Predatory aquatic beetles, suitable trace elements bioindicators
Predatory aquatic beetles, suitable trace elements bioindicators
复制标题
DOI：
10.1039/c1em10016e
复制
发表时间：
2011-05-01
影响因子：
--
通讯作者：
Palanca-Soler, Antonio
中科院分区：
文献类型：
--
作者：
Burghelea, Carmen I.;Zaharescu, Dragos G.;Palanca-Soler, Antonio
捕食性水生甲虫是自然和管理的水生环境中常见的殖民者。虽然作为水生食物网的重要组成部分，它们很容易积累微量元素，但它们在很大程度上被金属吸收研究所忽视。本研究旨在探讨微小水螅虫Hydroglyphus pusillus、微小乳杆菌Laccophilus minutus和中缘水螅虫Rhantus suturalis作为微量元素（Al、As、Cd、Co、Cu、Fe、Mn、Mo、Ni、Pb、Se和Zn）生物指示剂的适宜性。这项工作是在一个代表稻田和控制点（水库）的案例区进行的，该案例区来自一个以土地退化而闻名的干旱地区（西班牙东北部的莫内斯托）。分类主成分分析（CATPCA）进行了测试，作为一种非线性的方法，以确定显着的金属，物种和栖息地条件之间的关系，以检查这些物种的能力，以反映在金属吸收的差异。除Se和As外，稻田中甲虫体内其他元素的平均浓度均高于对照生境。CATPCA确定H. pusillus有很高的能力，积累铁，镍和锰，无论栖息地类型，因此可能无法区分栖息地条件方面的这些金属。另一方面，L. minutus被发现不敏感的硒在非管理的栖息地（即。e.水库），而R.中绒蒿对稻田中Al、Mo、Pb的富集效果较好。后者似乎是一个很有前途的生物指示剂的金属富集在稻田。我们的结论是，捕食性水生甲虫是很好的候选人微量元素生物指示在受影响和非受影响的环境，可用于环境监测研究。CATPCA被证明是一种可靠的方法，可以根据水生无脊椎动物的生境状况揭示其金属积累趋势。
Predatory aquatic beetles are common colonizers of natural and managed aquatic environments. While as important components of the aquatic food webs they are prone to accumulate trace elements, they have been largely neglected from metal uptake studies. We aim to test the suitability of three dytiscid species, i.e. Hydroglyphus pusillus, Laccophilus minutus and Rhantus suturalis, as trace elements (Al, As, Cd, Co, Cu, Fe, Mn, Mo, Ni, Pb, Se and Zn) bioindicators. The work was carried out in a case area representing rice paddies and control sites (reservoirs) from an arid region known for its land degradation (Monegros, NE Spain). Categorical principal component analysis (CATPCA) was tested as a nonlinear approach to identify significant relationships between metals, species and habitat conditions so as to examine the ability of these species to reflect differences in metal uptake. Except Se and As, the average concentrations of all other elements in the beetles were higher in the rice fields than in the control habitats. The CATPCA determined that H. pusillus had high capacity to accumulate Fe, Ni and Mn regardless of the habitat type, and hence may not be capable of distinguishing habitat conditions with regards to these metals. On the other hand, L. minutus was found less sensitive for Se in non-managed habitats (i. e. reservoirs), while R. suturalis was good in accumulating Al, Mo and Pb in rice fields. The latter seems to be a promising bioindicator of metal enrichment in rice fields. We conclude that predatory aquatic beetles are good candidates for trace elements bioindication in impacted and non-impacted environments and can be used in environmental monitoring studies. CATPCA proved to be a reliable approach to unveil trends in metal accumulation in aquatic invertebrates according to their habitat status.