| predator cues magnify effects of the pesticide endosulfan in water bugs in a multi-species test in outdoor containers. | pesticides have become major stressors in many aquatic communities. laboratory studies suggest their impact may be further magnified in the presence of cues from predators. despite their importance for ecological risk assessment, synergisms between pesticides and predator cues have not been confirmed under semi-natural outdoor conditions. we evaluated how the presence of predator cues and the presence of a non-corixid community affect the pesticide sensitivity of five water bug (corixidae) speci ... | 2013 | 23728356 |
| toxicity of lindane to freshwater insect larvae in compartments of an experimental pond. | the acute and chronic toxicities of lindane to larvae of the freshwater insects chironomus riparius meigen, chaoborus flavicans (meigen), and sigara striata (l.) were investigated in mesocosm compartments of an experimental pond. the following median lethal concentrations (lc50s) were determined: 240-hr lc50 of 2.0 micrograms lindane liter-1 for second instar c. riparius, 72-hr lc50 of 6.5 micrograms lindane liter-1 for fourth instar c. riparius, and 96-hr lc50s of 4.0 and 3.9 micrograms lindane ... | 1992 | 1375150 |
| the role of a water bug, sigara striata, in freshwater food webs. | freshwater food webs are dominated by aquatic invertebrates whose trophic relationships are often poorly known. here, i used laboratory experiments to study the role of a water bug, sigara striata, as a potential predator and prey in food webs of stagnant waters. multiple-choice predation experiment revealed that sigara, which had been considered mostly herbivorous, also consumed larvae of chironomus midges. because they often occur in high densities and are among the most ubiquitous aquatic ins ... | 2014 | 24883250 |