No abstract

Feeding habits of nymphs of the predatory mayfly Dolania americana Edmunds & Traver in northwestern Florida were examined during 1971 and 1972 . Larvae of Chironomidae (Diptera) formed the bulk of prey items . The size of the predaceous D . americana nymphs was correlated with the size of chironomid prey taken. Differential microhabit utilization allows partition of prey resources with the other major predator species present. The relationship between predator and prey biomass throughout the year is discussed .

The external thoracic morphology of the nymphs and imagos and the thoracic muscles of the imagos of Leptophlebia pacifica are described. Descriptions of the imaginal thoracic exoskeleton are given for five other genera of the Leptophlebiidae. A comparison of homologous structures in the imaginal thoraces of these genera and the use of these structures in understanding the taxonomy and phylogeny of the family are discussed.

Aquatic environmental impact associated with stream-crossing by a pipeline was monitored at Archibald Creek, B.C. for two years. Water chemistry and benthic macroinvertebrates were used as monitoring tools. Results indicated that impacts arising from stream-crossing were short-term and non-residual.

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