Abstract
Whistle sound is a voice that is intended to echolocation, whistle sound is a major role in internal and inter-group communication. The objective research is to know the power spectral patterns and fluctuations in sound based on frequency of the sounds produced by dolphins and observing the position of dolphins. Noisy Time Domain (NTD) and behaviour using the underwater camera, and also comparing between time and sound spectrum. Data recording was taken at the Safari Park of Cisarua Bogor in Indonesia, by taking data in show pool. The results showed that salinity before feeding time in the show pool with replication 1,2, and 3 has salinity value that is equal to 30 ‰. Data at the show pool before feeding with replications 1,2, and 3 has a salinity of 29 ‰. Sound whistle 3 before feeding time of 28.03 dB with the frequency interval of 14 642 Hz-16000 Hz. F-test at the show pool before meals has heterogeneous value. Treat before meals at the show pool has a value of P <0.001 and P <0.001. Value Noisy Time Domain have differences with each other and have a lot of different sound patterns. In general, there are real differences are evidenced by F test on a range of time at each whistle on show pool in the time before meals. In general, there is a noticeable difference in the range of time at each whistle on show pool in the time before meals. The behaviour of dolphins have a habit that has the movement toward the surface of the pool and movement and position will be influenced frequency and intensity value.
Highlights
In Fisheries field studies in mammals of echolocation signals, data can be obtained from animals under natural conditions for which their sonar evolved
Power Spectral Density (PSD) is a variation of power as a function of the frequency spectrum in the form of density estimated using Fast Fourier Transform (FFT), PSD method is one of the modern spectral estimation technique proposed during this decade for identification of whistle sound and relation to the behavior of male bottle nose dolphin (Kostenko and Vasylyshyn, 2014)
Noisy time domain has the same relationship with the original spectrum produced (Figure 1 and 2)
Summary
In Fisheries field studies in mammals of echolocation signals, data can be obtained from animals under natural conditions for which their sonar evolved. From early recordings of male bottle nose dolphin biosonar, click source levels were estimated to be 170 dB re 1 lPa peak to peak (PP), with a frequency emphasis 35–60 kHz (Norris et al, 1961) These measurements were made of an animal in a relatively small and highly reverberant tank. Biosonar capabilities of male bottle nose dolphin under much less reverberant conditions with performed long-range target detection experiments with animals in a relatively shallow, open-water environment (Hastie et al, 2013) In these experiments, the dolphins emitted whistle with source levels of up to 228 dB re 1 lPa (PP) at 1 m and peak frequency above 100000 Hz when successfully echolocating a 5 cm steel sphere out to ranges of 89 m. The purpose of this study was to analyze the spectral use of Noisy Time Domains (NTD) for the sound and to see its relation to the behavior of male bottle nose dolphin in captivity
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