[MARMAM] New publication: Manatee genetic in Mexico

Coralie nourisson coralie.nourisson at gmail.com
Mon Jun 20 11:59:48 PDT 2011

Dear Marmam subscribers,



We are pleased to announce that our following paper has just been published
online in Genetica: 


Evidence of two genetic clusters of manatees with low genetic diversity in
Mexico and implications for their conservation. 

Coralie Nourisson, Benjamín Morales-Vela, Janneth Padilla-Saldívar, Kimberly
Pause Tucker, AnnMarie Clark, Leon David Olivera-Gómez, Robert Bonde and
Peter McGuire. 

DOI: 10.1007/s10709-011-9583-z





The Antillean manatee (Trichechus manatus manatus) occupies the tropical
coastal waters of the Greater Antilles and Caribbean, extending from Mexico
along Central and South America to Brazil. Historically, manatees were
abundant in Mexico, but hunting during the pre-Columbian period, the Spanish
colonization and throughout the history of Mexico, has resulted in the
significantly reduced population occupying Mexico today. The genetic
structure, using microsatellites, shows the presence of two populations in
Mexico: the Gulf of Mexico (GMx) and Chetumal Bay (ChB) on the Caribbean
coast, with a zone of admixture in between. Both populations show low
genetic diversity (GMx: NA = 2.69; HE = 0.41 and ChB: NA = 3.0; HE = 0.46).
The lower genetic diversity found in the GMx, the largest manatee population
in Mexico, is probably due to a combination of a founder effect, as this is
the northern range of the sub-species of T. m. manatus, and a bottleneck
event. The greater genetic diversity observed along the Caribbean coast,
which also has the smallest estimated number of individuals, is possibly due
to manatees that come from the GMx and Belize. There is evidence to support
limited or unidirectional gene flow between these two important areas. The
analyses presented here also suggest minimal evidence of a handful of
individual migrants possibly between Florida and Mexico. To address
management issues we suggest considering two distinct genetic populations in
Mexico, one along the Caribbean coast and one in the riverine systems
connected to the GMx.



For subscribers, it can be downloaded from:




Please feel free to contact me for questions or for a copy of the pdf. (
<mailto:coralie.nourisson at gmail.com> coralie.nourisson at gmail.com)


Best regards,




Coralie Nourisson
ECOSUR - Proyecto manati
Av Centenario Km 5.5
Chetumal Q.Roo 77900 Mexico
 <mailto:coralie.nourisson at gmail.com> coralie.nourisson at gmail.com

 <http://www.geomare.org> www.geomare.org


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