Signature information and individual recognition in the isolation calls of Amazonian manatees, Trichechus inunguis (Mammalia: Sirenia)

摘要: Acoustic signals are assumed to form the basis of manatee communication. Empirical evidence individual vocal recognition has been reported. If manatees can recognize one another by acoustical means, it should be possible identify patterns. We recorded vocalizations 14 individually housed Amazonian and then digitized selected vocalizations, allowing seven variables measured subjected multivariate statistical treatment. Discriminant function analysis indicated that individuals separated on related fundamental frequency signal duration. observed significant differences in patterns between sexes age classes. Females tended have greater shorter note duration than males. Calves had durations values for range subadults adults. An inverse relationship total body length suggests becomes more defined as animal ages. The similar a mother calf pair discussed. Individual according their is suggested through preliminary playback experiment.