2-day trips. Some individuals were consistent in performing either 1- or 2-day trips. During foraging trips, gannets were flying, on average, 44% of the time. Foraging activities exhibited a clear diel rhythm. Flight and diving activity was concentrated during early morning and late afternoon, with reduced activity during midday. Gannets were inactive at night. Flight time between the terminal dive of a foraging trip and arrival at the colony was significantly longer during 2-day trips (94 ± 22 min; mean ± SD) than during 1-day trips (51 ± 22 min). Water masses visited differed between 1- and 2-day trips. We could find no evidence for a clear dual foraging strategy, although birds were exploiting more distant waters during 2-day trips, as has been found for many procellariform species. Article in Journal/Newspaper Newfoundland Northwest Atlantic Canadian Science Publishing Canada Funk Island ENVELOPE(-53.181,-53.181,49.750,49.750) Canadian Journal of Zoology 81 3 453 461 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
We investigated time allocation and diel rhythms in foraging northern gannets (Morus bassanus). Chick-rearing adults on Funk Island, Newfoundland, Canada, were equipped with different types of data loggers. We found no effects of the devices on the birds' behaviour or breeding success. A total of 25 foraging trips were recorded from 16 birds. Foraging- trip durations (median 13.5 h, range 3.039.2 h) showed a bimodal distribution, coinciding with a partitioning of foraging trips into 1- and 2-day trips. Some individuals were consistent in performing either 1- or 2-day trips. During foraging trips, gannets were flying, on average, 44% of the time. Foraging activities exhibited a clear diel rhythm. Flight and diving activity was concentrated during early morning and late afternoon, with reduced activity during midday. Gannets were inactive at night. Flight time between the terminal dive of a foraging trip and arrival at the colony was significantly longer during 2-day trips (94 ± 22 min; mean ± SD) than during 1-day trips (51 ± 22 min). Water masses visited differed between 1- and 2-day trips. We could find no evidence for a clear dual foraging strategy, although birds were exploiting more distant waters during 2-day trips, as has been found for many procellariform species. |
format |
Article in Journal/Newspaper |
author |
Garthe, Stefan Benvenuti, Silvano Montevecchi, William A |
spellingShingle |
Garthe, Stefan Benvenuti, Silvano Montevecchi, William A Temporal patterns of foraging activities of northern gannets, Morus bassanus, in the northwest Atlantic Ocean |
author_facet |
Garthe, Stefan Benvenuti, Silvano Montevecchi, William A |
author_sort |
Garthe, Stefan |
title |
Temporal patterns of foraging activities of northern gannets, Morus bassanus, in the northwest Atlantic Ocean |
title_short |
Temporal patterns of foraging activities of northern gannets, Morus bassanus, in the northwest Atlantic Ocean |
title_full |
Temporal patterns of foraging activities of northern gannets, Morus bassanus, in the northwest Atlantic Ocean |
title_fullStr |
Temporal patterns of foraging activities of northern gannets, Morus bassanus, in the northwest Atlantic Ocean |
title_full_unstemmed |
Temporal patterns of foraging activities of northern gannets, Morus bassanus, in the northwest Atlantic Ocean |
title_sort |
temporal patterns of foraging activities of northern gannets, morus bassanus, in the northwest atlantic ocean |
publisher |
Canadian Science Publishing |
publishDate |
2003 |
url |
http://dx.doi.org/10.1139/z03-027 http://www.nrcresearchpress.com/doi/pdf/10.1139/z03-027 |
long_lat |
ENVELOPE(-53.181,-53.181,49.750,49.750) |
geographic |
Canada Funk Island |
geographic_facet |
Canada Funk Island |
genre |
Newfoundland Northwest Atlantic |
genre_facet |
Newfoundland Northwest Atlantic |
op_source |
Canadian Journal of Zoology volume 81, issue 3, page 453-461 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z03-027 |
container_title |
Canadian Journal of Zoology |
container_volume |
81 |
container_issue |
3 |
container_start_page |
453 |
op_container_end_page |
461 |
_version_ |
1812815998094409728 |