Baltimore Ecosystem Study Institute of Ecosystem Studies

2013 BES Annual Meeting Presentation and Poster Abstracts

Monitoring mosquito production in stormwater control structures
DeLonge, Jennifer
Co-Authors: Jennifer DeLonge, Robert Johnson, Shannon L. LaDeau

The Clean Water Act regulates the delivery of pollutants and flow to primary (recipient) waters and anthropogenic development now incorporates storm water management design for this purpose. As a result, standing water has been re-integrated into residential and commercial landscapes through stormwater control structures (SCS). These engineered ecosystems are designed to ameliorate hydrological impacts of urbanization by reducing peak discharge and storing water for pollution and sediment abatement. However, SCS with pools that persist for more than 72-hours may be important mosquito habitat. This poster describes a new monitoring effort to evaluate the abiotic and biotic factors that determine whether or not SCS are productive mosquito habitat. We sampled for mosquito larvae in 8 extended detention basins in Baltimore County following precipitation events during the mosquito season in 2012 and 2013. In 2012, the predominant West Nile virus vector species, Culex pipiens, were found at 100% of the sites, and at 75% of the sites in every sample period. Mosquito presence (40% of sites) and abundances were lower in 2013, with maximum larval abundance equal to roughly 1% of the maximum abundance in 2012. Larval abundance was generally higher at sites with greater impervious surface and total developed cover in a 1-km buffer.