Two-Phase Uptake of Nickel in the Ground Beetle <Emphasis Type="Italic">Pterostichus oblongopunctatus</Emphasis> (Coleoptera: Carabidae): Implications for Invertebrate Metal Kinetics |
| |
Authors: | Agnieszka J Bednarska Anna Brzeska Ryszard Laskowski |
| |
Institution: | 1.Institute of Environmental Sciences,Jagiellonian University,Kraków,Poland |
| |
Abstract: | We studied nickel (Ni) kinetics in the ground beetle Pterostichus oblongopunctatus exposed to different, potentially stressful, temperatures. We found unexpected Ni kinetics in metal-exposed adult and larval
beetles. Instead of the pattern observed commonly for other metals, i.e., an increase in metal concentration followed by stabilisation
in the uptake phase and a decrease after transfer to uncontaminated food, the Ni-fed beetles apparently switched to decontamination
soon after the start of Ni exposure while they were still being fed Ni-spiked food. In addition, internal body Ni concentrations
showed high variance. The traditional first-order, one-compartment model with the switch to decontamination set to the last
day of the uptake phase appeared inadequate and in most cases was nonsignificant. Instead, the model with a regression-estimated
point of switching to decontamination fit the data better, explaining 57.2–91.5% of the temporal variability of mean Ni body
concentrations (weighted regression) in adult beetles and 44.1–62.3% in larvae. Temperature did not affect Ni toxicokinetics
in adults, but in larvae there were some temperature-dependent differences in kinetic parameters. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|