Salinity Tolerance of an Isolate of Saprolegnia australis

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Abstract
The pure-culture asexual response and the tolerance of spores to constant and fluctuating salinities of a North Carolina (USA) estuary isolate are described. Under natural conditions, this fungus apparently can produce sporangia in high-tide salinities as great as 12.0 ppt if the corresponding low-tide salinity at the same location drops to 3 ppt or below. The experiment on spore tolerance to nonfluctuating conditions suggests that mortality is roughly proportional to culture-water salinity. Given a constant source of inoculum from terrestrial sources or feeder streams, S. australis may have established itself as an ecologically active invader of mesohaline estuarine waters in southeastern North Carolina.

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