Abstract
The dynamics of metazooplankton populations were studied over 3 years at the saline (43 g 1−1) Salton Sea, California’s largest lake. Total abundance was highest in summer following late winter/early spring phytoplankton blooms. At this time, metazooplankton consisted mostly of the copepod, Apocyclops dengizicus,and the rotifer, Brachionus rotundiformis. In August or September, severe crashes in the metazooplankton populations occurred each year in mid-lake due to strong wind events which increased mixing and caused low oxygen and high sulfide concentrations throughout the water column. Larvae of the polychaete worm, Neanthes succinea and the barnacle, Bat nus amphitrite were present mostly in late winter and spring. Their scarcity in summer is due in part to persistent anoxic bottom conditions that decrease adult populations and in part to predation by tilapia, an omnivorous fish that has become abundant in the lake since the 1960s. Two Synchaeta species, rotifers not previously reported front the Sea, were abundant in winter and spring and predation on these may have permitted the copepod to persist at low levels through the winter. There were two major changes in metazooplankton dynamics since 1954–1956 in addition to the appearance of the two synchaetid rotifers in the fauna. First, there are now much lower densities of barnacle and polychaete larvae in the fall, probably due to the invasion of the zooplanktivorous fish, tilapia. Second the precipitous crashes now seen in metazooplankton densities, especially the copepod, in late summer-early fall did not occur in the 1950s possibly because fall overturn events did not result in such high sulfide levels.
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Tiffany, M.A., Swan, B.K., Watts, J.M., Hurlbert, S.H. (2002). Metazooplankton dynamics in the Salton Sea, California, 1997–1999. In: Barnum, D.A., Elder, J.F., Stephens, D., Friend, M. (eds) The Salton Sea. Developments in Hydrobiology, vol 161. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-3459-2_8
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