Life Histories of Some Ephemeroptera from Victoria, Australia

Abstract

Three species of Australian mayflies, Austrophlebioides sp., Nousia sp. and Baetis sp. are shown to have univoltine life histories in a subalpine stream, while detailed studies of the life history of Austrophlebioides pusillus (Harker) in a lower altitude stream failed to demonstrate a clear summer generation. The three species from the cooler site had more synchronous life histories, but the stream discharge at that site was probably less variable, so that neither temperature nor discharge can be singled out as the causal factor for synchrony.