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Effects of methoxychlor on zooplankton in freshwater enclosures: Influence of enclosure size and number of applications
Author(s) -
Solomon Keith R.,
Stephenson Gladys L.,
Kaushik Narinder K.
Publication year - 1989
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620080804
Subject(s) - zooplankton , methoxychlor , enclosure , zoology , biology , toxicity , environmental science , ecology , toxicology , pesticide , chemistry , telecommunications , organic chemistry , computer science
Methoxychlor was applied to 20, 100 and 1,000 m 3 enclosures at a nominal concentration of 20 μg L −1 . Total dissipation was more rapid than expected in the 20 m 3 enclosures (slope = −0.0288) while rates in the 100 and 1,000 m 3 enclosures were similar (slope = −0.0207 and −0.0187, respectively). Effects on zooplankton were less rapid and less severe and recovery more rapid in the 20 m 3 than in the larger enclosures, but little difference was observed between the 100 and 1,000 m 3 enclosures. Comparison of a single application of 20 μg L −1 in 100 m 3 enclosures with two applications of 10 μg L −1 , 35 days apart, also in 100 m 3 enclosures, showed a more rapid dissipation after the first application than after the second (slope = −0.0236 vs. −0.0161). Acute toxic effects were not observed after the second treatment, and little effect on time to recovery was noted. Selection of certain species by the second application of methoxychlor was not observed.