Resumo

RODRIGUEZ-BARRIOS, JAVIER; OSPINA-TORRES, RODULFO; GUTIERREZ, JUAN DAVID  e  OVALLE, HERNANDO. Density and biomass of drifting aquatic macroinvertebrates in a tropical mountain creek at Bogotá, Colombia. Caldasia [online]. 2007, vol.29, n.2, pp.397-412. ISSN 0366-5232.

The variation of drift density of aquatic macroinvertebrates and biomass contribution of different immature and imagos stages were estimate on a stream segment of a first order tropical stream in Eastern hills of Bogotá - Colombia, during high and low rainfall periods. A total of 96 taxa were collected; Simulium was the most abundant with 194 individuals (total abundance). Drift density and biomass contributions, were greater during the dry period. Dipterans (chironomids) and mites showed the mayor drift density; trichopterans (Triplectides) showed the greater biomasses to the drift. Significant differences in diel drift pattern between the day and the night (K-S=1.86, p=0.002, n=185), but not in biomass contribution in drift, were observed.

Palavras-chave : Macroinvertebrates; drift; Biomass; tropical mountain stream.

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