thumbnail

The use of outdoor freshwater pond microcosms. III. Responses of phytoplankton and periphyton to pyridaben

Environmental Toxicology

By:
, , ,
DOI: 10.1002/1522-7278(2001)16:1<96::AID-TOX110>3.0.CO;2-U

Links

Abstract

An outdoor freshwater microcosm study was conducted in which pyridaben, an insecticide-miticide, was directly applied to water to determine its biological effects on phytoplankton and periphyton. Twenty-four microcosms (24 m3 each) were monitored for 11 months, then four treatments of pyridaben were applied two times at three concentrations (0.34, 34.0 ??g/L), including an untreated control. The succession of algal groups observed and the major genera found in microcosms during the baseline phase of the study were typical of oligo-mesotrophic systems in Florida. Following application of pyridaben, the most remarkable effect was a positive correlation of phytoplankton abundance with pyridaben concentrations in water; indicating increased abundance as a result of exposure. Both Chlorophyta and Pyrrophyta exhibited a significant increase (p=0.05) in population abundance at 3.4 and 34.0 ??g/L pyridaben. Chrysophyta also elicited a trend of increased abundance at 34.0 ??g/L, although the effect was not significant. The effects on phytoplankton populations were associated with the decline of zooplankton populations as a result of a direct effect of pyridaben exposure. There were no effects of pyridaben on periphyton communities or on functional endpoints. ?? 2001 by John Wiley & Sons, Inc.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The use of outdoor freshwater pond microcosms. III. Responses of phytoplankton and periphyton to pyridaben
Series title:
Environmental Toxicology
DOI:
10.1002/1522-7278(2001)16:1<96::AID-TOX110>3.0.CO;2-U
Volume
16
Issue:
1
Year Published:
2001
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Environmental Toxicology
First page:
96
Last page:
103
Number of Pages:
8