Vocalizations of Amazon river dolphins (Inia geoffrensis) : Characterization, effect of physical environment and differences between populations

Amorim, Thiago Orion Simões; Andriolo, Artur; Reis, Sarah S.; Santos, Manuel Eduardo dos

http://hdl.handle.net/10400.12/4499

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Authors

Amorim, Thiago Orion Simões

Andriolo, Artur

Reis, Sarah S.

Santos, Manuel Eduardo dos

Abstract(s)

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.