HOPE report

Number: 23-011

The study of acoustic behavior of wild small dolphins in Chile

Report: Yoshida Yayoi

Date: 2012/1/25 - 2012/3/30

In order to study acoustic behaviors of Chilean dolphins (Cephalorhynchus eutropia) and Commerson's dolphin (Cephalorhynchus commersonii) in South America, I visited the Cove of Chullec located to the east of Chiloe island in South Chile, from January to February, 2012. In the field research, species, location, group size, behavior and sounds were recorded for each dolphins observed from the survey boat. I could observed some Chilean dolphins and Peals dolphins (Lagenorhynchus australis) which are the dolphin indigenous to South America. There were the dynamic edd and flood tide in the Cove of Chullec. The relation between a particular environment and the activity of dolphin like the foraging and resting are quite interesting. In order to study the acoustic behaviors of Commerson's and Chilean dolphins, we visited Fitz Roy Channel located on the north of Punta Arenas, Chile, on March, 2012. Fitz Roy Channel is a narrow channel of about 3km in width and 15km in length exposed to strong winds and currents all the year round. Both species inhabited in this Channel and they sometime made a same group. Their difference in the characteristics of the acoustic, behavior and body colors are very interesting. The factors of evolution in this genus may make reveal by the comparing with their differences and resemblances.

Mix group of Commerson's and Chilean

Group of Commerson's

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