Swim speeds of free-ranging great cormorants
International audience Information about foraging speeds is particularly valuable when the impact of a predator species upon a community of prey has to be defined, as in the case of great cormorants. We measured the swim speed of 12 (six males and six females) free-ranging great cormorants Phalacroc...
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Online Access: | https://hal.science/hal-00127343 https://doi.org/10.1007/s00227-005-0242-8 |
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ftccsdartic:oai:HAL:hal-00127343v1 2024-02-27T08:41:08+00:00 Swim speeds of free-ranging great cormorants Ropert‐coudert, Yan Grémillet, D. Kato, A. National Insitute of Polar Research National Institute of Polar Research Tokyo (NiPR) Département Ecologie, Physiologie et Ethologie (DEPE-IPHC) Institut Pluridisciplinaire Hubert Curien (IPHC) Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS) 2006 https://hal.science/hal-00127343 https://doi.org/10.1007/s00227-005-0242-8 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00227-005-0242-8 hal-00127343 https://hal.science/hal-00127343 doi:10.1007/s00227-005-0242-8 ISSN: 0025-3162 EISSN: 1432-1793 Marine Biology https://hal.science/hal-00127343 Marine Biology, 2006, 149, pp.415-422. ⟨10.1007/s00227-005-0242-8⟩ [SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE] info:eu-repo/semantics/article Journal articles 2006 ftccsdartic https://doi.org/10.1007/s00227-005-0242-8 2024-01-28T03:53:34Z International audience Information about foraging speeds is particularly valuable when the impact of a predator species upon a community of prey has to be defined, as in the case of great cormorants. We measured the swim speed of 12 (six males and six females) free-ranging great cormorants Phalacrocorax carbo, foraging off the Greenland coast during the summer of 2003, using miniaturized data-loggers. Although mean body mass of males was 27% greater than that of females, and mean swim speed of males were 29–57% higher than that of females during foraging phases (but not descent phases) of dives, these differences in speeds were not significant due to high variances. Birds descended to the mean maximum depth of 4.7 m at an average speed of 1.6±0.5 m s1, a speed similar to that measured in captive cormorants in previous studies. Although bursts of up to 4 m s1 were recorded, speed usually decreased during the deepest (foraging) phase of dives, being on average 0.8±0.6 m s1. Speeds measured here should be taken with caution, because the large propeller loggers used to measure speed directly decreased descent speeds by up to 0.5 m s1 when compared to smaller depthonly loggers. Cormorants in Greenland seem to combine two searching strategies, one requiring low speed to scan the water column or benthos, and one requiring high speed to pursue prey. These two strategies depend on the two main habitats of their prey: pelagic or demersal. Article in Journal/Newspaper Greenland Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Greenland Marine Biology 149 3 415 422 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE] |
spellingShingle |
[SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE] Ropert‐coudert, Yan Grémillet, D. Kato, A. Swim speeds of free-ranging great cormorants |
topic_facet |
[SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE] |
description |
International audience Information about foraging speeds is particularly valuable when the impact of a predator species upon a community of prey has to be defined, as in the case of great cormorants. We measured the swim speed of 12 (six males and six females) free-ranging great cormorants Phalacrocorax carbo, foraging off the Greenland coast during the summer of 2003, using miniaturized data-loggers. Although mean body mass of males was 27% greater than that of females, and mean swim speed of males were 29–57% higher than that of females during foraging phases (but not descent phases) of dives, these differences in speeds were not significant due to high variances. Birds descended to the mean maximum depth of 4.7 m at an average speed of 1.6±0.5 m s1, a speed similar to that measured in captive cormorants in previous studies. Although bursts of up to 4 m s1 were recorded, speed usually decreased during the deepest (foraging) phase of dives, being on average 0.8±0.6 m s1. Speeds measured here should be taken with caution, because the large propeller loggers used to measure speed directly decreased descent speeds by up to 0.5 m s1 when compared to smaller depthonly loggers. Cormorants in Greenland seem to combine two searching strategies, one requiring low speed to scan the water column or benthos, and one requiring high speed to pursue prey. These two strategies depend on the two main habitats of their prey: pelagic or demersal. |
author2 |
National Insitute of Polar Research National Institute of Polar Research Tokyo (NiPR) Département Ecologie, Physiologie et Ethologie (DEPE-IPHC) Institut Pluridisciplinaire Hubert Curien (IPHC) Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Ropert‐coudert, Yan Grémillet, D. Kato, A. |
author_facet |
Ropert‐coudert, Yan Grémillet, D. Kato, A. |
author_sort |
Ropert‐coudert, Yan |
title |
Swim speeds of free-ranging great cormorants |
title_short |
Swim speeds of free-ranging great cormorants |
title_full |
Swim speeds of free-ranging great cormorants |
title_fullStr |
Swim speeds of free-ranging great cormorants |
title_full_unstemmed |
Swim speeds of free-ranging great cormorants |
title_sort |
swim speeds of free-ranging great cormorants |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-00127343 https://doi.org/10.1007/s00227-005-0242-8 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
ISSN: 0025-3162 EISSN: 1432-1793 Marine Biology https://hal.science/hal-00127343 Marine Biology, 2006, 149, pp.415-422. ⟨10.1007/s00227-005-0242-8⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00227-005-0242-8 hal-00127343 https://hal.science/hal-00127343 doi:10.1007/s00227-005-0242-8 |
op_doi |
https://doi.org/10.1007/s00227-005-0242-8 |
container_title |
Marine Biology |
container_volume |
149 |
container_issue |
3 |
container_start_page |
415 |
op_container_end_page |
422 |
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1792048383585681408 |