CSI Environmental Consultant Presentation at PNW SETAC on Aquatic Refugia in Ecological Risk Assessment

CSI Environmental Consultant, Kayla Campasino presented the following presentation at the 2016 Society of Environmental Toxicology and Chemistry (SETAC) Pacific Northwest Chapter Annual Meeting – Bellingham, WA – June 1-4, 2016.  Please find the abstract and presentation below:

Aquatic Refugia preso cover

Aquatic Refugia: Relevance and Significance in Ecological Risk Assessment

Abstract: Aquatic environments may receive unintentional exposure to pesticides applied to nearby agricultural fields. Ecological risk assessment (ERA) is a necessary tool for estimating the potential for adverse effects to aquatic ecosystems and associated biota, and is a requirement of the pesticide registration process. Current exposure models utilized in aquatic ERA assume a homogenous pesticide distribution within a water body, and effects analyses are based on standardized laboratory toxicity studies. While this approach utilizes the best available data and conservative assumptions, a more realistic approach could incorporate the influence of habitat refugia on exposure and recovery of aquatic organisms to estimate risk. Habitat refugia result from spatial and/or temporal variations in pesticide concentrations within an aquatic environment, creating areas or times where organisms may experience lower exposure concentrations compared to the water body as a whole. Additionally, uneven pesticide distributions within an aquatic environment allow species to recolonize heavily affected areas from less affected areas. These spatial and temporal variations may occur due to a variety of factors, including environmental heterogeneity, physicochemical properties of compounds, and environmental fate of compounds. For example, the hydrophobic nature of pyrethroids causes these compounds to sorb to aquatic macrophytes and sediments, rapidly reducing the bioavailable concentration in the water column. This presentation will discuss these phenomena in detail, using peer reviewed literature consisting of field and mesocosm studies. Future directions regarding the inclusion of refugia into ERA will also be discussed.

For more information on the presentation, please visit our Reports and Presentations page on our website (www.complianceservices.com) or contact us at info@complianceservices.com to learn more about CSI.

For a list of other events that CSI will be attending in 2016, visit our Events page.

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