Effects of cadmium on life-cycle parameters in a multi-generation study with Chironomus riparius following a pre-exposure of populations to two different tributyltin concentrations for several generations.

摘要: So far only a few studies have been performed to assess the effects of dynamic pollutant exposure on life-history parameters invertebrates. In previous multi-generation approach with midge Chironomus riparius we tested if chronic tributyltin pre-exposure alters ability population cope subsequent cadmium stress. experiment two separate chironomid populations were exposed via sediments different TBT-concentrations (4.46 and 8.93 μg Sn/kg dw) for several generations, followed by (1.2 mg Cd/kg three generations. While TBT-exposure 4.46 dw had small development reproduction C. higher TBT-concentration led negative traits. Therefore, adverse effect thus susceptibility other stressors could be assumed. Within, this paper results second stressor presented; clear Cd determined independent scenario. no differences in Cd-sensitivity found between without TBT pre-exposed low dw), midges (8.93 resulted significantly Cd-stress. These document that history may influence reaction altered chemical Our findings are relevant understand predict evolutionary fate rapidly changing, human-impacted environments. However, fact chemical-induced reduced genetic diversity, which is not necessarily linked adaptation, leads fitness under stress conditions, our knowledge novel finding.