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Diving angle of great cormorants
https://doi.org/10.15094/00006225
https://doi.org/10.15094/00006225c5e3d85d-8c7c-4187-b1de-5831626b7363
名前 / ファイル | ライセンス | アクション |
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KJ00002366642 (340.6 kB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 2005-01-01 | |||||
タイトル | ||||||
タイトル | Diving angle of great cormorants | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | great cormorants, dive angle, shallow divers, prey-predators, pre-dive leap | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00006225 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
論文名よみ | ||||||
その他のタイトル | Diving angle of great cormorants | |||||
著者名(英) |
Ropert-Coudert,Yan
× Ropert-Coudert,Yan× Gremillet,David× Kato,Akiko |
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抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Seabirds can maximize the relative time spent at depths where prey occur by minimizing the commuting time taken to reach these depths. One way to achieve this goal is to modify dive angle, but there are few measures of dive-angle in free-foraging seabirds. In 2003, we monitored simultaneously the swimming speeds and diving depths of great cormorants (Phalacrocorax carbo) foraging off the Greenland coast, and used these data to reconstruct their descent angle. Both males and females dived on average <5 m, but some dives were up to 26 m. Dive angles did not differ between dive types (benthic, pelagic). Angles did not change much for dives <12 m but increased with increasing maximum depth in both males and females for dives>12 m. We suggest that birds are able to reduce their descent time for dives beyond this depth by performing pre-dive leaps that allow them to use the momentum of the fall to descend almost vertically and at great speeds. Such pre-dive leaps in shallower dives would be unsuitable because of the proximity of the seabed and the risk of startling prey. Finally, in contrast with deeper divers, descent angles were not steeper when undulations were observed in the depth profile of the previous dive, probably because birds feed on dispersed prey. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA11327019 | |||||
書誌情報 |
Polar bioscience 巻 18, p. 54-59, 発行日 2005-01-01 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |