Amostragem

ESTUDO COMPARATIVO DE MÉTODOS DE AMOSTRAGEM DE COMUNIDADES DE COSTÃO

407

ESTUDO COMPARATIVO DE MÉTODOS DE
AMOSTRAGEM DE COMUNIDADES DE COSTÃO
SABINO, C. M.1 e VILLAÇA, R.2
1

Mestranda da Universidade Federal Fluminense, Programa de Pós-graduação em Biologia Marinha

2

Universidade Federal Fluminense, Programa de Pós-graduação em Biologia Marinha, C.P. 100436,
CEP 24001-970, Niterói, RJ, Brasil

Correspondência para: Roberto Villaça, Universidade Federal Fluminense, Programa de Pós-graduação em Biologia Marinha, C.P. 100436, CEP 24001-970, Niterói, RJ, Brasil, e-mail: [e-mail]
Recebido em 22/04/98 – Aceito em 11/09/98 – Distribuído em 10/09/99

(Com 8 figuras)
ABSTRACT
Sampling methods for rocky shores
This study compares three sampling methodologies of rocky shore communities: visual estimation, point intercept quadrats and destructive sampling. Visual estimation was performed in two sizes of sampling device and, point intercept quadrats was done with different numbers of marked dots. The sampling took place on the rocky shore of Forno beach, Búzios, RJ, in two different algae belts; one whose the landscape is characterized by Amphiroa sp., the other, Sargassum furcatum was the most conspicuous species. The data were analyzed by ANOVA and Kruskal-Wallis tests. Number of species, total percent cover, diversity and evenness indices were the variables used. The results shown that in general the methods compared were not statistically different one from the other in this community.
There were significative differences between the methods when comparison was made between nondestructive and destructive sampling. However, smaller areas of sampling devices and fewer intercept points decreased the sampling power in respect of sampling species richness. All of the methods studied were considered similar in concern of total cover index and of diversity and evenness indices, with some exceptions. Present data are useful only for