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Revista Brasileira de Zoologia

Print version ISSN 0101-8175

Rev. Bras. Zool. vol.19 no.3 Curitiba Sept. 2002

http://dx.doi.org/10.1590/S0101-81752002000300026 

Heterogeneidade de habitats: rasos x fundos em assembléias de peixes de igarapés de terra firme na Amazônia Central, Brasil

 

Habitat heterogeneity: riffles x pools on fish assemblages of Central Amazonian rainforest streams

 

 

Cristina Motta Bührnheim

Laboratório de Zoologia, Departamento de Biologia, Universidade do Amazonas. Avenida Rodrigo Otávio Jordão Ramos 3000, Aleixo, 69077-000 Manaus, Amazonas, Brasil. E-mail: cmbuhrn@yahoo.com.br

 

 


ABSTRACT

Assemblage structure is related to predictable patterns of species composition, richness, and abundance. Stream habitat heterogeneity can be approached by two markedly hydrological sorts, riffles and pools, mainly featured by current, depth and substrate. Riffle and pool effect was studied on fish assemblages of three headwater terra firme rainforest streams in Urubu River basin. Central Amazonia, by 30-minute diurnal bank-side observational sampling intervals in which specimens were identified and counted. Twenty four habitats were chosen, eigth by stream, four riffles and four pools, for sampling in four trimestral periods in 1996 and 1997. The observations resulted in 754 specimens of 19 species. The most abundant species were: Pyrrhulina brevis Steindachner, 1975, Hemigrammus gr. ocellifer, Hyphessobrycon aff. melazonatus Durbin in Eigenmann, 1908, Hyphessobrycon aff. heterorhabdus (Ulrey, 1864), Iguanodectes variants Géry, 1993, Nannostomus marginatus Eigenmann, 1909. and Aequidens pallidus (Heckel. 1840). Riffles comprised 215 specimens of 15 species, and pools 537 specimens of 17 species. Segregation of assemblages through riffles and pools was explained by a trend of greater species richness and abundance in pools. This pattern might be related to several factors such as higher resource availability and inactivity of nocturnal predator in pools.

Key words: Amazonia, fish assemblage structure, riffles and pools, species richness, composition, and abundance, bank-side observational sampling


 

 

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

 

 

AGRADECIMENTOS. O estudo foi financiado pelo Projeto Dinâmica Biológica de Fragmentos Florestais (PDBFF) do convênio Instituto Nacional de Pesquisas da Amazônia (INPA) e Smithsonian Institution (SI), em áreas de reservas cedidas pela SUFRAMA. Agradeço os assistentes de campo do PDBFF no acompanhamento das atividades e os referees Virgínia Sanches Uieda e outro anônimo pelas sugestões e correções. Contribuição nº 392 na série técnica do PDBFF.

 

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Recebido em 21.IX.2001; aceito em 04.IX.2002.

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