[MARMAM] New Article: Population Genetics of Franciscana Dolphins (Pontoporia blainvillei): Introducing a New Population from the Southern Edge of Their Distribution

Lic. Maria Constanza Gariboldi gariboldi.constanza at maimonides.edu
Mon Aug 24 18:32:31 PDT 2015

Dear Colleagues,

We would like to announce the recent publication:

Gariboldi MC, Túnez JI, Dejean CB, Failla M, Vitullo AD, Negri MF, Cappozzo
HL. 2015. Population Genetics of Franciscana Dolphins (*Pontoporia
blainvillei*): Introducing a New Population from the Southern Edge of Their
Distribution. PLoS ONE 10(7):e0132854. doi:10.1371/journal.pone.0132854.

Due to anthropogenic factors, the franciscana dolphin, *Pontoporia
blainvillei*, is the most threatened small cetacean on the Atlantic coast
of South America. Four Franciscana Management Areas have been proposed:
Espiritu Santo to Rio de Janeiro (FMA I), São Paulo to Santa Catarina (FMA
II), Rio Grande do Sul to Uruguay (FMA III), and Argentina (FMA IV).
Further genetic studies distinguished additional populations within these
FMAs. We analyzed the population structure, phylogeography, and demographic
history in the southernmost portion of the species range. From the analysis
of mitochondrial DNA control region sequences, 5 novel haplotypes were
found, totalizing 60 haplotypes for the entire distribution range. The
haplotype network did not show an apparent phylogeographical signal for the
southern FMAs. Two populations were identified: Monte Hermoso (MH) and
Necochea (NC)+Claromecó (CL)+Río Negro (RN). The low levels of genetic
variability, the relative constant size over time, and the low levels of
gene flow may indicate that MH has been colonized by a few maternal
lineages and became isolated from geographically close populations. The
apparent increase in NC+CL+RN size would be consistent with the higher
genetic variability found, since genetic diversity is generally higher in
older and expanding populations. Additionally, RN may have experienced a
recent split from CL and NC; current high levels of gene flow may be
occurring between the latter ones. FMA IV would comprise four franciscana
dolphin populations: Samborombón West+Samborombón South, Cabo San
Antonio+Buenos Aires East, NC+CL+Buenos Aires Southwest+RN and MH. Results
achieved in this study need to be taken into account in order to ensure the
long-term survival of the species.

The article can be downloaded from:


Kind regards,


Lic. María Constanza Gariboldi
Centro de Estudios Biomédicos, Biotecnológicos, Ambientales y Diagnóstico -
Universidad Maimónides
Hidalgo 775 6to piso (1405)
Tel: 4905 1197
Fax: 4905 1133
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