Does biocide treatment for mosquito control alter carbon dynamics in floodplain ponds?

Ganglo, Caroline; Mendoza‐Lera, Clara; Manfrin, Alessandro; Bolpagni, Rossano; Gerstle, Verena; Kolbenschlag, Sara; Bollinger, Eric; Schulz, Ralf; Lorke, Andreas

doi:10.1016/j.scitotenv.2023.161978

Cited by 5 publications

(5 citation statements)

References 30 publications

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“…Hanson & Hanson, 1996; Lew & Glińska‐Lewczuk, 2018); however, the increased chironomid larval bioturbation in June and July may have enhanced MOB activity, thereby reducing CH 4 production, as suggested by Ganglo et al. (2022, 2023). Lower N 2 O concentrations in the summer are at odds with some, but not all, of the constructed wetland literature and may be due to lower nitrate reduction rates in summer (Huang et al., 2013).…”

Section: Discussionmentioning

confidence: 93%

“…N:P ratios affected GHG concentrations but had only small effects on chironomid emergence rates or community composition. In contrast, tion, as suggested by Ganglo et al (2022Ganglo et al ( , 2023. Lower N 2 O concentrations in the summer are at odds with some, but not all, of the constructed wetland literature and may be due to lower nitrate reduction rates in summer (Huang et al, 2013).…”

Section: When Relating Ghg Concentrations and Chironomid Variablesmentioning

confidence: 89%

“…However, biota also affects the production of greenhouse gases, particularly CH 4 . For instance, chironomids have been shown to directly utilize methane‐oxidizing bacteria (MOB) in aquatic sediments (Belle et al., 2018; Jones et al., 2008) and bioturbation caused by chironomid movements may increase oxygenation, thereby mitigating CH 4 production (Ganglo et al., 2022, 2023). Our study is consistent with such a link between CH 4 production and chironomid emergence rates but also suggests that the potential reduction of methane concentrations by chironomid larvae does not fully compensate for increased methane production by processes such as microbial activity.…”

Section: Discussionmentioning

confidence: 99%

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Wetland productivity determines trade‐off between biodiversity support and greenhouse gas production

Åhlén,

Peacock,

Brodin

et al. 2023

Ecology and Evolution

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Establishing wetlands for nutrient capture and biodiversity support may introduce trade‐offs between environmentally beneficial functions and detrimental greenhouse gas emissions. Investigating the interaction of nutrient capture, primary production, greenhouse gas production and biodiversity support is imperative to understanding the overall function of wetlands and determining possible beneficial synergistic effects and trade‐offs. Here, we present temporally replicated data from 17 wetlands in hemi‐boreal Sweden. We explored the relationship between nutrient load, primary producing algae, production of methane and nitrous oxide, and emergence rates of chironomids to determine what factors affected each and how they related to each other. Chironomid emergence rates correlated positively with methane production and negatively with nitrous oxide production, where water temperature was the main driving factor. Increasing nutrient loads reduced methanogenesis through elevated nitrogen concentrations, while simultaneously enhancing nitrous oxide production. Nutrient loads only indirectly increased chironomid emergence rates through increased chlorophyll‐a concentration, via increased phosphorus concentrations, with certain taxa and food preference functional groups benefitting from increased chlorophyll‐a concentrations. However, water temperature seemed to be the main driving factor for chironomid emergence rates, community composition and diversity, as well as for greenhouse gas production. These findings increase our understanding of the governing relationships between biodiversity support and greenhouse gas production, and should inform future management when constructing wetlands.

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Section: Discussionmentioning

confidence: 93%

Section: When Relating Ghg Concentrations and Chironomid Variablesmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

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Wetland productivity determines trade‐off between biodiversity support and greenhouse gas production

Åhlén,

Peacock,

Brodin

et al. 2023

Ecology and Evolution

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“…To the best of our knowledge, our study provides the first evidence of functional implications of the mosquito biocide Bti in biogeochemical cycling in sediments from a freshwater aquatic ecosystem. Previous research was limited to the effect on the structure of planktonic communities [46], or could not distinguish Bti effects from those induced by changes in the macroinvertebrate density [29,30]. We hypothesized that Bti excipients could represent a pulse of labile dissolved organic carbon (DOC), temporarily promoting aerobic (CO 2 dynamics) and anerobic (CH 4 dynamics) carbon processing.…”

Section: Effects Of Bti On Ch 4 and Co 2 Dynamics In Aquatic Sedimentmentioning

confidence: 99%

“…The authors proposed that the decrease in chironomid larvae density may affect both CH 4 and CO 2 dynamics via alterations in bioturbation activity. Furthermore, it has been suggested that the excipient of Bti contains bioavailable dissolved organic carbon [30] that could potentially boost aerobic respiration and methanogenesis for a given limited time [5,31,32]. Experimental evidence for these conjectures from former studies, however, is lacking, as the specific effect pathway by which Bti addition has affected the CH 4 emissions in the mesocosm experiments could not be disentangled.…”

Section: Introductionmentioning

confidence: 99%

Effects of chironomid larvae density and mosquito biocide on methane and carbon dioxide dynamics in freshwater sediments

Ganglo,

Manfrin,

Mendoza-Lera

et al. 2024

PLoS ONE

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Small lentic water bodies are important emitters of methane (CH4) and carbon dioxide (CO2), but the processes regulating their dynamics and susceptibility to human-induced stressors are not fully understood. Bioturbation by chironomid larvae has been proposed as a potentially important factor controlling the dynamics of both gases in aquatic sediments. Chironomid abundance can be affected by the application of biocides for mosquito control, such as Bti (Bacillus thuringiensis var. israelensis). Previous research has attributed increases in CH4 and CO2 emissions after Bti application to reduced bioturbation by chironomids. In this study, we separately tested the effect of chironomid bioturbation and Bti addition on CH4 production and emission from natural sediments. In a set of 15 microcosms, we compared CH4 and CO2 emission and production rates with high and low densities of chironomid larvae at the bioturbating stage, and standard and five times (5x) standard Bti dose, with control sediments that contained neither chironomid larvae nor Bti. Regardless of larvae density, chironomid larvae did not affect CH4 nor CO2 emission and production of the sediment, although both rates were more variable in the treatments with organisms. 5xBti dosage, however, led to a more than three-fold increase in CH4 and CO2 production rates, likely stimulated by bioavailable dissolved carbon in the Bti excipient and priming effects. Our results suggest weak effects of bioturbating chironomid larvae on the CH4 and CO2 dynamics in aquatic ecosystems. Furthermore, our results point out towards potential functional implications of Bti for carbon cycling beyond those mediated by changes in the macroinvertebrate community.

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Environmental regulation and carbon emissions: New mechanisms in game theory

Cao,

Ren,

Yue

2024

Cities

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Does biocide treatment for mosquito control alter carbon dynamics in floodplain ponds?

Cited by 5 publications

References 30 publications

Wetland productivity determines trade‐off between biodiversity support and greenhouse gas production

Wetland productivity determines trade‐off between biodiversity support and greenhouse gas production

Effects of chironomid larvae density and mosquito biocide on methane and carbon dioxide dynamics in freshwater sediments

Environmental regulation and carbon emissions: New mechanisms in game theory

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