Augusto Sofia, Máguas Cristina, Branquinho Cristina
Faculty of Sciences, Centre for Environmental Biology (CBA), University of Lisbon, Campo Grande, Bloco C2, Piso 5, 1749-016, Lisbon, Portugal.
Ecotoxicology. 2009 Nov;18(8):1036-42. doi: 10.1007/s10646-009-0360-z. Epub 2009 Jul 10.
The aim of this study was to compare the performance of two lichen species--Xanthoria parietina and Ramalina canariensis--as biomonitors of the toxic organic compounds dioxins and furans (PCDD/Fs). For that purpose, the concentrations and profiles of PCDD/Fs found in samples of these two lichen species were compared. Results showed that R. canariensis presented higher concentrations than X. parietina and that the PCDD/F homologue profiles were substantially different between these species. Xanthoria parietina appeared to be a more efficient interceptor of more chlorinated PCDD/Fs and also of particles, whereas R. canariensis mainly reflected less chlorinated PCDD/Fs. Results also showed that the PCDD/F profile of X. parietina differed from the one found in other foliose and fruticose lichen species. Despite the differences observed between the profiles of R. canariensis and X. parietina, the calibration of PCDD/F concentrations between the two species was achieved, allowing the biomonitoring of PCDD/Fs at a regional scale using both species simultaneously.
本研究的目的是比较两种地衣物种——石黄衣（Xanthoria parietina）和加那利树花（Ramalina canariensis）——作为有毒有机化合物二噁英和呋喃（PCDD/Fs）生物监测器的性能。为此，对这两种地衣物种样本中发现的PCDD/Fs浓度和分布情况进行了比较。结果表明，加那利树花中的浓度高于石黄衣，且这两个物种之间的PCDD/F同系物分布情况存在显著差异。石黄衣似乎对更多氯代PCDD/Fs以及颗粒物具有更高的截留效率，而加那利树花主要反映的是氯代程度较低的PCDD/Fs。结果还表明，石黄衣的PCDD/F分布情况与其他叶状和枝状地衣物种不同。尽管加那利树花和石黄衣的分布情况存在差异，但实现了两个物种之间PCDD/F浓度的校准，从而能够同时使用这两个物种在区域尺度上对PCDD/Fs进行生物监测。
