title: Vocalizations of Amazon river dolphins (Inia geoffrensis): Characterization, effect of physical environment and differences between populations.
abstract: The vocal repertoire of the Amazon river dolphin and its geographic variations are still poorly known, especially in relation to ecological variables. Here the acoustic characteristics of low frequency pulsed vocalizations, with single or multiple pulses, recorded in two protected areas of the Amazon were described and differences in acoustic emissions related to water properties were analyzed. Both frequency and time parameters differ relative to abiotic condition of water turbidity. Changes in the animals' acoustic behavior might be due to differences in sound propagation between rich-sediment water and clear water. Geographic variation was found in frequency and time parameters, requiring further investigation.
authors.affiliation: Laboratório de Ecologia Comportamental e Bioacústica, Departamento de Zoologia, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Rua José Lourenço Kelmer, s/n - Campus Universitário, Bairro São Pedro, 36036-900 Juiz de Fora, Minas Gerais, Brasil.
authors.forename: Thiago Orion Simões
authors.initials: TO
authors.lastname: Amorim
authors.affiliation: Laboratório de Ecologia Comportamental e Bioacústica, Departamento de Zoologia, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Rua José Lourenço Kelmer, s/n - Campus Universitário, Bairro São Pedro, 36036-900 Juiz de Fora, Minas Gerais, Brasil.
authors.forename: Artur
authors.initials: A
authors.lastname: Andriolo
authors.affiliation: Laboratório de Ecologia Comportamental e Bioacústica, Departamento de Zoologia, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Rua José Lourenço Kelmer, s/n - Campus Universitário, Bairro São Pedro, 36036-900 Juiz de Fora, Minas Gerais, Brasil.
authors.forename: Sarah S
authors.initials: SS
authors.lastname: Reis
authors.affiliation: Marine and Environmental Sciences Centre, ISPA - Instituto Universitário, Rua Jardim do Tabaco, 34, 1149-041 Lisboa, P-1149-041 Portugal.
authors.forename: Manuel E
authors.initials: ME
authors.lastname: dos Santos
mesh_terms: D000162:Acoustics; D000818:Animals; D001938:Brazil; D004289:Dolphins / Q000145:classification* / Q000502:physiology*; D004455:Echolocation; D017753:Ecosystem; D004784:Environmental Monitoring; D009038:Motion; D045483:Rivers; D013016:Sound; D013018:Sound Spectrography; D013997:Time Factors; D014828:Vocalization, Animal / Q000145:classification*; D014867:Water
chemical_list: D014867:Water