Survivorship of (a): Paphies australis from Doubtful Sound and (b): Austrovenus stutchburyi from Doubtful Sound (dark bars) and Otago Harbour (light bars) during 70 days of exposure to fluctuating salinities (0 or 34) with a mean salinity of 17. Mean values are expressed (1 SD). Significant differences ( p < 0.05) in survivorship of clams among treatments, as determined by
parallel one-way ANOVA, are indicated by letters (Doubtful Sound) and numbers (Otago).