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Changes in diatom-inferred pH and add neutralizing capacity in a dilute, high elevation, Sierra Nevada lake since A.D. 1825 |
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| Authors: | R W HOLMES M C WHITING J L STODDARD |
| Institution: | Department of Biological Sciences, University of California, Santa Barbara, CA 93105.;Department of Biology, Jordan Hall 138, Indiana University, Bloomington, IN 47405, and;New York City Department of Environmental Protection, P.O. Box 184, Valhalla, N.Y. 10595 |
| Abstract: | SUMMARY. 1. We developed equations which describe relationships between the relative abundance of diatom assemblages in the surface sediments of twenty-seven Sierra Nevada lakes and the present pH and acid neutralizing capacity in these lakes. 2. These equations were employed to reconstruct pH and acid neutralizing capacity at twenty-four depth intervals in a 20 cm long sediment core from Emerald Lake, a dilute, high elevation lake, located in Sequoia National Park, California, U.S.A. 3. The diatom-inferred pH and acid neutralizing capacity values indicated that neither pH nor acid neutralizing capacity exhibited significant trends since about A.D. 1825. We conclude from our diatom analysis that Emerald Lake has not been affected by acidic deposition. |
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