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Wednesday, January 31 • 11:00am - 11:10am
LIGHTING TALK: Insecticide Exposure Risk for Grassland Wildlife on Public Land in Southwestern Minnesota

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AUTHORS. Katelin M. Goebel, Minnesota Cooperative Fish and Wildlife Research Unit, University of Minnesota; Nicole M. Davros, Farmland Wildlife Populations and Research Group, Minnesota Department of Natural Resources; David E. Andersen, U.S. Geological Survey, Minnesota Cooperative Fish and Wildlife Research Unit, University of Minnesota

ABSTRACT. Increasing evidence suggests that acute toxicity to pesticides may be a greater threat to grassland wildlife than habitat loss due to agricultural intensification. In Minnesota, many remaining grasslands are fragmented and surrounded by row crops, including over 3 million hectares of soybeans. Insecticides are widely used in Minnesota’s agricultural region to combat soybean aphids, which feed on soybean plants and negatively impact yield. The insecticides chlorpyrifos, lambda-cyhalothrin, and bifenthrin have been shown to be highly toxic to non-target organisms such as birds and pollinators. Members of the public and Minnesota Department of Natural Resources wildlife managers have observed fewer birds and insects after these chemicals are applied in late summer, raising concerns about the impacts of these chemicals on grassland wildlife. Our objectives are to assess the direct and indirect exposure risks of grassland birds and their insect food resources to soybean aphid insecticides. Specifically, we are (1) measuring the deposition of soybean aphid insecticides from the edges of sprayed fields to the interiors of adjacent grasslands, (2) comparing chemical residues on invertebrates collected prior to and post-spraying, and (3) comparing the relative abundance, richness, diversity, and biomass of invertebrates along a gradient from soybean field edge to grassland interior prior to and post-application. We began sampling in southwestern Minnesota during summer 2017 and will continue in summer 2018. Our research will allow us to inform decision-making by land managers and private landowners so they can better design areas set aside for wildlife, thus reducing the impacts of spray drift on grassland wildlife.

Wednesday January 31, 2018 11:00am - 11:10am
103C

Attendees (20)