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JOURNAL OF PLANKTON RESEARCH | VOLUME 14 | NUMBER 12 | PAGES 1687-1696 | 1992
© Oxford University Press

research-article

Acidification effects on the plankton size spectrum: an in situ mesocosm experiment

Karl E. Havens

Department of Biological Sciences and Water Resources Research Institute Kent State University, Kent, OH 44242, USA

Received on June 1, 1992; accepted on August 10, 1992 Triplicate in situ enclosures containing plankton from a small glacial kettle lake were either untreated (pH>8) or were acidified to pH 6.5, 5.5 or 4.5 over 7 days using H2SO4. Plankton size spectra were constructed, in order to quantify acidification impacts on mean phytoplankton size (MESDp), mean zooplankton size (MESDz), and phytoplankton-zooplankton size difference (the P-Z distance). Acidification to pH 6.5 did not significantly affect the size spectrum parameters. However, at pH 5.5 and 4.5, MESDp increased, MESDz declined, and the P-Z distance was greatly reduced. These changes reflected a simultaneous shift to large phytoplankton (Peridinium) and small zooplankton (rotifers and nauplii) dominance at low pH.


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