کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4397376 | 1305883 | 2008 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Shallow food for deep divers: Dynamic foraging behavior of male sperm whales in a high latitude habitat
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم آبزیان
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Groups of female and immature sperm whales live at low latitudes and show a stereotypical diving and foraging behavior with dives lasting about 45Â min to depths of between 400 and 1200Â m. In comparison, physically mature male sperm whales migrate to high latitudes where little is known about their foraging behavior and ecology. Here we use acoustic recording tags to study the diving and acoustic behavior of male sperm whales foraging off northern Norway. Sixty-five hours of tag data provide detailed information about the movements and sound repertoire of four male sperm whales performing 83 dives lasting between 6 and 60Â min. Dives ranged in depth between 14 and 1860Â m, with a median depth of 175Â m, and 92% of the surfacings lasted less than 15Â min. The four whales clicked for an average 91% (SDÂ =Â 10) of the dive duration, where the first usual click was produced at depths ranging between 4 and 218Â m and the last usual click at depths ranging between 1 and 1114Â m. Echolocation buzzes, which are used as an indication of prey capture attempts, were emitted at depths between 17 and 1860Â m, during both the descent and ascent phase of deep dives. The foraging behavior varied markedly with depth, with the timing and duration of prey capture attempts during shallow dives suggesting that the whales target more sparsely distributed prey. In contrast, deep dives involve frequent prey capture attempts and seem to target more dense food layers. The evidence of exploitation of different food layers, including epipelagic prey, is consistent with the hypothesis that male sperm whales may migrate to high latitudes to access a productive, multi-layered foraging habitat.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Experimental Marine Biology and Ecology - Volume 354, Issue 1, 4 January 2008, Pages 119-131
Journal: Journal of Experimental Marine Biology and Ecology - Volume 354, Issue 1, 4 January 2008, Pages 119-131
نویسندگان
Valeria Teloni, Johnson P. Mark, Miller J.O. Patrick, Madsen T. Peter,