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Preliminary Effects on Algal Succession Resulting from Nutrient Enrichment of Two Central Virginia Ponds with Different Trophic States

H. J. Winfrey and G. L. Samsel
Castanea
Vol. 38, No. 2 (Jun., 1973), pp. 140-152
Published by: Allen Press on behalf of the Southern Appalachian Botanical Society
Stable URL: http://www.jstor.org/stable/4032502
Page Count: 13
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preliminary Effects on Algal Succession Resulting from Nutrient Enrichment of Two Central Virginia Ponds with Different Trophic States
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Abstract

The effect of nutrient enrichment (accelerated eutrophication) on algal succession was studied in two adjacent, morphologically similar central Virginia ponds with different trophic states (one already receiving animal waste effluent was eutrophic, the other unenriched pond was oligotrophic). A comparison of phytoplankton development and nutrient levels in the two ponds was established prior to the diversion of effluent wastes into the oligotrophic pond. The eutrophic pond's higher trophic status appeared to have been induced by sewage effluent. Each pond contained a distinctive algal flora; the organically enriched waters of the eutrophic pond supported large populations of blue greens, coccoid green algal, and flagellates while the nutrient poor oligotrophic pond contained lower numbers of phytoplankton and a paucity of filamentous green algae, desminds, pennate diatoms and dinoflagellates. After diversion of wastes into the as yet unenriched oligotrophic pond, the ponds were closely monitored to observe changes in algal flora and trophic levels. Throughout the study the biological productivity of both lakes was determined periodically by measuring 14CO2 uptake, total extractable chlorophyll, and the relative dominance of the algal genera in order to evaluate changes in trophic status.

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