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(M/MF182) Influence of chronic pollution metal on survival of carabid beetles exposed to additional intoxication. Kramarz, Paulina1, Ryszard, Laskowski1, Zygmunt, Piotr1, Stone, Dave2, Wojewodzic, Marcin1, 1 2 ABSTRACT- The carabid beetles, Pterostichus oblongopunctatus, originating from five sites located along a metal pollution gradient (from 150 to 10500 mg Zn kg-1, 136 to 2600 mg Pb kg-1, and 0.84 to 81.9 mg Cd kg-1) were exposed in the laboratory to one of the three toxicants of different mode of action: two pesticides (imidacloprid and dimethoate) and zinc. Imidacloprid was applied in contact test on sand (10 mg a.i. kg-1), dimethoate was dosed topically at the rate of 0.1 Key words: carabide, metals, pesticides, survival |
g a.i. beetle -1, and zinc was applied through an artificially contaminated food at a concentration of 5000 mg kg-1. The beetles collected at the most contaminated sites were significantly more susceptible to all three toxicants than those originating from the reference site. The median survival times of the dimethoate-treated beetles were 12 and 123 hours for the two most polluted sites compared to 359 hours for the reference site. For imidacloprid treatment, the median survival times ranged from 46 at the most polluted site and 6 h at the next polluted site to 189 hours for the reference population. Corresponding data for zinc were 75 and 57 days to 89 days. The results indicate that the beetles living in chronically polluted environment were more susceptible to additional intoxication with different chemicals, including zinc which is one the main pollutants in the region.