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Monday, February 6 • 3:40pm - 4:00pm
Technical Session. Quantifying Neonicotinoid Concentrations in Missouri Public Wetlands: The Relationship to Agricultural Land Use

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AUTHORS: Kyle Kuechle, Missouri Cooperative Fish and Wildlife Research Unit, School of Natural Resources, University of Missouri; Elisabeth B. Webb, U.S. Geological Survey Missouri Cooperative Fish and Wildlife Research Unit; Doreen Mengel, Missouri Department of Conservation, Resource Science Division; Anson Main, Missouri Cooperative Fish and Wildlife Research Unit, School of Natural Resources, University of Missouri

ABSTRACT: Neonicotinoids are the most widely used and fastest growing class of insecticides commercially available for agricultural use in North America. Growing popularity of neonicotinoids is related to their broad range of application techniques, especially seed dressings, combined with structural abilities that target a wide variety of invertebrate pests. Ubiquitous use coupled with physico-chemical properties that enhance environmental mobility have led to neonicotinoids being detected in global surface waters including streams and wetlands of North America, representing a potential risk to beneficial aquatic organisms. Despite increased sampling efforts, little is known about neonicotinoid concentrations in intensively managed moist-soil wetlands common to Missouri and which factors influence their persistence and toxicity. To that end, we sampled water and sediment from 40 public wetlands under different common management regimes across Missouri during three sampling periods in 2016 (pre-plant, post-plant, and after autumn inundation). All samples were analyzed for the six most common neonicotinoid active ingredients. Clothianidin was the most commonly detected neonicotinoid in water samples collected pre-planting (26 of 39 wetlands) with a maximum detected concentration of 0.041 µg/L. We evaluated the relationship between watershed land-use as well as wetland management variables (e.g. crop planting) and concentration variability among wetlands, found neonicotinoid concentrations increased with the proportion of associated agricultural land use. Results of this study will be useful in determining neonicotinoid risk to aquatic invertebrates and wetland-dependent organisms reliant on these critical food resources for which Missouri wetlands are typically managed.

Monday February 6, 2017 3:40pm - 4:00pm
Grand Ballroom C

Attendees (9)