P.P. Shirshov Institute of Oceanology, RAS
117997 Moscow, Nakhimovsky Prospect, 36
This article considers one of categories of the underwater sounds produced by bottle-nosed dolphin (Tursiops truncatus ) — whistles. We compare results of our own recent studies (both under conditions of a dolphinarium, and in natural habitats) with the data obtained earlier by other researchers. It is shown that the vast majority of whistle types are produced only by concrete individuals. The 'center' of a repertoire is a 'signature whistle' specific to each individual and dominating in its repertoire; besides, there are types of whistles which aren't 'signatures' (some of them are found for the first time). In this regard, we formulated a broader term 'personified signals'; the concept of 'permanent signal context' is proposed as a necessary condition for ensuring normal life activity of the species.