[MARMAM] New publication: Potential distribution of Guiana dolphin (Sotalia guianensis): a coastal-estuarine and tropical habitat specialist (Aline de Jesus Lobo)

Aline Lobo alinejlobo at gmail.com
Wed Mar 3 07:50:01 PST 2021

Dear colleagues,

My colleagues and I are pleased to announce the publication of our article:

Lobo, A. J.; Wedekin, L. L.; Sobral-Souza, T. and Le Pendu, Y. Potential
distribution of Guiana dolphin (*Sotalia guianensis*): a coastal-estuarine
and tropical habitat specialist.

Published: 18 February 2021, Journal of mammalogy.


Ecological niche models (ENMs) predict where species can occur in
accordance with environmental factors. Suitability maps are generated
through models to identify habitats more or less adapted to the species.
Published works on the distribution and habitat use of Guiana dolphin, *Sotalia
guianensis*, are limited to fine spatial scales. Here, we aimed to predict
the potential geographical distribution of Guiana dolphins through ENMs and
generate a map of suitable habitats for the species. Data were collected
between 1997 and 2015 in Brazil, French Guiana, and Colombia. The
environmental data were obtained from MARSPEC database with a cell
resolution of 10 × 10 km. For modeling, 99 of the 859 initial occurrence
points of the species were considered after rarefaction. Seven
environmental variables were selected through factorial analysis:
bathymetry, distance to shore, bathymetric slope, sea surface salinity
(minimum monthly and annual range), and sea surface temperature (mean
annual and annual range). Results from five distinct algorithms were
assembled to generate the distribution model. Our findings show potential
areas in shallow platforms of the continental margin of South and Central
America, including regions where the species has never been reported, such
as the Pacific Ocean, the Gulf of California, the Gulf of Mexico, and the
oceanic islands in the Caribbean Sea. The absence of Guiana dolphins in
these regions may be due to geographical (linking of North and South
America), physical (water temperature), and biological (competition,
limited ability to dispersal) limiting factors. The models suggest that the
presence of other species of coastal dolphin may be an important limiting
factor for the Guiana dolphin at both extremes of its distribution. The
Guiana dolphin is habitat specialist with a clinal potential geographic
distribution concentrated in tropical and subtropical shallow and coastal
waters of the continental shelf of the western Atlantic Ocean. This more
restricted distribution than reported by IUCN and other studies suggests a
cautionary approach to its conservation status due to limited dispersal
abilities and high overlap with human activities.

Please feel free to contact me if you need a copy: *alinejlobo at gmail.com

Best regards,

MSc Aline de Jesus Lobo

MSc Aline de Jesus Lobo

Bióloga - CRBio 116115/01-D

Marine Mammal Observer - MMO/JNCC

Protect Species Observer - PSO

Lattes: http://lattes.cnpq.br/4363911144586456
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