Vol 8 Num 3




Snake assemblage of Ilha de São Sebastião, southeastern Brazil: comparison to mainland

Fernanda C. Centeno

Instituto Butantan
Laboratório Especial de Ecologia e Evolução, Instituto Butantan. Doutor Vital Brazil avenue, 1500. C.E.P. 05503-900 São Paulo, São Paulo, Brazil.
email: fccenteno@yahoo.com.br

Ricardo J. Sawaya

Instituto Butantan
Laboratório Especial de Ecologia e Evolução, Instituto Butantan. Doutor Vital Brazil avenue, 1500. C.E.P. 05503-900 São Paulo, São Paulo, Brazil.
Otavio A. V. Marques

Instituto Butantan
Laboratório Especial de Ecologia e Evolução, Instituto Butantan. Doutor Vital Brazil avenue, 1500. C.E.P. 05503-900 São Paulo, São Paulo, Brazil.

keywords
snakes, island, diversity, richness, dominance, Atlantic Forest.

publication date: 07-07-2008





Abstract
We provide a checklist of snake species from Ilha de São Sebastião (Ilhabela), the largest coastal island in Brazil located on the north coast of São Paulo state. We also compare snake diversity (including richness and relative abundance of species) of Ilhabela and the nearest mainland municipality, São Sebastião. We obtained the data in the herpetological collections of the Instituto Butantan and Museu de Zoologia of Universidade de São Paulo, including records from 1983 to 2002. We recorded twenty snake species from Ilhabela (N = 376 individuals), and the dominant species was the viperid Bothrops  jararaca  with 55% of dominance. In São Sebastião we recorded 27 species (N = 625), and Bothrops  jararaca  was also the dominant species, but with 25% of dominance. Some common species seem to be more abundant in the mainland. Even considering the different number of individuals sampled between localities, rarefactions curves and richness estimations confirm that São Sebastião should present a higher number of species. The Chao 1 estimates 20 species (19 to 21 spp.) for Ilhabela, and 32 species (27 to 37 spp.) for São Sebastião. One of the most distinctive aspects of the snake fauna of Ilhabela is the occurrence of four species of the genus Dipsas  (Dipsas . albifrons , Dipsas  alternans , Dipsas  neivai , and Dipsas  petersi ). Throughout most of the coastal Atlantic Forest of São Paulo state only Dipsas  petersi  is recorded. This is the first assessment of diversity of snakes in Ilha de São Sebastião and the municipality of São Sebastião. Thus, it is a contribution to the knowledgement and conservation of the herpetofauna of the region and of the Atlantic Forest of southeastern Brazil.

how to quote this paper
Centeno, F.C., Sawaya, R. J. and Marques, O.A.V. Snake assemblage of Ilha de São Sebastião, southeastern Brazil: comparison to mainland.Biota Neotrop.  Jul/Sep 2008 vol. 8, no. 3 http://www.biotaneotropica.org.br/v8n3/en/abstract?article+bn00608032008 ISSN 1676-0603.

Cited species
check for this species in other resources Bothrops  jararaca 
check for this species in other resources Bothrops  jararaca 
check for this species in other resources Dipsas  albifrons 
check for this species in other resources Dipsas  alternans 
check for this species in other resources Dipsas  neivai 
check for this species in other resources Dipsas  petersi 



Fundação de Amparo à Pesquisa do Estado de São Paulo, Fapesp
Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq
© BIOTA NEOTROPICA, 2008