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manatee reprint

Subject: manatee reprint
From: Renata S. Sousa-Lima Mobley <>
Date: Tue, 26 Nov 2002 14:44:54 -0800
Dear BIOACOUSTICS-L members,<br>
 Reprints available of our paper:<br>
 Sousa-Lima, R. S., Paglia, A.P. & da Fonseca, G. A. B. 2002. Signature 
 information and individual recognition in the isolation calls of Amazonian 
 manatees, Trichechus inunguis (MAMMALIA: SIRENIA). Animal Behaviour, 63, 
 Acoustic signals are assumed to form the basis of manatee communication. 
 Empirical evidence of individual vocal recognition has been reported. If 
 manatees can recognize one another by acoustical means, it should be 
 possible to identify individual vocal patterns. We recorded vocalizations 
 of 14 individually housed Amazonian manatees and then digitized selected 
 vocalizations, allowing seven variables to be measured and subjected to 
 multivariate statistical treatment. Discriminant function analysis 
 indicates that individuals can be separated on the basis of variables 
 related to the fundamental frequency and signal duration. We observed 
 significant differences in the vocal patterns between sexes and age 
 classes. Females tend to have greater fundamental frequency and shorter 
 note duration than males. Calves had shorter note duration and greater 
 values for the fundamental frequency range than subadults and adults. An 
 inverse relationship between total body length and fundamental frequency 
 range suggests that the fundamental frequency becomes more defined as the 
 animal ages. The similar individual patterns in the vocalizations of a 
 mother and calf pair are discussed. Individual recognition by Amazonian 
 manatees according to their vocal patterns is suggested through a 
 preliminary playback experiment.<br>
 Renata S. Sousa-Lima, M. Sc.<br>
 Fernow Hall<br>
 Cornell University<br>
 Ithaca, NY<br>
 14853 USA<br>

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