EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/26/2021 | 8:30 AM - 10:30 AM | EFFECTS OF BACILLUS THURINGIENSIS ISRAELENSIS ON METHANE DYNAMICS IN PONDS | Virtual Platform
EFFECTS OF BACILLUS THURINGIENSIS ISRAELENSIS ON METHANE DYNAMICS IN PONDS
Ponds are globally important emitters of methane (CH4), a highly potent greenhouse gas. Net emission rates of CH4 are the result of anaerobic production and aerobic oxidation of CH4. Bio-turbation and bio-irrigation, e.g. by chironomid larvae, may increase CH4 oxidation by enhancing oxygen transport into the sediment. Widely applied biological mosquito control agents Bacillus thuringiensis israelensis (Bti) can strongly reduce the abundance of non-target chironomids. We tested whether Bti application has implications for CH4 dynamics in ponds. We measured CH4 concentrations and fluxes in aquatic, aquatic-terrestrial, and terrestrial compartment of twelve small (147 m2) artificial ponds. Half of these ponds were treated three times with Bti (treatment ponds), while the remaining ponds were free of Bti (control ponds). Dissolved CH4 concentrations and fluxes varied widely over seasons, within, and between ponds. No significant differences of concentrations and fluxes were observed between Bti treated and control ponds. Our results suggest that Bti did not affect ecosystem-scale CH4 dynamics in the ponds. Further research is needed to determine whether potential effects were masked by large natural variability among replicated pond ecosystems.
- Greenhouse gases
- Stressor
- Anthropogenic
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Presenters/Authors
caroline Ganglo
(), University of Koblenz-Landau, Institute for Environmental Sciences, Department of Environmental Physics, Systemlink research training group, Fortstr. 7, 76829 Landau, Germany , ganglo@uni-landau.de;
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Andreas Lorke
(), University Koblenz-Landau, Landau, Germany, andreas.lorke@uni-landau.de;
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Alessandro Manfrin
(), University of Koblenz-Landau, Institute for Environmental Sciences, Department of Environmental Physics, Systemlink research training group, Fortstr. 7, 76829 Landau, Germany, manfrin@uni-landau.de;
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Clara Mendoza-Lera
(), iES, University of Koblenz-Landau (Germany), clara.mendozalera@gmail.com;
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