[MARMAM] New publication: ocial structure of Lahille's bottlenose dolphin Tursiops truncatus gephyreus (Cetacea: Delphinidae) off the uruguayan marine coast.

Carolina Menchaca cmenchaca at fcien.edu.uy
Wed Sep 25 22:15:00 PDT 2019


Dear MARMAMers,

We are pleased to announce the following publication in Mastozoología
Neotropical:

Social structure of Lahille's bottlenose dolphin Tursiops truncatus
gephyreus (Cetacea: Delphinidae) off the uruguayan marine coast.

Carolina Menchaca, Paula Laporta and Bettina Tassino.

Abstract:  Information about the social relations among individuals is
essential to define and develop management plans for a socially structured
population. Association data for 25 adult Lahille's bottlenose dolphins
were obtained from 189 photo-identification surveys that took place between
January 2007 and May 2009 in La Coronilla-Cerro Verde and Cabo Polonio,
Rocha, Uruguay. Group size averaged 5.22 individuals (SD= 3.77, n= 255).
Coefficients of association were calculated using the Half-Weight Index.
Most of the associations were weak (79.7%) and variation of real
association indices was greater than would be expected by chance. Thus, the
null hypothesis that individuals associated randomly was rejected.
Standardized Lagged Association Rate analysis also indicated that nonrandom
associations between individuals persisted over the study period. The
exponential decay model that fits best to the data suggested the existence
of constant companions and casual acquaintances. This study is the first
report about the social structure of the population of Lahille’s bottlenose
dolphin inhabiting the Uruguayan marine coasts. Cerro Verde and Cabo
Polonio were the first marine protected areas selected by the government of
Uruguay. However, information about the ecology and behavior of the species
in these areas is still insufficient. It is recommended that the results of
this study be taken as baseline information to assess the conservation
status of this population, as well as for the development of adequate
conservation and management plans.

The paper is available with open access at:
https://doi.org/10.31687/saremMN.19.26.2.0.15

Kind regards,

Carolina Menchaca


-- 
MSc. Carolina Menchaca

Magíster en Ciencias Biológicas, opción Ecología y Evolución.
Investigador asociado
Asociación Civil Yaqu Pacha Uruguay
Punta del Diablo, Rocha, Uruguay.


-- 
MSc. Carolina Menchaca

Magíster en Ciencias Biológicas, opción Ecología y Evolución.
Investigador asociado
Asociación Civil Yaqu Pacha Uruguay
Punta del Diablo, Rocha, Uruguay.
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