[1] Univ Fed Rio Grande FURG, Lab Ecol & Conservacao Megafauna Marinha EcoMega, Inst Oceanog, Av Italia Km 8 S-N, BR-96201900 Rio Grande, RS, Brazil
[2] Univ Pretoria, Mammal Res Inst, Dept Zool & Entomol, Whale Unit, ZA-7200 Hermanus, South Africa
[3] Univ Fed Rio Grande do Norte UFRN, Ctr Biociencias, Lab Bioacust LaB, Av Senador Salgado Filho 3000, BR-59078970 Natal, RN, Brazil
[4] Univ Fed Rio Grande FURG, Programa Posgrad Oceanog Biol, Inst Oceanog, Av Italia Km 8 S-N, BR-96201900 Rio Grande, RS, Brazil
[5] Inst Caipora, Servidao Olibio Correa de Souza 309,Apt 04, BR-88066455 Florianopolis, SC, Brazil