Biogeographic and species richness patterns of gastropoda on the Southwestern Atlantic
FLOETER, S.R.1 and SOARES-GOMES, A.2
1 Departamento de Ecologia e Recursos Naturais, Universidade Federal do Espírito Santo,
Av. Fernando Ferrari S/N, CEP 29060-900, Vitória , ES, Brazil
2 Programa de Pós-Graduação em Biologia Marinha, Universidade Federal Fluminense, C.P. 100.644,
CEP 24001-970, Niterói, RJ, Brazil
Correspondence to: Sergio R. Floeter, Cond. Village, Ed. Degas, 204, Ilha do Boi, CEP 29052-730, Vitória, ES,
Brazil, e-mail: [email protected].com.br
Received September 10, 1998 – Accepted November 17, 1998 – Distributed December 22, 1999
Patterns of richness and biogeography of Gastropoda molluscs were determined based on lists of species from five sites along the southwestern Atlantic. The analysis of the distribution patterns of these sites confirmed the existence of a broader transition zone between southern Espírito Santo State (21°S) and Rio Grande do Sul State (32°S). This zone is very heterogeneous, presenting a low endemism rate and a significant number of species common to the near provinces, and does not show enough consistency to be considered as an independent biogeographic province as proposed by Palacio (1980). Observing the distribution of species along the southwestern Atlantic we find an increase in the proportion of species with greatest latitudinal ranges (occurring from the tropics to Patagonia) from lowest to highest latitudes, following Rappoport's rule.
Key words: biogeography, Gastropoda, southwestern Atlantic, diversity.
Rev. Bras. Biol. vol.59 no.4 São Carlos Nov. 1999. Open Access Article.