Title
Community and Ecosystem Responses to a Pulsed Pesticide Disturbance in Freshwater Ecosystems
Document Type
Article
Publication Date
2008
Publication Title
Ecotoxicology
Volume Number
17
Issue Number
6
DOI
10.1007/s10646-008-0211-3
Abstract
Pesticides have been shown to be detrimental to key groups of freshwater organisms including cladocerans, odonates, and amphibians. However, less is known about the response of freshwater communities and ecosystems to pesticide disturbances as they occur in nature. Using outdoor aquatic mesocosms, we assembled identical and diverse replicate freshwater plankton food webs obtained from an adjacent pond. We established three pesticide treatments consisting of pulses of a common pesticide Sevin® with the active ingredient carbaryl, at concentrations of 0.1, 1 and 20 μg carbaryl/ml, and a pesticide-free control treatment. We monitored the response of microbial, phytoplankton, and zooplankton communities in addition to oxygen concentrations. Carbaryl concentrations peaked shortly after Sevin application and degraded quickly and treatment differences were undetectable after 30 days. Zooplankton richness, diversity, abundance, and oxygen concentrations all decreased in pulsed treatments, while phytoplankton and microbial abundance increased. Zooplankton composition in the high pesticide treatment consisted primarily of rotifers as compared to dominance by copepods in the other three treatments. While many of the community and ecosystem properties showed signs of recovery within 40 days after the pulsed pesticide disturbance, important and significant differences remained in the microbial, phytoplankton and zooplankton communities after the pesticide degraded.
ISSN
0963-9292
First Page
539
Last Page
548
Recommended Citation
Tuhela-Reuning, Laura; Downing, Amy L.; DeVanna, Kristen; Rubeck-Schurtz, C. Nichole; and Grunkemeyer, Heather, "Community and Ecosystem Responses to a Pulsed Pesticide Disturbance in Freshwater Ecosystems" (2008). Botany & Microbiology Faculty Work. 45.
https://digitalcommons.owu.edu/bomi_pubs/45
Link Out URL
https://doi.org/10.1007/s10646-008-0211-3