Title
Pesticide concentrations in frog tissue and wetland habitats in a landscape dominated by agriculture
Document Type
Article
Publication Version
Published Version
Publication Date
2015
Journal or Book Title
Science of the Total Environment
Volume
502
First Page
80
Last Page
90
DOI
10.1016/j.scitotenv.2014.08.114
Abstract
Habitat loss and exposure to pesticides are likely primary factors contributing to amphibian decline in agricultural landscapes. Conservation efforts have attempted to restore wetlands lost through landscape modifications to reduce contaminant loads in surface waters and providing quality habitat to wildlife. The benefits of this increased wetland area, perhaps especially for amphibians, may be negated if habitat quality is insufficient to support persistent populations. We examined the presence of pesticides and nutrients in water and sediment as indicators of habitat quality and assessed the bioaccumulation of pesticides in the tissue of twonative amphibian species Pseudacris maculata (chorus frogs) and Lithobates pipiens (leopard frogs) at six wetlands (3 restored and 3 reference) in Iowa, USA. Restored wetlands are positioned on the landscape to receive subsurface tile drainage water while referencewetlands receive water fromoverland run-off and shallow groundwater sources. Concentrations of the pesticides frequently detected inwater and sediment samples were not different between wetland types. The median concentration of atrazine in surface water was 0.2 μg/L. Reproductive abnormalities in leopard frogs have been observed in other studies at these concentrations. Nutrient concentrations were higher in the restored wetlands but lower than concentrations thought lethal to frogs. Complex mixtures of pesticides including up to 8 fungicides, some previously unreported in tissue, were detected with concentrations ranging from 0.08 to 1500 μg/kg wet weight. No significant differences in pesticide concentrations were observed between species, although concentrations tended to be higher in leopard frogs compared to chorus frogs, possibly because of differences in life histories. Our results provide information on habitat quality in restored wetlands that will assist state and federal agencies, landowners, and resource managers in identifying and implementing conservation and management actions for these and similar wetlands in agriculturally dominated landscapes.
Rights
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Language
en
File Format
application/pdf
Recommended Citation
Smalling, Kelly L.; Reeves, Rebecca A.; Muths, Erin; Vandever, Mark; Battaglin, William A.; Hladik, Michelle L.; and Pierce, Clay L., "Pesticide concentrations in frog tissue and wetland habitats in a landscape dominated by agriculture" (2015). Natural Resource Ecology and Management Publications. 99.
https://lib.dr.iastate.edu/nrem_pubs/99
Included in
Aquaculture and Fisheries Commons, Environmental Indicators and Impact Assessment Commons, Natural Resources Management and Policy Commons, Terrestrial and Aquatic Ecology Commons, Toxicology Commons
Comments
This article is from Science of the Total Environment 502 (2015): 80, doi:10.1016/j.scitotenv.2014.08.114.