Abstract

The Chilean dolphin Cephalorhynchus eutropia is an endemic species distributed along the central-southern coast of Chile. It is a coastal species recently classified as Near Threatened (NT) by the IUCN. Therefore, it is necessary to improve our bio-ecological knowledge of the species as well as to identify and quantify potential threats to ensure its conservation. This study focused on 1) the presence, behavior and habitat use of the Chilean dolphin off Constitución (35º20’S, 72º25’W); 2) identifies and quantifies preliminarily the impact of fisheries on the species; and 3) creates a local “working group” to implement actions in order to promote the conservation of the species. Chilean dolphins were sighted in 68% of surveys undertaken in the study area between June and December of 2009. The average group size was 6 individuals (DE=4, n=72). Three behavioral categories were assessed during the study (feeding, socializing and travelling). Feeding was mainly recorded in Quivolgo, where a mean of 8 fishing nets per day (DE=1.7) were recorded. 49% of the interviewed fishermen reported entanglements with the Chilean dolphin, but no specific site, season or frequency were identified. Local inhabitants stated the necessity to assess the impact of urban and industrial pollution as there is the perception they represent a major threat for the species. The community is also considering starting a “dolphinwatching” program as a complementary activity to fishing.