A risk assessment of pollution: Induction of atrazine tolerance in phytoplankton communities in freshwater outdoor mesocosms, using chlorophyll fluorescence as an endpoint
Seguin, F; Le Bihan, F; Leboulanger, C; Bérard, A
HERO ID
11145513
Reference Type
Journal Article
Year
2002
Language
English
PMID
| HERO ID | 11145513 |
|---|---|
| In Press | No |
| Year | 2002 |
| Title | A risk assessment of pollution: Induction of atrazine tolerance in phytoplankton communities in freshwater outdoor mesocosms, using chlorophyll fluorescence as an endpoint |
| Authors | Seguin, F; Le Bihan, F; Leboulanger, C; Bérard, A |
| Journal | Water Research |
| Volume | 36 |
| Issue | 13 |
| Page Numbers | 3227-3236 |
| Abstract | We investigated the validity and sensitivity of assessments of the induction of atrazine tolerance in freshwater outdoor mesocosmic phytoplankton communities, using the in vivo fluorescence of chlorophyll a as an endpoint, for monitoring ecotoxicology and for risk assessment programs applied to phytoplankton contaminated by photosystem II herbicides. Atrazine inhibits the photosynthetic process. and so the rise in in-vivo fluorescence could be used as a physiological manifestation of acute toxicity. Short-term tests (I h) were used, in which increasing concentrations of the herbicide were applied to phytoplankton samples taken every two days from the mesocosms, and used to plot dose-response curves. The concentration at which atrazine increased the fluorescence by 25% relative to control samples was used to demonstrate the sensitivity of the phytoplankton, and the values found were compared for samples from different mesocosms (contaminated and non-contaminated). The taxonomic composition of the phytoplankton was also determined. The data showed that chronic exposure (25 days) to 30 mug/L of atrazine significantly increased the apparent tolerance of the phytoplankton to further contamination by the same compound. The use of in vivo fluorescence of chlorophyll a appears to be a reliable and effective parameter for monitoring the effects of atrazine pollution, and detecting the changes in community tolerance driven by pollution selection pressure. |
| Doi | 10.1016/S0043-1354(02)00013-1 |
| Pmid | 12188119 |
| Wosid | WOS:000177441400007 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |
| Keyword | risk assessment; aquatic mesocosm; herbicide; phytoplankton community tolerance; fluorescence |
| Is Peer Review | Yes |