Acoustic and visual monitoring of Peale's dolphins (Lagenorhynchus australis) in the Magellan Strait.

Peale's dolphins are small odontocetes living in the south Cone of America. As a coastal species, they could be threatened by the growing use of industrial and comercial harbors in the Patagonia region. To the date, their behavior, use of habitat and acoustic productions are still very little known. We report the coupling of visual and acoustic monitoring of a population of Peale's dolphins in the Magellan Strait. A comparison of visual monitoring and data from several acoustic devices (three C-POD click loggers and HighBlue, a full wave recording device) is presented, assessing the feasibility of long term monitoring through acoustic recording. Finally, acoustic productions of this group of Peale's dolphins are compared to other groups of Peale's dolphins and other narrow band high frequency (NBHF) odontocetes of the region.