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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Signature whistles ： ウィキペディア英語版 Signature whistles Signature whistles are a form of dolphin vocalization emitted by bottlenose dolphins (''Tursiops truncates'').〔 They are used in communication within the species and have specialized functions and properties. Researchers define it as a whistle with a unique frequency curve that dominates in the repertoire of a dolphin. Each dolphin has a distinct signature whistle that no other dolphin has developed. They are typically used for locational purposes, however they also provide dolphins with identity information and behavioral context.〔〔 Signature whistles also play an important role in group cohesion and social interaction. ==Identification== Signature whistles can be recorded in the wild or in captivity.〔〔 Hydrophones are used in both cases, but the number of devices may vary based on the researcher's preference and methodology. Using multiple hydrophones allows the researchers to better identify which dolphin emitted which whistle.〔 Signature whistles are difficult to identify because bottlenose dolphins emit non-signature whistles as well. However, there is a distinct amount of time in between each signature whistle that helps researchers distinguish them from the rest of dolphin noises. Signature whistles are emitted within 1 to 10 milliseconds of each other.〔 Non-signature whistles occur with longer or shorter intervals between each whistle.〔 An early definition of signature whistles defined them as the most common whistle emitted when a dolphin is kept in isolation. This description restricted research designs to only studying dolphins in captivity. The current method for identifying signature whistles is known as signature identification, or SIGID. Developed by Janik and King, this method combines human observations with vocalization analysis. The vocalizations are recorded by a single hydrophone.〔 This method allows researchers to better identify signature whistles when studying wild dolphins because it can be used in situations where many dolphins emit whistles at the same time. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Signature whistles」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.