ECS 2012 Galway Abstract Book

ABSTRACTS OF POSTERS –CONSERVATION/MANAGEMENT

c 16 characterising habitat use by a resident bottlenose dolphin population within a Marine Park by means of passive acoustics

Lucia Di Iorio (1), Cédric Gervaise (2), Céline Liret (3), Philippe Le Niliot (4)

(1) ENSTA Bretagne (2) Gipsa-Lab (3) Océanopolis (4) Parc Naturel Marin d’Iroise

lucia.di_iorio@ensta-bretagne.fr

Long-term surveys of resident cetacean populations in coastal zones are one of the key objectives of management agencies in particular within Marine Parks or Marine Protected Areas. Knowledge on the habitat use and its natural variability are critical for evaluating potential disturbances caused by natural or human events. In temperate zones, the high seasonal variability in environmental conditions and human exploitation of coastal areas requires a year-round monitoring. Many cetacean species, including bottlenose dolphins (Tursiops truncatus), are known to vocalize extensively. Their repertoire and calls also convey information on their social structure and behaviour. The long-term study of their vocal output therefore represents a powerful complementary monitoring tool. Here we present the first results of a project aiming at evaluating the potential of passive acoustics in characterizing the spatiotemporal and functional use of the bottlenose dolphin population of the Iroise Marine Park. By deploying three autonomous recorders within the dolphin habitat that recorded continuously over four months and in all weather conditions, we found variations between the recording sites in terms of diel presence and vocal activity. The preliminary results also showed that the presence at the different locations was correlated with the time of the day and the tidal level. Furthermore, differences were found in the types of vocalizations recorded per site and per time of the day. These differences may indicate the presence of functional zones in terms of behaviour and social associations. This work shows the high potential of passive acoustics as a non-intrusive, long-term and weather-independent tool, to contribute to a better knowledge of the habitat use by a resident dolphin population. It also identifies acoustic proxies to be applied for management purposes.

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