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Tuesday, February 7 • 6:00pm - 9:00pm
Poster Display. Use of Silicone Passive Sampling Devices (PSDs) for Assaying Potential Exposure of Northern Leopard Frogs to Pesticides in Agricultural Wetlands

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AUTHORS: Jennifer Swanson, Iowa State University; Taylor Yaw, Iowa State University; Clay Pierce, US Geological Survey, Iowa Cooperative Fish and Wildlife Research Unit, Iowa State University; Kelly Smalling, US Geological Survey; Mark Vandever, US Geological Survey; Bianca Zaffarano, Iowa State University; and Erin Muths, US Geological Survey, Amphibian Research and Monitoring Initiative

ABSTRACT: Amphibians are considered particularly susceptible to environmental contaminants due to their physiological traits and utilization of both aquatic and terrestrial habitats. In predominantly agricultural landscapes such as Iowa, contact with pesticides may result in a variety of sub-lethal effects on amphibians. These effects range from immune suppression to reproductive and behavioral changes. In a field setting, assessing long-term pesticide exposure can be problematic. Pesticide presence and concentration may fluctuate greatly over time, and measurements of environmental contaminants are usually limited to single time points or stationary samplers. One emerging method to test chemical concentrations in the environment is passive sampling devices (PSDs) which utilize passive diffusion to sequester a wide range of contaminants over days to weeks. One material used for PSDs is silicone, which has been shown to absorb a wide range of organic contaminants, such as pesticides. Our objective was to use silicone PSDs to understand potential exposure of Northern leopard frogs (Lithobates pipiens) to pesticides in agricultural wetlands. To our knowledge, silicone has not been utilized to assess potential contaminant exposure for a wildlife species at an individual level. As a bio-compatible compound, silicone is ideal for attachment to amphibian skin. In 2015 and 2016 we tested the use of silicone PSDs in the following ways: (1) suturing PSDs to the ventral surface of radio tracked frogs; (2) fitting PSD belts to radio tracked frogs; (3) placing PSDs in locations used by radio tracked frogs and moving them daily; (4) placing stationary PSDs in summer foraging habitat; and (5) placing stationary PSDs in overwintering habitat. The success of deployment methods to collect environmental contaminant data from silicone was variable, but analysis of the silicone confirmed its utility as a sampling device. PSD analysis from the 2015 field season showed presence of several pesticides including herbicides and fungicides.

Tuesday February 7, 2017 6:00pm - 9:00pm
Lancaster Ballroom

Attendees (1)