Abstract
Flow in the Bovo River is very rapid and spates are frequent. The substrate (mostly boulders) at the study site is extremely unstable. Invertebrates in c70 taxa, were collected. Gastropoda, Palaeomonidae and Atyidae were diverse and abundant and dominated the invertebrate community in terms of biomass, but an undescribed mayfly, Caenodes sp. was the most common species. The invertebrate community exhibited no pattern of seasonal change with respect to community composition or faunal abundance. The life cycles of two Ephemeroptera, Prosopistoma sedlaceki and Caenodes sp., were both asynchronous and aseasonal, with continuous hatching and growth. A wide range of energy sources was available including riparian vegetation, benthic algae, semi-submerged grasses, and organic rubbish discarded by humans. The invertebrate fauna was dominated by collector-gatherers (74%), followed by grazer-scrapers (15%), shredders (5%), collector-filterers (3%) and predators (3%). -from Author