[MARMAM] New publication on Brazilian manatee genetic

Fabia Luna fabia.luna at icmbio.gov.br
Mon Aug 27 11:14:41 PDT 2012


Dear colleagues,****

We are pleased to announce the  publication of a paper that may be of
interest to some of you.****

Luna, F. O., Bonde, R. K., Attademo, F. L. N., Saunders, J. W.,
Meigs-Friend, G., Passavante, J. Z. O. and Hunter, M. E. (2012),
Phylogeographic implications for release of critically endangered manatee
calves rescued in Northeast Brazil. Aquatic Conserv: Mar. Freshw. Ecosyst..
doi: 10.1002/aqc.2260****



   1. The Antillean manatee (*Trichechus manatus manatus*), a subspecies of
   the West Indian manatee, is a large-bodied marine mammal found in fresh,
   brackish, and marine habitats throughout the Caribbean Islands and Central
   and South America. Antillean manatees in Brazil are classified as
   critically endangered, with a census size of approximately 500 individuals.
   The population in the Northeast region of Brazil is suspected to have
   approximately 300 manatees and is threatened by habitat alteration and
   incidental entanglement in fishing gear.****
   2. A high incidence of dependent calf strandings have been identified
   near areas of altered critical manatee habitat. The majority of the calves
   are neonates, discovered alive, with no potential mothers nearby. These
   calves typically require human intervention to survive.****
   3. Since 1989 the calves have been rescued (N=67), rehabilitated, and
   released (N=25) to supplement the small wild manatee population. The
   rescued calves, and those born in captivity, are typically, not released to
   their rescue location, mainly for logistical reasons. Therefore,
   phylogeographic analyses can help to identify related populations and
   appropriate release sites.****
   4. Here, mitochondrial DNA analyses identified low haplotype (*h*=0.08)
   and nucleotide (π=0.0026) genetic diversity in three closely related
   haplotypes. All three haplotypes (M01, M03, and a previously unidentified
   haplotype, M04) were found in the northern portion of the region, while
   only a single haplotype (M01) was represented in the south. This suggests
   the presence of two genetic groups with a central mixing zone. Release of
   rehabilitated calves to unrelated populations may result in genetic
   swamping of locally adapted alleles or genotypes, limiting the evolutionary
   potential of the population.****
   5. The small population size coupled with low genetic diversity
   indicates that the Northeast Brazil manatee population is susceptible to
   inbreeding depression and possible local extinction. Further conservation
   measures incorporating genetic information could be beneficial to the
   critically endangered Brazilian manatee population.****

** **

Please, fill free to contact me for a pdf copy or if you have any question.*

Best regards,****

M.Sc. Fábia Luna
Coordenadora do CMA/ICMBio
Analista Ambiental - ICMBio
PhD. candidate

Centro Mamíferos Aquáticos-CMA/ICMBio
Estrada do Forte Orange s/n
Ilha de Itamaracá - PE - Brasil
CEP: 53.900-000
Fone: + 55 (81) 3544-1835
E-mail: fabialunacma at gmail.com

Currículo Lattes: http://lattes.cnpq.br/8912525041395967
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