[MARMAM] new paper on the use of area of Guiana dolphins

Marcos Santos sotalia at gmail.com
Sat Apr 23 07:15:47 PDT 2016

Dear Marmamers: The following paper on the use of area of Guiana dolphins
(Sotalia guianensis) has recently been published: Oshima, J. E. de F. &
Santos, M. C. de O. 2016. Guiana dolphin home range analysis based on 11
years of photo-identification research in a tropical estuary. Journal of
Mammalogy, 97(2): 599-610.

Abstract: Home range studies provide significant insights on social
organization and interactions, limiting resources and habitat use.
Knowledge on home range and habitat use by Guiana dolphins, *Sotalia
guianensis*, is still scarce. The aim of this study was to identify and
analyze individual’s home ranges of Guiana dolphins in the Cananeia Estuary
(~25o03S, 47o55W), located in southeastern Brazil. Photo-identification
efforts were conducted between 2000 and 2010. From a total of 135,918
pictures taken, 34,086 (25%) were useful for individual identification.
Two- hundred and five individuals were cataloged based on permanent notches
along dorsal fin borders. Of the cataloged individuals, 31 had been
identified a minimum of 20 times, on distinct dates, prior to this
analysis. Home ranges were estimated for these individuals using 4 methods:
minimum convex polygon (MCP), adaptive kernel with least-squares
cross-validation (AKLSCV), fixed kernel with reference bandwidth (FKHREF),
and fixed kernel with least-squares cross-validation (FKLSCV). The sizes of
the estimated home ranges varied between 2.2 and 43.8 km2 (*X *= 17.5 km2)
with MCP, between 0.8 and 82.5 km2 (*X *= 15.6 km2) with AKLSCV, between
3.9 and 244 km2 (*X *= 72.4 km2) with FKHREF, and from 0.6 to 70.6 km2 (*X *=
13.5 km2) with FKLSCV. Significant differences in size and shape of the
generated areas were detected when comparing the 4 tested methods.
Variation of individual’s home range sizes and an extensive overlap among
home ranges of different Guiana dolphins in the Cananeia Estuary provide
evidence that the region supports important resources for this species.
Therefore, preventing habitat loss in this region is essential to
guaranteeing the persistence of this population.

You may download the complete PDF file here:

Dr. Marcos César de Oliveira Santos
rio de Biologia da Conserva
o de Mam
feros Aqu
ticos (LABCMA)
Departamento de Oceanografia Biol
Instituto Oceanogr
fico, Universidade de S
o Paulo
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