John (Jack) Terhune
My primary research interests are concerned with communication and behaviour of marine mammals with particular emphasis on underwater acoustical communication of seals. Some polar seal species can, under optimal conditions, communicate over distances of 25 km. The vast majority of underwater vocalizations have a much shorter range however. The tendency for many seal species to form large breeding herds often results in very high numbers of simultaneous underwater calls. The individual seal thus has to compete (or cooperate with others) to have its message heard. My current research projects include examining the aspects of harp and Weddell seal vocalizations which will reduce masking effects of background noises (including the calls of other seals). Other studies will examine the possible influences of underwater sounds from acoustic deterrent devices used at aquaculture cage sites on the behaviour and distribution of seals and harbour porpoises in the Bay of Fundy, Canada.
Research Keywords:
seals; bio-acoustics; vocalizations; hearing; underwater sound; communication; masking; noise; marine mammals; behaviour; sensory physiology; vigilance