Ruídos antropogênicos e sua influência na ecologia do boto-cinza (Sotalia guianensis) em três regiões do litoral brasileiro

Abstract

The Sotalia guianensis dolphin occurs in the western Atlantic Ocean, from the south of Brazil until Central America. It is coastal specie, much susceptible to human generated impacts, as anthropogenic noises, which in general causes potential impacts in marine mammals’ populations, because the emission and reception of sound signals plays a complex and vital role in this populations’ ecology through many different ways. This study reviewed the acoustic repertoire and potentials anthropic impacts on populations of Guiana dolphin (S. guianensis) through its occurrence, and described and compared the anthropogenic noises with the acoustic repertoire of three brazilians populations: Cananéia Estuary - SP, Caravelas Estuary - BA e Praia da Pipa - RN. Data were collected similarly in these three sites, during boats surveys using hidrophones and audio recorders. Results showed overlapping of the S. guianensis repertoire and noises produced from boats, dredge activities and wood-barges, possibly leading to harms on individuals and populations. This methodology showed to be an important tool in coastal management, and can be used to evaluate acoustic impacts over others populations of marine species.