Effects of Bacillus thuringiensis israelensis and spinosad on adult emergence of the non-biting midges Polypedilum nubifer (Skuse) and Tanytarsus curticornis Kieffer (Diptera: Chironomidae) in coastal wetlands

Duchet, Claire; Franquet, Évelyne; Lagadic, Laurent; Lagneau, Christophe

doi:10.1016/j.ecoenv.2015.02.029

Cited by 24 publications

(13 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The analysis of chironomid communities from eight different study sites representing a wide variety of ecological conditions showed that appropriate dosages of Bti can efficiently control mosquito larval populations (up to 90% reduction) with no detectable effects on non-biting midge larvae. This is fully consistent with the conclusions from shortterm semi-field experiments (Charbonneau et al, 1994;Liber et al, 1998;Pont et al, 1999;Russell et al, 2009;Duchet et al, 2015) and from field studies conducted over multiple years (Barnes and Chapman, 1998;Balcer et al, 1999;Caquet et al, 2011;Lundström et al, 2010a,b;Persson Vinnersten et al, 2010;Lagadic et al, 2014). Most of these studies, as well as those reporting transient effects on chironomids (Hershey et al, 1995(Hershey et al, , 1998Niemi et al, 1999), recognized the predominant role of natural environmental variables in invertebrate Fig.…”

Section: Discussionsupporting

confidence: 84%

“…Overall, VectoBac® WDG applications in site C01 were not associated with clear effect on chironomids. However, given that chironomids were not identified to species level, effects of Bti on individual species cannot be ruled out, although previous studies at higher taxonomic resolution (i.e., species level) did not detect effects at VectoBac® application rates recommended for mosquito control (Lundström et al, 2010a;Duchet et al, 2015). Note that another study that claimed effects of Bti on chironomids (Poulin, 2012) relied on data obtained at a much higher level of taxonomic resolution than those achieved in the present study.…”

Section: Discussioncontrasting

confidence: 62%

See 1 more Smart Citation

No association between the use of Bti for mosquito control and the dynamics of non-target aquatic invertebrates in French coastal and continental wetlands

Lagadic

Schäfer

Roucaute

et al. 2016

Science of The Total Environment

Self Cite

View full text Add to dashboard Cite

The environmental safety of Bacillus thuringiensis subsp. israelensis (Bti) is still controversial, mainly because most of the previous field studies on its undesired effects were spatially limited and did not address the relationship between community similarity and application time and frequency. No general statement can therefore be drawn on the usage conditions of Bti that insure protection of non-target organisms. The present study was conducted in eight sites distributed over the main geographical sectors where mosquito control is implemented in mainland France and Corsica. Changes in non-target aquatic invertebrates were followed at elapsed time after repeated applications of two Bti formulations (VectoBac® WDG or 12AS) up to four consecutive years. We examined the influence of both larvicide treatments and environmental variables on community dynamics and dissimilarity between treated and control areas. As it can be argued that chironomids are the most vulnerable group of non-target invertebrates, we scrutinised potential Bti-related effects on the dynamics of their community. The use of VectoBac® WDG and 12AS in coastal and continental wetlands had no immediate or long-term detectable effect on the taxonomic structure and taxa abundance of non-target aquatic invertebrate communities, including chironomids. This applied to the main habitats where mosquito larvae occur, regardless of their geographic location. Flooding, whose frequency and duration depend on local meteorological and hydrological conditions, was identified as the main environmental driver of invertebrate community dynamics. Our findings add support to the environmental safety of currently available Bti formulations when following recommended application rates and best mosquito control practices.

show abstract

Section: Discussionsupporting

confidence: 84%

Section: Discussioncontrasting

confidence: 62%

No association between the use of Bti for mosquito control and the dynamics of non-target aquatic invertebrates in French coastal and continental wetlands

Lagadic

Schäfer

Roucaute

et al. 2016

Science of The Total Environment

Self Cite

View full text Add to dashboard Cite

show abstract

“…Charbonneau et al ( 1994 ) found that although Bti caused high mortality of chironomids in a laboratory, a much lower and statistically non-significant mortality was observed in the field. Similarly, Duchet et al ( 2015 ) did not observe any effects on two chironomid species and Lagadic et al ( 2016 ) observed no immediate or long-term effects on chironomid community structure after application of Bti.…”

Section: Approach and Risk Characterizationmentioning

confidence: 90%

Larval mosquito management and risk to aquatic ecosystems: A comparative approach including current tactics and gene-drive Anopheles techniques

Peterson

Rolston

2022

Transgenic Res

View full text Add to dashboard Cite

Genetic engineering of mosquitoes represents a promising tactic for reducing human suffering from malaria. Gene-drive techniques being developed that suppress or modify populations of Anopheles gambiae have the potential to be used with, or even possibly obviate, microbial and synthetic insecticides. However, these techniques are new and therefore there is attendant concern and uncertainty from regulators, policymakers, and the public about their environmental risks. Therefore, there is a need to assist decision-makers and public health stewards by assessing the risks associated with these newer mosquito management tactics so the risks can be compared as a basis for informed decision making. Previously, the effect of gene-drive mosquitoes on water quality in Africa was identified as a concern by stakeholders. Here, we use a comparative risk assessment approach for the effect of gene-drive mosquitoes on water quality in Africa. We compare the use of existing larvicides and the proposed genetic techniques in aquatic environments. Based on our analysis, we conclude that the tactic of gene-drive Anopheles for malaria management is unlikely to result in risks to aquatic environments that exceed current tactics for larval mosquitoes. As such, these new techniques would likely comply with currently recommended safety standards.

show abstract

“…Apparently, Bti can negatively affect the number of chironomid larvae with regular treatments with mosquito repellents [ 199 , 201 ]; however, the negative effect of bacteria on chironomids has not been universally acclaimed [ 202 , 203 , 204 , 205 ]. Nevertheless, the change in the availability of chironomids as a food resource can affect the reproductive success of birds [ 184 , 206 ] and the species diversity of dragonflies [ 199 ].…”

Section: Aquatic Ecosystemsmentioning

confidence: 99%

Dissecting the Environmental Consequences of Bacillus thuringiensis Application for Natural Ecosystems

Belousova

Malovichko

Shikov

et al. 2021

Toxins

View full text Add to dashboard Cite

Bacillus thuringiensis (Bt), a natural pathogen of different invertebrates, primarily insects, is widely used as a biological control agent. While Bt-based preparations are claimed to be safe for non-target organisms due to the immense host specificity of the bacterium, the growing evidence witnesses the distant consequences of their application for natural communities. For instance, upon introduction to soil habitats, Bt strains can affect indigenous microorganisms, such as bacteria and fungi, and further establish complex relationships with local plants, ranging from a mostly beneficial demeanor, to pathogenesis-like plant colonization. By exerting a direct effect on target insects, Bt can indirectly affect other organisms in the food chain. Furthermore, they can also exert an off-target activity on various soil and terrestrial invertebrates, and the frequent acquisition of virulence factors unrelated to major insecticidal toxins can extend the Bt host range to vertebrates, including humans. Even in the absence of direct detrimental effects, the exposure to Bt treatment may affect non-target organisms by reducing prey base and its nutritional value, resulting in delayed alleviation of their viability. The immense phenotypic plasticity of Bt strains, coupled with the complexity of ecological relationships they can engage in, indicates that further assessment of future Bt-based pesticides’ safety should consider multiple levels of ecosystem organization and extend to a wide variety of their inhabitants.

show abstract

Effects of Bacillus thuringiensis israelensis and spinosad on adult emergence of the non-biting midges Polypedilum nubifer (Skuse) and Tanytarsus curticornis Kieffer (Diptera: Chironomidae) in coastal wetlands

Cited by 24 publications

References 74 publications

No association between the use of Bti for mosquito control and the dynamics of non-target aquatic invertebrates in French coastal and continental wetlands

No association between the use of Bti for mosquito control and the dynamics of non-target aquatic invertebrates in French coastal and continental wetlands

Larval mosquito management and risk to aquatic ecosystems: A comparative approach including current tactics and gene-drive Anopheles techniques

Dissecting the Environmental Consequences of Bacillus thuringiensis Application for Natural Ecosystems

Contact Info

Product

Resources

About