Effects of a larval mosquito biopesticide and Culex larvae on a freshwater nanophytoplankton (Selenastrum capricornatum) under axenic conditions

Journal of Vector Ecology : Journal of the Society for Vector Ecology
Dagne DugumaWilliam E Walton

Abstract

The effects of microbial biopesticides used for mosquito control on autotrophic microorganisms such as nanophytoplankton are equivocal. We examined impacts of mosquito biopesticides and mosquito larvae on primary producers in two independent experiments. In the first experiment, we examined the effects of a commonly used microbial biopesticide formulation (VectoMax®CG) on a unicellular microalga, Selenastrum capricornatum Printz, under axenic laboratory conditions. The biopesticide treatments included two concentrations (0.008 and 0.016 g liter-1) of VectoMax®CG and two controls (one untreated and another with autoclaved 0.016 g VectoMax®CG liter-1) in replicated axenic experimental microcosms. Spectrophotometric analysis of chlorophyll a (proxy for algal biomass) and direct enumeration of algal cells following the treatments revealed no significant effects of the microbial biopesticide on algal population growth during the four-week study. In the second experiment, we tested the effects of different densities of Culex larvae on the population of S. capricornatum. Effects of mosquito larvae feeding on S. capricornatum were significant with a curvilinear relationship between larval density and algal abundance in the water column...Continue Reading

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Citations

May 21, 2020·Environmental Science and Pollution Research International·Francine Perri VenturiniVanderlei Salvador Bagnato
Aug 27, 2021·Toxins·Maria Helena Neves Lobo Silva-FilhaAlejandra Bravo

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