Clothianidin Decomposition in Missouri Wetland Soils

Date Published: 

Thursday, August 1, 2019

Authors: 

  • Chelsey Beringer
  • Keith Goyne
  • Elisabeth (Lisa) Webb
  • Doreen Mengel

Paper Summary/Abstract: 

Detections of neonicotinoids in surface waters, including wetlands, has raised concern regarding whether these insecticides might negatively influence non-target aquatic insect communities and, as a result, potentially disrupt aquatic food webs. Clothianidin (CTN), introduced in 2003, is currently one of the most widely applied neonicotinoid active ingredients. Although some studies have found that soil microbes play an important role in neonicotinoid degradation, anoxic (i.e., absence of oxygen) conditions also appear to be a primary factor affecting CTN half-life in certain soils. Inundating wetland soils, a common wetland management practice, can promote anoxic conditions whereas the opposing action of removing water (i.e., conducting a drawdown) encourages oxic (oxygen-rich) conditions. Understanding the effects anoxic and oxic conditions have on CTN degradation in wetland soils can help inform whether wetland management decisions result in conditions which may lead to reduced CTN concentrations. Our objective was to evaluate the influence of wetland soil saturation on CTN decomposition in soils of different textures collected from Missouri Department of Conservation (MDC) intensively-managed wetlands.
MDC Science Note Vol 14 No 8, 2019.

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