[MARMAM] New Publication: Reassessment of the franciscana Pontoporia blainvillei (Gervais & d'Orbigny, 1844) distribution and niche characteristics in Brazil

Karina Amaral karinabohrerdoamaral at gmail.com
Mon Aug 27 12:36:37 PDT 2018

Dear MARMAM readers,

My co-authors and I are pleased to announce a new publication in
the Journal of Experimental Marine Biology and Ecology:

Do Amaral, Karina Bohrer; Danilewicz, Daniel; Zerbini, Alexandre; Di
Beneditto, Ana Paula; Andriolo, Artur; Alvares, Diego Janish; Secchi,
Eduardo; Ferreira, Emanuel; Sucunza, Federico; Borges-Martins, Márcio;
Santos, Marcos César de O.; Cremer, Marta; Denuncio, Pablo; Ott, Paulo
Henrique; Moreno, Ignacio. Reassessment of the franciscana *Pontoporia
blainvillei *(Gervais & d'Orbigny, 1844) distribution and niche
characteristics in Brazil. Journal of Experimental Marine Biology and
Ecology, v. 508, p. 1-12, 2018. Doi:

Abstract: The franciscana (*Pontoporia blainvillei*) is the most threatened
small cetacean of South America. The species is endemic to coastal waters
of the western South Atlantic Ocean, where it is distributed from Itaúnas
(Brazil) to Golfo San Matias (Argentina). Its range was divided in four
Franciscana Management Areas (FMAs) for conservation purposes. However, the
distribution of the franciscana is not continuous along its range, with two
hiatuses proposed in southeastern Brazilian coast. The absence of
franciscana records in these regions has been confirmed by multiple years of
research, however the reasons for this discontinuous distribution is not
well understood. In this study, information on the distribution of the
franciscana in south and southeastern Brazil is updated and new limits for
FMAs are proposed. NicheA 3.0 software was used to investigate the
environmental suitability of distributional gaps in relation to four weakly
correlated, allegedly relevant descriptors of franciscana's distribution.
In total, 788 records from dedicated aerial and boat surveys and bycatch
were used to verify and to confirm the new FMAs limits proposed by
franciscana's experts previously. The distributional gaps were reshaped and
defined as following: Gap I from Piraquê-Açu River Mouth, Santa Cruz
(19°57′S) in the state of Espírito Santo to Barra de Itabapoana (21°18′S)
in the state of Rio de Janeiro; and Gap II from Armação dos Búzios
(22°44′S) to Piraquara de Dentro (22°59 ′S) in Rio de Janeiro. The
ecological niche model indicated that distributional gaps are inside
franciscana's fundamental niche, and are relatively suitable in terms of
salinity, temperature, diffuse attenuation and bathymetry. However, the
narrow of continental shelf seems to be the main factor explaining the
absence of franciscanas in the distributional gaps as well as for the
differentiation of some of the FMAs proposed. Narrowness of continental
shelf seems to be intensifying the dynamics of biotic inter-actions
promoting food competition for example, and/or causing geographic
limitation to maintain minimal viable population size in present or past
times periods.

Please, send an email to karinabohrerdoamaral at gmail.com to request a full

Best regards,

*Karina Bohrer do Amaral*
Doutora em Biologia Animal

Currículo Lattes: http://lattes.cnpq.br/1366481119780531
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