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Diversity of monophonic and biphonic calls in mammal-eating and fish-eating killer whales of the North Pacificтезисы доклада
- Авторы: Filatova O.A., Deecke V.B., Ford J.K., Matkin C.O., Barrett-Lennard L.G., Burdin A.M., Hoyt E.
- Сборник: 26th Conference of the European Cetacean Society. Abstract book
- Тезисы
- Год издания: 2012
- Место издания: European Cetacean Society Galway, Ireland
- Первая страница: 156
- Аннотация: Killer whale groups have repertoires of stereotyped calls that are stable over the years. Some of these calls contain an overlapping high-frequency component, which is thought to enhance recognition and indicate the caller’s direction of movement. These calls are usually referred to as biphonic calls. It was shown previously that the diversity of monophonic calls was substantially higher than the diversity of biphonic calls in four populations of fish-eating (‘resident’) killer whales in the North Pacific. In this study we compared the diversity of call contours within and between mammal-eating (‘transient’) and several populations of fish-eating killer whales. We used recordings of mammal-eating killer whales from False Pass (Eastern Aleutian Islands), British Columbia (Canada) and Kamchatka (Russia), and recordings of fish-eating killer whales from British Columbia, Alaska and Kamchatka. Call frequency contours were extracted and compared using a dynamic time-warping algorithm. Diversity of monophonic and biphonic calls in mammal-eating killer whales followed the pattern revealed previously for the fish-eating populations: median similarity for monophonic calls (58%) was lower than the median similarity for biphonic calls (68%). Inter-population comparison showed that the monophonic repertoire of the mammal-eaters differed almost equally from those of all four fish-eating populations. In contrast, biphonic calls compared using the low-frequency component were the most similar to the Alaskan fish-eating population, while biphonic calls compared using both the low- and the high-frequency components were the most similar to the Southern Resident fish-eating population inhabiting the waters around southern Vancouver Island. Our results show that the low- and the high-frequency components of biphonic calls have different patterns of similarity across populations and suggest that monophonic and biphonic calls in both fish-eating and mammal-eating killer whales may evolve following different rules.
- Добавил в систему: Филатова Ольга Александровна