Summary
Salinity increased from 48 to 93 g/l total dissolved solids (TDS) in Mono Lake, California between 1941 and 1982, and is expected to fluctuate between 169 and 248 g/l at equilibrium by the middle of the next century. In order to predict the consequences of this trend on the Mono Lake ecosystem, we determined effects of salinity on survival, growth, reproduction and hatching ofArtemia monica, Mono Lake's only macrozooplankton species. Seven salainities ranging from 76 to 179 g/l were tested in a long-term experiment to determine both lethal and sublethal responses. The salt tolerance limit for subadultA. monica was between 159 and 179 g/l. Adult size, growth rates, and brood sizes decreased, and female mortality during reproduction increased, as salinity increased. Hatching of diapause eggs was delayed and total percent hatch decreased as salinity increased, and hatching failed at 159 g/l. The life-time reproductive potential of individual females decreased linearly over the seven salinities tested. Based on this study, we predict a decrease in the productivity of theA. monica population in Mono Lake and extinction of the species is probable before the lake reaches equilibrium.
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Dana, G.L., Lenz, P.H. Effects of increasing salinity on anArtemia population from Mono Lake, California. Oecologia 68, 428–436 (1986). https://doi.org/10.1007/BF01036751
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DOI: https://doi.org/10.1007/BF01036751