A5045408615- Marine animal studies overview
- Animal Vocal Communication and Behavior
- Underwater Acoustics Research
- Ichthyology and Marine Biology
- Underwater Vehicles and Communication Systems
- Marine and fisheries research
Universidade do Estado do Rio de Janeiro
2012-2020
There is no information about the whistles of rough-toothed dolphins in South Atlantic Ocean. This study characterizes whistle structure free-ranging recorded on Rio de Janeiro coast, southeastern Brazil, and compares it to that same species other regions. A total 340 were analyzed. Constant (N = 115; 33.8%) ascending 99; 29.1%) most common contours. The had their fundamental frequencies between 2.24 13.94 kHz. Whistles without inflection points frequently emitted 255; 75%). Some signals...
The present study evaluates variations in frequency and duration parameters of whistles four dolphin species (Sotalia guianensis, Steno bredanensis, Stenella frontalis, Tursiops truncatus), recorded the Rio de Janeiro State Coast, Southeastern Brazil. A total 487 were analyzed. Acoustic classified to by discriminant function analysis. Overall classification score was 72.5%, with highest obtained for S. bredanensis lowest frontalis. Most differences among that did not have their repertoires...
Guiana dolphins produce whistles with a higher frequency and less complexity than most other delphinid species. The present study used recording system sampling rate of 192 kHz to describe the high-frequency Sotalia guianensis in Guanabara Bay, Rio de Janeiro. Eleven acoustic parameters (start, end, minimum, maximum, delta, center peak frequency, duration, at 14, 12, 34 duration) were measured for all whistles. Whistles fundamental up 66.7 reported, thereby expanding known range this
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The use of autonomous passive acoustics is an efficient technique to monitor vocally active marine animals such as dolphins. Coupling acoustic recorders with unmanned vehicles allows data sampling through varying time scales and increase in the sample area relation fixed recorders. In present study, recorder was towed by surface vehicle, type Wave Glider, offshore waters Southeast Coast Brazil a period ten days, continuously along distance 377 km. Three sound detectors were used scan all...
Recordings of Steno bredanensis were done in Southeastern Brazilian coast during eleven days between 2013 and 2017. The system consisted a C54-XRS hydrophone (−165 dB re: 1 V/μPa, 0.009 to 100 kHz) Fostex FR-2 digital recorder with 192 kHz sample rate. inspected for burst-pulsed sounds Adobe audition 1.5 software 512 Hann window, 50% overlap. When they found, the sound was cut new file 2-s butterworth high-pass filter used when necessary. A burst-pulse considered analysis its pulses...