Back to Search
Start Over
Variation in toxicity of a current-use insecticide among resurrected Daphnia pulicaria genotypes.
- Source :
-
Ecotoxicology (London, England) [Ecotoxicology] 2015 Apr; Vol. 24 (3), pp. 488-96. Date of Electronic Publication: 2014 Dec 07. - Publication Year :
- 2015
-
Abstract
- This study examined how genotypes of Daphnia pulicaria from a single population, separated by thousands of generations of evolution in the wild, differ in their sensitivity to a novel anthropogenic stressor. These genotypes were resurrected from preserved resting eggs isolated from sediments belonging to three time periods: 2002-2008, 1967-1977, and 1301-1646 A.D. Toxicity of the organophosphate insecticide chlorpyrifos was determined through a series of acute toxicity tests. There was a significant dose-response effect in all genotypes studied. Moreover, significant variation in toxicity among genotypes within each time period was detected. Importantly, a significant effect of time period on sensitivity to chlorpyrifos was found. Analysis of the median effect concentrations (EC50s) for genotypes within each time period indicated that the 1301-1646 genotypes were 2.7 times more sensitive than the 1967-1977 genotypes. This trend may be partially explained by microevolutionary shifts in response to cultural eutrophication.
Details
- Language :
- English
- ISSN :
- 1573-3017
- Volume :
- 24
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Ecotoxicology (London, England)
- Publication Type :
- Academic Journal
- Accession number :
- 25481822
- Full Text :
- https://doi.org/10.1007/s10646-014-1397-1