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Title: Local habitat use by botos (Amazon river dolphins, Inia geoffrensis) using passive acoustic methods
Authors: Yamamoto, Yukiko
Akamatsu, Tomonari
Silva, Vera Maria Ferreira da
Kohshima, Shiro
Keywords: Behavioral Ecology
Diel Variation
Foraging Behavior
Habitat Type
Habitat Use
Lacustrine Environment
Underwater Environment
Amazon River
Mamiraua Sustainable Development Reserve
Inia Geoffrensis
Issue Date: 2016
metadata.dc.publisher.journal: Marine Mammal Science
metadata.dc.relation.ispartof: Volume 32, Número 1, Pags. 220-240
Abstract: We monitored the underwater behavior of botos (Inia geoffrensis) using stereo acoustic data loggers to observe their local habitat use and its diel changes at the Mamirauá Sustainable Development Reserve, Brazil. A-tags were set at five sites in three different habitat types: Lake (low current), Channel (middle current), and Junction (junction of two channels). The presence index during nighttime was significantly greater than during daytime in the Lake and Junction. Underwater movement was estimated from the changing pattern (trajectory) of the relative angle of the sound source from A-tags. A staying-type trajectory was dominant in the Lake, although the prevalence of moving-type trajectory increased at night. More than 80% of detected trajectories were the staying type in the Junction, while moving-type trajectories dominated in the Channel. The frequency of click trains was greatest in the Lake, followed by the Junction and Channels. The average interpulse interval, which reflects the mean target distance of echolocation, was shortest in the Lake, followed by the Junction and Channel. These results suggest that the botos used the Lake as their primary habitat for active behaviors like foraging, especially at night, and the Junction as their primary habitat for relatively inactive behaviors at night. © 2016 Society for Marine Mammalogy.
metadata.dc.identifier.doi: 10.1111/mms.12252
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