Research Article
Lubis MZ*, Wulandari PD, Ha
Abstract
Bioacoustics is a combination between biology and acoustic study which usually refers to a study on sound production, dispersion through elastic media, and reception in animals, including humans. Bio sonar signals dolphin radiated along the beam axis of an Atlantic bottlenose dolphin resemble short transient oscillations. The purpose of this research is to measure, analyse, distinguish dolphin sound characteristics and detect the click sound by the dolphins. Indo-pacific bottlenose dolphins, maintained in captivity, Indonesia, had the lowest intensity of 18.76 dB while the highest were 32.02 dB with 100% percentage. Sound frequency range of Indo-pacific bottlenose dolphins in captivity, Indonesia was between 13.211 – 15.245 Hz. The percentage maximum intensity in the frequency is 14 kHz can be seen the percentage shown in the amount of 100% and minimum percentage of 75% in frequency 13 kHz sounds are probably produced by air movements in the nasal plugs. Sub frequency of 10 kHz has a value of 649.89 × 103, and 14 kHz with anti-log value of 782.82 × 103. Frequency of the sounds produced by a bottlenose dolphin ranges from 0.2 to 150 kHz. The lower frequency vocalizations (0.2 to 50 kHz) are likely used in social communication. Social signals have their most energy at frequencies less than 40 kHz. Higher frequency clicks (40 to 150 kHz) are primarily used for echolocation.