Transfer of selected metals along simplified food chains of ultramafic ecosystem in Mpumalanga Province, South Africa
Transfer of selected metals was studied along the food chains: soil;Ni-hyperaccumulating plant Berkheya coddii (Asteraceae);herbivores: chewing beetle Chrysolina pardalina (Chrysomelidae) and Holcolaccus sp. (Curculionidae);a sap feeder Protaphis pseudocardui (Aphididae). Predators were the bug Rhynocoris navii (Reduviidae) and the jumping spider Pachyballus sp. (Salticidae). Metal balances were based on ICP and AAS measurements. Micro-PIXE was used for construction of quantitative elemental maps of the bodies. Herbivores coped well with the excess of Ni and the bioaccumulation factor (BAF) for Ni was the lowest in the aphid, followed by C. pardalina. The BAF of metals in predators was prey-dependent, except for Mn. The average levels of metals in both herbivores and predators were maintained within physiological limits typical for species inhabiting nonultramafic ecosystems, thus demonstrating adaptive strategies to utilize Ni hyperaccumulating plant species in their food chains. This observation was confirmed by micro-PIXE elemental mapping.
Berkheya coddii Chrysolina pardalina micro-PIXE Ni-hyperaccumulation Protaphis pseudocardui Rhynocoris navii salticid spider
J. Mesjasz-Przybylowicz P. Migula W. J. Przybylowicz M. Augustyniak M. Nakonieczny E. Orlowska
Materials Research Group, iThemba LABS, P. O. Box 722, Somerset West 7129, South Africa Department of Animal Physiology and Ecotoxicology, University of Silesia, Bankowa 9, 40-007 Katowice Materials Research Group, iThemba LABS, P. O. Box 722, Somerset West 7129, South Africa Faculty of P
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
1020-1022
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）