[MARMAM] New publication on manatee vocalizations

Eric Angel Ramos eric.angel.ramos at gmail.com
Mon Jul 10 08:21:40 PDT 2023

Greetings MARMAM,

On behalf of my coauthors, I am pleased to share our newest open access
publication in *Scientific Reports* titled: *Vocalizations of wild West
Indian manatee vary across subspecies and geographic location.*

*Reyes-Arias, J.D., Brady, B., Ramos, E.A. et al. Vocalizations of wild
West Indian manatee vary across subspecies and geographic location. Sci Rep
13, 11028 (2023). https://doi.org/10.1038/s41598-023-37882-8
<https://doi.org/10.1038/s41598-023-37882-8> *

Geographic variation in the vocal behavior of manatees has been reported
but is largely unexplored. Vocalizations of wild West Indian manatees
(Trichechus manatus) were recorded with hydrophones in Florida from Florida
manatees (Trichechus manatus latirostris), and in Belize and Panama from
Antillean manatees (Trichechus manatus manatus) to determine if calls
varied between subspecies and geographic regions. Calls were visually
classified into five categories: squeaks, high squeaks, squeals,
squeak-squeals, and chirps. From these five categories, only three call
types (squeaks, high squeaks and squeals) were observed in all three
populations. Six parameters from the temporal and frequency domains were
measured from the fundamental frequency of 2878 manatee vocalizations. A
repeated measures PERMANOVA found significant differences for squeaks and
high squeaks between each geographic location and for squeals between
Belize and Florida. Almost all measured frequency and temporal parameters
of manatee vocalizations differed between and within subspecies. Variables
that may have influenced the variation observed may be related to sex, body
size, habitat and/or other factors. Our findings provide critical
information of manatee calls for wildlife monitoring and highlight the need
for further study of the vocal behavior of manatees throughout their range.

The article can be downloaded free here:


If you have any questions, please contact corresponding author Nataly
Castelblanco-Martinez: castelblanco.nataly at gmail.com

Best regards,

*Eric Angel Ramos, Ph.D.*
Postdoctoral Research Associate at The University of Vermont
Scientist at FINS (Fundación Internacional para la Naturaleza y la

Member of the IUCN SSC Sirenian Specialist Group for Mesoamerica

www.finsconservation.org <https://finsconservation.org/>
E-mail: eric.angel.ramos at gmail.com
Facebook <https://www.facebook.com/ericangelramos> | Twitter
<https://twitter.com/EricAngelRamos> | Instagram
ResearchGate <https://www.researchgate.net/profile/Eric_Ramos> | ORCiD
<https://orcid.org/0000-0003-4803-3170> | LinkedIn
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