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JOURNAL OF PLANKTON RESEARCH | VOLUME 15 | NUMBER 6 | PAGES 683-691 | 1993
© Oxford University Press

research-article

Acid and aluminum effects on osmoregulation and survival of the freshwater copepod Skistodiaptomus oregonensis

Karl E. Havens

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

Received on September 17, 1992; accepted on February 15, 1993 The freshwater copepod Skistodiaptomus oregonensis was exposed, in laboratory bioassays, to a 3 x 3 factorial array of pH and aluminum treatments (pH 4.5, 6.0 and 7.5, and 0, 100 or 200 µg l–1 Al). After 12 and 24 h, whole-body Na content and survivals were determined for groups of 10 animals per treatment. Declines in bodily Na were taken as evidence of osmoregulatory dysfunction. Both Na content and survival were reduced at pH 6.0 and especially at pH 4.5. The magnitude of responses depended on the Al concentration. Exposure to the highest Al level tended to reduce Na content and survival at pH 6.0, but tended to enhance Na content and survival at pH 4.5. The results suggest that extinction of large copepods during lake acidification is due in part to effects of acid stress on osmoregulation and that Al toxicity may be a contributing factor, since population declines in nature occur at pH near 6.0.


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