ACKNOWLEDGEMENTS

Several individuals were instrumental in completing this study. For their contributions we thank Laboratory Assistants, Cory Bryant, Reid Claussen, Kristin Dahm, Taylor Edgar, Kirsten Larson, Jeffrey Moritz, and Amanda Vellinga for sample preparation and analysis and Field Assistants, Jaron Balvanz, Jon Cowan, Kristin Dahm, Adam DeBolt, Mathew Dorn, Derek Hauer, Kevin Jensen, and Anne Patterson for sample collection in the field. The project was executed with funding from the Iowa Department of Natural Resources (Contract No. ESD04HALFasch110155).