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Tuesday, January 30 • 11:40am - 12:00pm
UPLAND GAME BIRDS & POLLINATORS: Impacts of Neonicotinoid Seed-treatment Use on Native Pollinator Abundance and Diversity in Missouri Agroecosystems

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AUTHORS. Anson R. Main, School of Natural Resources - University of Missouri; Elisabeth B. Webb, U.S. Geological Survey, Missouri Cooperative Fish and Wildlife Research Unit; Keith W. Goyne, School of Natural Resources - University of Missouri; Doreen Mengel, Missouri Department of Conservation

ABSTRACT. Pervasively used as seed-treatments, neonicotinoid insecticides are widely applied across North American agroecosystems. Due to their high water solubility, neonicotinoids may be rapidly transported to adjacent field margins during precipitation events. Additionally, previous research demonstrates the potential accumulation of residues by non-target plant species. Unlike honeybees, numerous wild bee populations nest in the ground in close proximity to cultivated fields and flower foraging areas. To that end, it is unknown if native bee species are equally exposed to neonicotinoids through soil and non-target plants surrounding cropped fields (i.e., field margins). Few studies have evaluated neonicotinoid impacts on wild pollinator populations, including solitary and eusocial bee species (e.g., bumblebees). To evaluate the effects of neonicotinoid exposure on native pollinator abundance and diversity, we sampled 24 agricultural fields (treated and untreated) on four conservation areas in central and northern Missouri from pre-seeding to harvest in year 2016. At each field, we collected field and field-margin soils, sampled herbaceous and woody flowering species in field margins, and surveyed and collected a wide variety of native pollinators over time. Neonicotinoid residues were detected in field and field-margin soils during all sampling periods (frequency: pre-seeding, 58%; post-seeding, 67%; mid-growing, 69%; and, harvest, 58%). Clothianidin was the most-frequently detected active ingredient in field and margin soils with concentrations ranging from 0.16 to 55.7 µg/kg. Compared to untreated reference fields, native bee abundance was significantly less in both treated corn (ß = -0.72 ± 0.20, P = 0.002) and treated soybean fields (ß = -0.95 ± 0.28, P = 0.005). Here, we present our preliminary findings and discuss how this research improves our understanding of the potential impacts of neonicotinoid seed-treatment use on non-target native pollinator communities in agroecosystems.

Tuesday January 30, 2018 11:40am - 12:00pm CST