Abstract
The species richness and abundance of macroinvertebrates were assessed in two adjacent similar streams, the Nabukavesi and Wainikovu creeks (Viti Levu, Fiji) at intervals of 2 months for 3 years. Previous logging of rain forest in the Nabukavesi catchment had subjected it to suspended sediment loads and to sediment and grit deposition on its substrate, In contrast the forest in the Wainikovu catchment had not been logged. Species richness was significantly higher (11–18 species; total 38 spp.) in the unlogged Wainikovu Creek than in the Nabukavesi Creek (eight to 15 species; total 34 spp.) over the 3-year period. Diversity indices confirmed greater species diversity in the Wainikovu creek. The total abundance of invertebrates varied considerably within streams, but not significantly between them over 3 years. The most abundant species in both streams were the caddis fly, Abacaria fijiana, mayflies, Cloeon spp. and Pseudocloeon sp. and atyid shrimps, Caridina spp.
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