Passive acoustic monitoring of the diel and annual vocal behavior of the Black and Gold Howler Monkey

2021 ◽  
Vol 83 (3) ◽  
Author(s):  
Cristian Pérez‐Granados ◽  
Karl‐Ludwig Schuchmann
Keyword(s):  
Acoustic Monitoring ◽  
Howler Monkey ◽  
Vocal Behavior ◽  
Passive Acoustic Monitoring ◽  
Passive Acoustic

scholarly journals Passive Acoustic Monitoring and Automatic Detection of Diel Patterns and Acoustic Structure of Howler Monkey Roars

Diversity ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 566
Author(s):  
Leandro A. Do Nascimento ◽  
Cristian Pérez-Granados ◽  
Karen H. Beard
Keyword(s):  
Acoustic Monitoring ◽  
Recall Rate ◽  
Howler Monkey ◽  
Vocal Behavior ◽  
Acoustic Detection ◽  
Passive Acoustic Monitoring ◽  
Resource Defense ◽  
Daily Routines ◽  
Vocal Activity ◽  
Passive Acoustic

Nighttime studies are underrepresented in ecological research. Even well-known behaviors, such as the loud call of howler monkeys, are rarely studied at night. Our goal was to help fill this knowledge gap by studying the 24 h vocal behavior of the Guianan red howler monkey (Alouatta macconnelli) and to compare the acoustic structures of howling bouts made during the day to those made at night. We used passive acoustic monitoring coupled with automatic acoustic detection to study three groups of howlers over three months in the Viruá National Park, Roraima, Brazil. The automatic classifier we built detected 171 howling bouts with a 42% recall rate and 100% precision. Though primarily diurnal, howlers vocalized mainly at night. Greater vocal activity before nautical twilight might be associated with territorial and resource defense behaviors, with howlers calling from roosting sites before starting their daily routines. We also found that during the day, howling bouts were longer and had lower harmonic-to-noise ratios, lower frequencies, and more symmetric energy distributions than bouts at night. Our study adds to growing evidence that passive acoustic monitoring and automatic acoustic detection can be used to study primates and improve our understanding of their vocal behavior.

scholarly journals Noisy neighbors and reticent residents: Distinguishing resident from non-resident individuals to improve passive acoustic monitoring

2021 ◽  
pp. e01710
Author(s):  
Dana S. Reid ◽  
Connor M. Wood ◽  
Sheila A. Whitmore ◽  
William J. Berigan ◽  
John J. Keane ◽  
...  
Keyword(s):  
Acoustic Monitoring ◽  
Passive Acoustic Monitoring ◽  
Passive Acoustic

PASSIVE ACOUSTIC MONITORING OF SEABED GAS SEEPS-APPLICATION OF BEAMFORMING TECHNIQUES

2020 ◽  
Author(s):  
J Li ◽  
P R White ◽  
J M Bull ◽  
T G Leighton ◽  
B Roche ◽  
...  
Keyword(s):  
Acoustic Monitoring ◽  
Passive Acoustic Monitoring ◽  
Passive Acoustic ◽  
Gas Seeps
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