The influence of light and habitat structure on the predation of Culex quinquefasciatus larvae by the common heteropteran water bug, Diplonychus （= Sphaerodema） annulatus, D. rusticus and Anisops bouvieri was assess...The influence of light and habitat structure on the predation of Culex quinquefasciatus larvae by the common heteropteran water bug, Diplonychus （= Sphaerodema） annulatus, D. rusticus and Anisops bouvieri was assessed in the laboratory. It was revealed that water bugs predate more in presence of light than in dark conditions. While A. bouvieri consumed more prey in structured conditions, D. annulatus and D. rusticus consumed more prey in open conditions. The selection of prey size as well as the respective numbers varied between predators and treatments significantly. Prey vulnerability （PV）, an indicator of predatory efficiency, was highest for D. annulatus, moderate for D. rusticus and low for A. bouvieri. Prey consumption and PV values under different treatment conditions indicate that for belostomatid water bugs D. annulatus and D. rusticus, the order of prey consumption under different habitat and light/dark combinations is light open 〉 dark open 〉 light vegetated 〉 dark vegetated. In the case of the backswimmer, A. bouvieri, the order of prey consumption appeared to be light structured 〉 dark structured 〉 light open 〉 dark open. These findings were consistent with resource-partitioning by water bug species sharing the same guild. If the observed results are extended to natural settings the efficiency of these predators in controlling mosquito populations will vary with the structural complexity of habitats and the intensity of light.展开更多
Objective:To determine biting bugs of Hemiptera families presenting in the county of Kashan.Methods:For this descriptive study,samples were collected from 17 locations of lentic and lotic waters,3 times for each.These...Objective:To determine biting bugs of Hemiptera families presenting in the county of Kashan.Methods:For this descriptive study,samples were collected from 17 locations of lentic and lotic waters,3 times for each.These specimens were identified by using a stereo microscope and morphological keys.Results:Out of 5535 specimens collected in three times of samplings,3024 specimens(54.6%)belonged to order Diptera,701 specimens(12.7%)belonged to Crustaceans,691 specimens(12.5%)belonged to Trichoptera,468 specimens(8.4%)belonged to Hemipetera,303 specimens(5.5%)belonged to Ephemeroptera,133 specimens(2.4%)belonged to Odonata,104 specimens(1.9%)belonged to Coleoptera,98 specimens(1.8%)belonged to Hydroacarina and 13 specimens(0.2%)belonged to Plecoptera.In this study,Families Corixidae,Notonectidae,Gerridae and Nepidae from Hemiptera order were identified 45.9%,26.9%,25.0%and 2.2%,respectively.Conclusions:These results lead to the conclusion that Hemiptera fauna is relatively rich in Kashan.More studies by entomologists and biologists are recommended to determine the benefits and damages of these insects on the environment.展开更多
文摘The influence of light and habitat structure on the predation of Culex quinquefasciatus larvae by the common heteropteran water bug, Diplonychus （= Sphaerodema） annulatus, D. rusticus and Anisops bouvieri was assessed in the laboratory. It was revealed that water bugs predate more in presence of light than in dark conditions. While A. bouvieri consumed more prey in structured conditions, D. annulatus and D. rusticus consumed more prey in open conditions. The selection of prey size as well as the respective numbers varied between predators and treatments significantly. Prey vulnerability （PV）, an indicator of predatory efficiency, was highest for D. annulatus, moderate for D. rusticus and low for A. bouvieri. Prey consumption and PV values under different treatment conditions indicate that for belostomatid water bugs D. annulatus and D. rusticus, the order of prey consumption under different habitat and light/dark combinations is light open 〉 dark open 〉 light vegetated 〉 dark vegetated. In the case of the backswimmer, A. bouvieri, the order of prey consumption appeared to be light structured 〉 dark structured 〉 light open 〉 dark open. These findings were consistent with resource-partitioning by water bug species sharing the same guild. If the observed results are extended to natural settings the efficiency of these predators in controlling mosquito populations will vary with the structural complexity of habitats and the intensity of light.
基金Supported by Social Determinants of Health Research Center and Department of Environmental Health of Kashan University of Medical Sciences(Grant No.80024).
文摘Objective:To determine biting bugs of Hemiptera families presenting in the county of Kashan.Methods:For this descriptive study,samples were collected from 17 locations of lentic and lotic waters,3 times for each.These specimens were identified by using a stereo microscope and morphological keys.Results:Out of 5535 specimens collected in three times of samplings,3024 specimens(54.6%)belonged to order Diptera,701 specimens(12.7%)belonged to Crustaceans,691 specimens(12.5%)belonged to Trichoptera,468 specimens(8.4%)belonged to Hemipetera,303 specimens(5.5%)belonged to Ephemeroptera,133 specimens(2.4%)belonged to Odonata,104 specimens(1.9%)belonged to Coleoptera,98 specimens(1.8%)belonged to Hydroacarina and 13 specimens(0.2%)belonged to Plecoptera.In this study,Families Corixidae,Notonectidae,Gerridae and Nepidae from Hemiptera order were identified 45.9%,26.9%,25.0%and 2.2%,respectively.Conclusions:These results lead to the conclusion that Hemiptera fauna is relatively rich in Kashan.More studies by entomologists and biologists are recommended to determine the benefits and damages of these insects on the environment.
