Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.12/1806
Título: Whistles of bottlenose dolphins (Tursiops truncatus) in the Sado Estuary, Portugal: Characteristics, production rates, and long-term contour stability
Autor: Santos, Manuel Eduardo dos
Louro, Sónia
Couchinho, Miguel Nogueira
Brito, Cristina Maria
Palavras-chave: Whistles
Acoustic production
Bottlenose dolphin
Tursiops truncatus
Activity patterns
Sado Estuary
Data: 2005
Editora: Western Illinois University
Citação: Aquatic Mammals, 31 (4), 453-462
Resumo: This study focuses on the whistle characteristics and production patterns of bottlenose dolphins (Tursiops truncatus) resident in the Sado Estuary, Portugal. Recordings and observations were conducted inside the estuary and in adjacent coastal waters using single hydrophones between 1987 and 2000. In the groups sampled, the mean number of whistles emitted per minute per animal was 0.28. The acoustic characteristics of a sample of 735 whistles were measured and compared with data from other Tursiops populations, showing that, in a pattern of overall similarity, the whistles recorded in the Sado are relatively long and the frequency range used is relatively wide. Mean peak frequency was 9.2 kHz. About 30% of the whistles were stereotyped, and remarkable stability was found in several contours over a 12-year period. No relation was found between dolphin group size and whistle rate, suggesting some restriction in production; and no relation was found between dolphin group size and the emission of different contours. Significant variation was found between episodes of simple travel and more aroused activities in terms of the production of whistles in general and also of different whistle contours.
Peer review: yes
URI: http://hdl.handle.net/10400.12/1806
ISSN: 0167-5427
Aparece nas colecções:BMAR - Artigos em revistas internacionais

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