A FUNDAMENTAL STUDY ON THE ACOUSTICAL BEHAVIOR OF BOTTLENOSE DOLPHIN,Tursiops truncatus

对慈济岛野生瓶鼻海豚和水族馆捕获瓶鼻海豚的哨声进行了记录和分析。个体发出的标志性哨声并不总是清晰的，在时间和频率上有一些变化，特别是在时间上。从4年的数据中识别出251种签名哨声，其中1999年识别出231种。这意味着许多签名的口哨被使用了很长时间。在这些哨声中，含有特征哨声的比率很高（90%以上），共观察到15种特征哨声的特殊组合，其中5种在不同的日、月、年中观察到。此外，在这些特定组合之间的哨声中还观察到一些特殊的特征哨声。似乎在记录的时间内听到的签名哨声显示了来自最小群体（家庭？）中的个人的哨声。一个组的特征哨声类型数小于8。

THE WHISTLES OF WILD BOTTLENOSE DOLPHINS OFF TSUJI ISLAND AND CAPTURED ONES IN AQUARIUM WERE RECORDED AND ANALAYZED. THE SIGNATURE WHISTLES FROM THE SAME INDIVIDUAL ARE NOT ALWAYS SAME AND THERE ARE SOME VARIATIONS IN TIME AND FREQUENCY, ESPECIALLY IN TIME. 251 KINDS OF THE SIGNATURE WHISTLES WERE RECOGNIZED FROM THE DATA OF 4 YEARS AND 231 KINDS OF THAT WERE RECOGNIZED IN 1999. THIS IS MEANING THAT MANY OF THE SAME SIGNATUTE WHISTLE ARE BEING UTLIZED FOR LONG TIME. AMONG THE WHISTLES, A RATIO CONTAINING SIGNATURE WHISTLE WAS VERY HIGH ( MORE THAN 90%).15 PARTICULAR COMBINATIONS OF SIGNATURE WHISTLES WERE OBSERVED AND 5 AMONG OF THEM WERE OBSERVED IN DIFFERENT PLURAL DAYS, MONTHS OR YEARS. MOREOVER, SOME PECULIAR SIGNATURE WHISTLES WERE ALSO OBSERVED DURING THE WHISTLE EMITTING BETWEEN THOSE PARTICULAR COMBINATIONS. IT SEEMS THAT SIGNATURE WHISTLES HEARD IN THE SAME RECORDED TIME ARE SHOWING THE WHISTLES FROM INDIVIDUALS IN THE SAME SMALL GROUP (FAMILY ?). NUMBERS OF SIGNATURE WHISTLE TYPES CONCERNED WITH ONE GROUP WERE LESS THAN 8.