Distribution pattern of two fish species in a coastal stream in Southeast Brazil
Braz. j. biol
; Braz. j. biol;62(1): 171-178, Feb. 2002. mapas, tab, graf
Article
em En
| LILACS
| ID: lil-321298
Biblioteca responsável:
BR1.1
ABSTRACT
Longitudinal distribution of Mimagoniates microlepis and Hoplias malabaricus was analyzed in a coastal stream system in Southeast Brazil. Six sites were sampled by electrofishing in seven months, from July 94 to July 95. Densities of M. microlepis, and H. malabaricus and its prey (Poecilia vivipara, Deuterodon sp. and Astyanax janeiroensis) were estimated by the Zippin method; environmental variables of (i) kind of substratum; (ii) percentage of pools, runs, riffles, instream vegetation, and canopy were registered for each site in each sampling month. The relative importance of each biotic and abiotic variable was tested through simple correlation analyses. We verified that M. microlepis occurrence correlates with canopy; H. malabaricus is correlated with instream vegetation, pools, clay substratum, and P. vivipara densities; and P. vivipara correlates with pools and clay substratum. Our results suggest that environmental variables, and food and shelter availability are the main factors in determining M. microlepis and H. malabaricus distribution
Texto completo:
1
Coleções:
01-internacional
Base de dados:
LILACS
Assunto principal:
Peixes
Limite:
Animals
País/Região como assunto:
America do sul
/
Brasil
Idioma:
En
Revista:
Braz. j. biol
Assunto da revista:
BIOLOGIA
Ano de publicação:
2002
Tipo de documento:
Article
/
Project document
País de afiliação:
Brasil
País de publicação:
Brasil