| how does crop type influence risk from pesticides to the aquatic environment? | national-level risk mapping was undertaken to identify specific situations within england with the greatest potential for impacts on aquatic biodiversity from normal agricultural use of pesticides. calculations of exposure via spray drift and drainflow were differentiated by landscape type, region, and crop and then compared with toxicity to the indicator organisms daphnia magna and algae. the approach incorporated regional-level information regarding pesticide usage derived from farm visits. ri ... | 2007 | 17702541 |
| potential impacts of water injection dredging on water quality and ecotoxicity in limehouse basin, river thames, se england, uk. | the use of water injection dredging (wid) is increasing in the uk's inland waterways and marinas. jets of water are injected under low pressure directly into bottom sediment creating a turbulent water-sediment mixture that flows under the influence of gravity. many of these sediments are highly contaminated and little is known of the effects of contaminant release on water quality or the risk to biota living in both the sediment and the water column. sediment cores were collected from limehouse ... | 2006 | 16271380 |
| toxicity characterisation of organic contaminants in stormwaters from an agricultural headwater stream in south east england. | the transient movement of pesticides at biologically active concentrations during storm events is considered to be a cause of biological impoverishment in some headwater streams. the programme of work described sought to identify compounds that are the cause of toxic effects during such events. along with targeted pesticide analysis, toxicity identification evaluation (tie) procedures were used to identify compounds with a demonstrated toxic effect. these procedures were specifically directed to ... | 2001 | 11394775 |