[MARMAM] Identifying suitable areas for common bottlenose dolphin in anthropized waters

Guilherme Maricato guilherme.713 at gmail.com
Thu Aug 11 17:12:56 PDT 2022

Dear colleagues,

On behalf of my co-authors, I would like to share our new paper published
in Marine Biology. Please feel free to contact me if you have any questions
(guilherme.713 at gmail.com).

Title: Identifying suitable areas for common bottlenose dolphin in
anthropized waters

Authors: Guilherme Maricato, Rodrigo Tardin, Liliane Lodi, Leonardo L.
Wedekin, Fábio G. Daura-Jorge, Israel Maciel, Tatiana F. Maria and Maria
Alice S. Alves

Abstract: Understanding the processes that determine the occurrence of
species, especially for those exposed to human activities, is key to
appropriate management. The common bottlenose dolphin, *Tursiops truncatus*,
is well studied worldwide, but very little attention has been given to
transient groups of this species and how such groups are exposed to human
activities. Here, we modeled and mapped how the environment and human
activities drive bottlenose dolphin habitat suitability, and residence
patterns in an anthropized area of the Southwestern Atlantic Ocean. To
predict habitat suitability, we ran 300 distribution models, including six
algorithms, and generated an ensemble model. In parallel, we used
photo-identification techniques to investigate dolphins' residence
patterns. Our results demonstrated that primary productivity, seabed slope
and port activities explained dolphins’ habitat suitability. The most
suitable areas included coastal waters, nearby port complexes and shipping
routes. We also identified a low degree of residence in Cabo Frio and Rio
de Janeiro city waters, but calves were constantly sighted there,
indicating an important area for caring and nursing. The high overlap
between the dolphins’ most suitable areas and human activities, such as
ports, vessel traffic and fisheries spots, plus the presence of calves in
these areas, highlights the need for safeguard measurements to protect
these animals from anthropogenic threats. Our results can be used to
support management decisions, such as fisheries regulations and the
creation of new marine protected areas to conserve critical habitats for
this species.

Kind regards,

*Guilherme Maricato*
*Ph.D. Candidate in Ecology and Evolution (Rio de Janeiro State University)*
Marine Ecology and Conservation Lab (Facebook
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