Hydro Acoustics

At the surface, dolphins and whales spend very short time limiting our opportunity to watch them and many times they are not even visible. Active avoidance, bad sea state and night time are the main impediments. This is when an approach based on the sound that they produce (passive acoustic) becomes very useful.

Efforts at the Reserve
As soon as our underwater acoustic research line departed at Anihue Reserve (2010), supported by G. Paolo Sanino our scientific advisor with 15 years of experience on this matter, we quickly confirmed the potential of this cetacean research technique.

The areas protected from the waves and deep bedrock, are ideal to put the sensors away from unwanted sound sources (noise).

Using three types of umbilical hydrophones (underwater microphones calibrated to the local marine environment and deployed from our boats under total silence) and a sophisticated seafloor stand-alone device, created by Paolo (www.cmmrleviathan.org/ciencia_proyectos_SALu.htm), we are retrieving signals of both vocalizations (sounds attributed to communication) as well as echolocation emissions (sounds attributed to orientation and hunting purposes) of dolphins, porpoises and whales.

Our main goals are:
  • the acoustic description of the diverse marine environments around and nearby our Reserve;
  • to elaborate vocal repertoires of dolphins and whales that visit the area of study;
  • to analyze the vocal spatio-temporal variations of cetaceans between seasons and sites;
  • to compare the vocal variations in response to the presence of various types of vessels; and,
  • to implement a passive hydro acoustic network for real-time analysis.

Dolphin Vocalizations
To hear some vocalization of dolphins, please click the Play button below:

Hydro Acoustics
Hydro Acoustics
Hydro Acoustics

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