Abstract
Oviposition, egg sinking rates, ion excretion in eggs and early embryos, and egg permeability and resistance to desiccation were studied in Tanytarsus barbitarsis a chironomid inhabiting highly saline waters in southern Australia. The aim was to investigate the nature of adaptations displayed by eggs and early embryonic stages of this species to life in hypersaline waters. Adaptations appear to be of two major sorts: one sort relates to the physiological stress of life in a hypersaline medium, the other to the need to minimize fish predation. The importance of selective forces other than salinity in determining the fauna of salt lakes is highlighted.
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