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Laurent Lagadic - One of the best experts on this subject based on the ideXlab platform.
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chitobiase activity as an indicator of altered survival growth and reproduction in daphnia pulex and daphnia magna crustacea cladocera exposed to spinosad and diflubenzuron
Ecotoxicology and Environmental Safety, 2011Co-Authors: Claire Duchet, Evelyne Franquet, Christophe Lagneau, Marilia Mitie Inafuku, Thierry Caquet, Michel Larroque, Laurent LagadicAbstract:Chitobiase is involved in exoskeleton degradation and recycling during the moulting process in arthropods. In aquatic species, the moulting fluid is released into the aqueous environment, and chitobiase activity present therein can be used to follow the dynamics of arthropod populations. Here, chitobiase activity was used for monitoring the impact of mosquito candidate Larvicides on Daphnia pulex and Daphnia magna under laboratory conditions. Both species were exposed to spinosad (2, 4, 8 μg L(-1)) and diflubenzuron (0.2, 0.4, 0.8 μg L(-1)) for 14 days. Bacillus thuringiensis var. israelensis (Bti; 0.25, 0.5, 1 μL L(-1)) was used as the reference Larvicide. Chitobiase activity, adult survival, individual growth and fecundity, expressed as the number of neonates produced, were measured every 2 days. Average Exposure Concentrations of spinosad were ten-fold lower than the nominal concentrations, whereas only a slight deviation was observed for diflubenzuron. In contrast to Bti, spinosad and diflubenzuron significantly affected both species in terms of adult survival, and production of neonates. As compared to D. pulex, D. magna was more severely affected by diflubenzuron, at low and medium concentrations, with reduced adult growth and much lower chitobiase activity. Chitobiase activity was positively correlated with the individual body length, number of neonates produced between two consecutive observation dates, and number of females and neonates. In addition, the significant positive correlations between chitobiase activity measured on the last sampling date before the first emission of neonates and the cumulative number of neonates produced during the whole observation period strongly support the potential of the activity of this chitinolytic enzyme as a proxy for assessing the dynamics of arthropod populations exposed to Larvicides used for mosquito control.
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influence of environmental factors on the response of a natural population of daphnia magna crustacea cladocera to spinosad and bacillus thuringiensis israelensis in mediterranean coastal wetlands
Environmental Pollution, 2010Co-Authors: Claire Duchet, Th Caquet, Evelyne Franquet, Christophe Lagneau, Laurent LagadicAbstract:Abstract The present study was undertaken to assess the impact of a candidate mosquito Larvicide, spinosad (8, 17 and 33 μg L −1 ) on a field population of Daphnia magna under natural variations of water temperature and salinity, using Bti (0.16 and 0.50 μL L −1 ) as the reference Larvicide. Microcosms (125 L) were placed in a shallow temporary marsh where D. magna was naturally present. The peak of salinity observed during the 21-day observation period may have been partly responsible for the decrease of daphnid population density in all the microcosms. It is also probably responsible for the absence of recovery in the microcosms treated with spinosad which caused a sharp decrease of D. magna abundance within the first two days following treatment whereas Bti had no effect. These results suggest that it may be difficult for a field population of daphnids to cope simultaneously with natural (water salinity and temperature) and anthropogenic (Larvicides) stressors.
Claire Duchet - One of the best experts on this subject based on the ideXlab platform.
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chitobiase activity as an indicator of altered survival growth and reproduction in daphnia pulex and daphnia magna crustacea cladocera exposed to spinosad and diflubenzuron
Ecotoxicology and Environmental Safety, 2011Co-Authors: Claire Duchet, Evelyne Franquet, Christophe Lagneau, Marilia Mitie Inafuku, Thierry Caquet, Michel Larroque, Laurent LagadicAbstract:Chitobiase is involved in exoskeleton degradation and recycling during the moulting process in arthropods. In aquatic species, the moulting fluid is released into the aqueous environment, and chitobiase activity present therein can be used to follow the dynamics of arthropod populations. Here, chitobiase activity was used for monitoring the impact of mosquito candidate Larvicides on Daphnia pulex and Daphnia magna under laboratory conditions. Both species were exposed to spinosad (2, 4, 8 μg L(-1)) and diflubenzuron (0.2, 0.4, 0.8 μg L(-1)) for 14 days. Bacillus thuringiensis var. israelensis (Bti; 0.25, 0.5, 1 μL L(-1)) was used as the reference Larvicide. Chitobiase activity, adult survival, individual growth and fecundity, expressed as the number of neonates produced, were measured every 2 days. Average Exposure Concentrations of spinosad were ten-fold lower than the nominal concentrations, whereas only a slight deviation was observed for diflubenzuron. In contrast to Bti, spinosad and diflubenzuron significantly affected both species in terms of adult survival, and production of neonates. As compared to D. pulex, D. magna was more severely affected by diflubenzuron, at low and medium concentrations, with reduced adult growth and much lower chitobiase activity. Chitobiase activity was positively correlated with the individual body length, number of neonates produced between two consecutive observation dates, and number of females and neonates. In addition, the significant positive correlations between chitobiase activity measured on the last sampling date before the first emission of neonates and the cumulative number of neonates produced during the whole observation period strongly support the potential of the activity of this chitinolytic enzyme as a proxy for assessing the dynamics of arthropod populations exposed to Larvicides used for mosquito control.
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influence of environmental factors on the response of a natural population of daphnia magna crustacea cladocera to spinosad and bacillus thuringiensis israelensis in mediterranean coastal wetlands
Environmental Pollution, 2010Co-Authors: Claire Duchet, Th Caquet, Evelyne Franquet, Christophe Lagneau, Laurent LagadicAbstract:Abstract The present study was undertaken to assess the impact of a candidate mosquito Larvicide, spinosad (8, 17 and 33 μg L −1 ) on a field population of Daphnia magna under natural variations of water temperature and salinity, using Bti (0.16 and 0.50 μL L −1 ) as the reference Larvicide. Microcosms (125 L) were placed in a shallow temporary marsh where D. magna was naturally present. The peak of salinity observed during the 21-day observation period may have been partly responsible for the decrease of daphnid population density in all the microcosms. It is also probably responsible for the absence of recovery in the microcosms treated with spinosad which caused a sharp decrease of D. magna abundance within the first two days following treatment whereas Bti had no effect. These results suggest that it may be difficult for a field population of daphnids to cope simultaneously with natural (water salinity and temperature) and anthropogenic (Larvicides) stressors.
Giovanni Benelli - One of the best experts on this subject based on the ideXlab platform.
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zingiber cernuum zingiberaceae essential oil as effective Larvicide and oviposition deterrent on six mosquito vectors with little non target toxicity on four aquatic mosquito predators
Environmental Science and Pollution Research, 2018Co-Authors: Mohan Rajeswary, Marimuthu Govindarajan, Naiyf S. Alharbi, Shine Kadaikunnan, Jamal M. Khaled, Giovanni BenelliAbstract:Mosquitoes are responsible for the transmission of many pathogens and parasites, which cause serious diseases in humans and animals. Currently, botanical products have been suggested as alternative tools in the fight against arthropod vectors. In this study, the essential oil (EO) extracted from Zingiber cernuum was tested as Larvicide and oviposition deterrent on six mosquito species of public health relevance, including malaria and Zika virus vectors. The EO showed high toxicity on third instar larvae of Anopheles stephensi (LC50 = 41.34 μg/ml), Aedes aegypti (LC50 = 44.88 μg/ml), Culex quinquefasciatus (LC50 = 48.44 μg/ml), Anopheles subpictus (LC50 = 51.42 μg/ml), Aedes albopictus (LC50 = 55.84 μg/ml), and Culex tritaeniorhynchus (LC50 = 60.20 μg/ml). In addition, low doses of Z. cernuum EO reduced oviposition rates in six mosquito species. The acute toxicity of Z. cernuum EO on four mosquito predators was scarce; LC50 ranged from 3119 to 11,233 μg/ml. Overall, our results revealed that the Z. cernuum EO can be considered for the development of effective and environmental-friendly mosquito Larvicides and oviposition deterrents.
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High efficacy of (Z)-γ-bisabolene from the essential oil of Galinsoga parviflora (Asteraceae) as Larvicide and oviposition deterrent against six mosquito vectors.
Environmental science and pollution research international, 2018Co-Authors: Marimuthu Govindarajan, Baskaralingam Vaseeharan, Naiyf S. Alharbi, Shine Kadaikunnan, Jamal M. Khaled, Mohammed N. Al-anbr, Sami A. Alyahya, Filippo Maggi, Giovanni BenelliAbstract:The eco-friendly management of mosquitoes with novel and effective Larvicides and oviposition deterrents is a crucial challenge to prevent outbreaks of mosquito-borne diseases. However, most of the herbal formulations tested in these years showed LC50 values higher of 40 ppm, and significant oviposition deterrent activity only when tested at relatively higher doses (> 50 μg/ml). Herein, we studied the chemical composition of the Galinsoga parviflora essential oil (EO). This plant is an annual herb native to South America naturalized all over the world. We tested the EO larvicidal and oviposition deterrent action on 6 mosquito species. Totally 37 compounds were identified in the EO of G. parviflora by GC and GC-MS analyses. The major constituent was (Z)-γ-bisabolene (38.9%). The G. parviflora EO and (Z)-γ-bisabolene showed acute toxicity on An. stephensi (LC50 = 31.04 and 2.04 μg/ml, respectively), Ae. aegypti (LC50 = 34.22 and 2.26 μg/ml, respectively), Cx. quinquefasciatus (LC50 = 37.10 and 2.47 μg/ml, respectively), An. subpictus (LC50 = 40.97 and 4.09 μg/ml, respectively), Ae. albopictus (LC50 = 45.55 and 4.50 μg/ml, respectively) and Cx. tritaeniorhynchus (LC50 = 49.56 and 4.87 μg/ml, respectively) larvae. Furthermore, the oviposition deterrent potential of the G. parviflora EO and (Z)-γ-bisabolene was studied on six mosquito vectors, showing that 25 μg/ml of (Z)-γ-bisabolene led to an Oviposition Activity Index lower of − 0.79 in all tested mosquito vectors. Overall, all larvicidal LC50 values estimated for (Z)-γ-bisabolene were lower than 5 μg/ml. This result far encompasses current evidences of toxicity reported for the large majority of botanical products currently tested against mosquito young instars, allowing us to propose this compound as an highly effective mosquito Larvicide and oviposition deterrent.
Evelyne Franquet - One of the best experts on this subject based on the ideXlab platform.
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chitobiase activity as an indicator of altered survival growth and reproduction in daphnia pulex and daphnia magna crustacea cladocera exposed to spinosad and diflubenzuron
Ecotoxicology and Environmental Safety, 2011Co-Authors: Claire Duchet, Evelyne Franquet, Christophe Lagneau, Marilia Mitie Inafuku, Thierry Caquet, Michel Larroque, Laurent LagadicAbstract:Chitobiase is involved in exoskeleton degradation and recycling during the moulting process in arthropods. In aquatic species, the moulting fluid is released into the aqueous environment, and chitobiase activity present therein can be used to follow the dynamics of arthropod populations. Here, chitobiase activity was used for monitoring the impact of mosquito candidate Larvicides on Daphnia pulex and Daphnia magna under laboratory conditions. Both species were exposed to spinosad (2, 4, 8 μg L(-1)) and diflubenzuron (0.2, 0.4, 0.8 μg L(-1)) for 14 days. Bacillus thuringiensis var. israelensis (Bti; 0.25, 0.5, 1 μL L(-1)) was used as the reference Larvicide. Chitobiase activity, adult survival, individual growth and fecundity, expressed as the number of neonates produced, were measured every 2 days. Average Exposure Concentrations of spinosad were ten-fold lower than the nominal concentrations, whereas only a slight deviation was observed for diflubenzuron. In contrast to Bti, spinosad and diflubenzuron significantly affected both species in terms of adult survival, and production of neonates. As compared to D. pulex, D. magna was more severely affected by diflubenzuron, at low and medium concentrations, with reduced adult growth and much lower chitobiase activity. Chitobiase activity was positively correlated with the individual body length, number of neonates produced between two consecutive observation dates, and number of females and neonates. In addition, the significant positive correlations between chitobiase activity measured on the last sampling date before the first emission of neonates and the cumulative number of neonates produced during the whole observation period strongly support the potential of the activity of this chitinolytic enzyme as a proxy for assessing the dynamics of arthropod populations exposed to Larvicides used for mosquito control.
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influence of environmental factors on the response of a natural population of daphnia magna crustacea cladocera to spinosad and bacillus thuringiensis israelensis in mediterranean coastal wetlands
Environmental Pollution, 2010Co-Authors: Claire Duchet, Th Caquet, Evelyne Franquet, Christophe Lagneau, Laurent LagadicAbstract:Abstract The present study was undertaken to assess the impact of a candidate mosquito Larvicide, spinosad (8, 17 and 33 μg L −1 ) on a field population of Daphnia magna under natural variations of water temperature and salinity, using Bti (0.16 and 0.50 μL L −1 ) as the reference Larvicide. Microcosms (125 L) were placed in a shallow temporary marsh where D. magna was naturally present. The peak of salinity observed during the 21-day observation period may have been partly responsible for the decrease of daphnid population density in all the microcosms. It is also probably responsible for the absence of recovery in the microcosms treated with spinosad which caused a sharp decrease of D. magna abundance within the first two days following treatment whereas Bti had no effect. These results suggest that it may be difficult for a field population of daphnids to cope simultaneously with natural (water salinity and temperature) and anthropogenic (Larvicides) stressors.
Christophe Lagneau - One of the best experts on this subject based on the ideXlab platform.
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chitobiase activity as an indicator of altered survival growth and reproduction in daphnia pulex and daphnia magna crustacea cladocera exposed to spinosad and diflubenzuron
Ecotoxicology and Environmental Safety, 2011Co-Authors: Claire Duchet, Evelyne Franquet, Christophe Lagneau, Marilia Mitie Inafuku, Thierry Caquet, Michel Larroque, Laurent LagadicAbstract:Chitobiase is involved in exoskeleton degradation and recycling during the moulting process in arthropods. In aquatic species, the moulting fluid is released into the aqueous environment, and chitobiase activity present therein can be used to follow the dynamics of arthropod populations. Here, chitobiase activity was used for monitoring the impact of mosquito candidate Larvicides on Daphnia pulex and Daphnia magna under laboratory conditions. Both species were exposed to spinosad (2, 4, 8 μg L(-1)) and diflubenzuron (0.2, 0.4, 0.8 μg L(-1)) for 14 days. Bacillus thuringiensis var. israelensis (Bti; 0.25, 0.5, 1 μL L(-1)) was used as the reference Larvicide. Chitobiase activity, adult survival, individual growth and fecundity, expressed as the number of neonates produced, were measured every 2 days. Average Exposure Concentrations of spinosad were ten-fold lower than the nominal concentrations, whereas only a slight deviation was observed for diflubenzuron. In contrast to Bti, spinosad and diflubenzuron significantly affected both species in terms of adult survival, and production of neonates. As compared to D. pulex, D. magna was more severely affected by diflubenzuron, at low and medium concentrations, with reduced adult growth and much lower chitobiase activity. Chitobiase activity was positively correlated with the individual body length, number of neonates produced between two consecutive observation dates, and number of females and neonates. In addition, the significant positive correlations between chitobiase activity measured on the last sampling date before the first emission of neonates and the cumulative number of neonates produced during the whole observation period strongly support the potential of the activity of this chitinolytic enzyme as a proxy for assessing the dynamics of arthropod populations exposed to Larvicides used for mosquito control.
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influence of environmental factors on the response of a natural population of daphnia magna crustacea cladocera to spinosad and bacillus thuringiensis israelensis in mediterranean coastal wetlands
Environmental Pollution, 2010Co-Authors: Claire Duchet, Th Caquet, Evelyne Franquet, Christophe Lagneau, Laurent LagadicAbstract:Abstract The present study was undertaken to assess the impact of a candidate mosquito Larvicide, spinosad (8, 17 and 33 μg L −1 ) on a field population of Daphnia magna under natural variations of water temperature and salinity, using Bti (0.16 and 0.50 μL L −1 ) as the reference Larvicide. Microcosms (125 L) were placed in a shallow temporary marsh where D. magna was naturally present. The peak of salinity observed during the 21-day observation period may have been partly responsible for the decrease of daphnid population density in all the microcosms. It is also probably responsible for the absence of recovery in the microcosms treated with spinosad which caused a sharp decrease of D. magna abundance within the first two days following treatment whereas Bti had no effect. These results suggest that it may be difficult for a field population of daphnids to cope simultaneously with natural (water salinity and temperature) and anthropogenic (Larvicides) stressors.
