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首页> 外文期刊>中国昆虫科学：英文版 >Metal concentrations of insects associated with the South African Ni hyperaccumulator Berkheya coddii (Asteraceae)
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Metal concentrations of insects associated with the South African Ni hyperaccumulator Berkheya coddii (Asteraceae)

机译：与南非镍超富集者Berkheya coddii（菊科）相关的昆虫的金属浓度

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The high levels of some metals in metal hyperaccumulator plants may be transferred to insect associates. We surveyed insects collected from the South African Ni hyperaccumulator Berkheya coddii to document whole-body metal concentrations (Co, Cr, Cu, Mg, Mn, Ni, Pb, Zn). We also documented the concentrations of these metals in leaves, stems and inflorescences, finding extremely elevated levels of Ni (4 700-16 000 μg/g) and high values (5-34 μg/g) for Co, Cr, and Pb. Of 26 insect morphotypes collected from B. coddii, seven heteropterans, one coleopteran, and one orthopteran contained relatively high concentrations of Ni (＞ 500 μg/g). The large number of high-Ni heteropterans adds to discoveries of others (from California USA and New Caledonia) and suggests that members of this insect order may be particularly Ni tolerant. Nymphs of the orthopteran (Stenoscepa) contained 3 500 μg Ni/g, the greatest Ni concentration yet reported for an insect. We also found two beetles with elevated levels of Mg (＞ 2 800 μg/g), one beetle with elevated Cu (＞ 70 μg/g) and one heteropteran with an elevated level of Mn (＞ 200 μg/g). Our results show that insects feeding on a Ni hyperaccumulator can mobilize Ni into food webs, although we found no evidence of Ni biomagnification in either herbivore or carnivore insect taxa. We also conclude that some insects associated with hyperaccumulators can contain Ni levels that are high enough to be toxic to vertebrates.
机译：金属超富集植物中的某些高含量金属可能会转移给昆虫同伴。我们调查了从南非镍超富集者Berkheya coddii收集的昆虫，以记录全身金属浓度（Co，Cr，Cu，Mg，Mn，Ni，Pb，Zn）。我们还记录了叶片，茎和花序中这些金属的浓度，发现镍含量极高（4 700-16 000μg/ g），钴，铬和铅的含量极高（5-34μg/ g）。在从鳕鱼芽孢杆菌中收集到的26种昆虫形态中，有7种异翅类，一种鞘翅目和一种直翅类昆虫含有相对较高的Ni浓度（> 500μg/ g）。大量的高Ni异翅类动物增加了其他发现（来自美国加利福尼亚和新喀里多尼亚），这表明该昆虫纲的成员可能特别耐Ni。直翅目（Stenoscepa）的若虫含有3500μgNi / g Ni，这是昆虫报告的最大Ni浓度。我们还发现了两只甲虫的Mg含量（＞ 2 800μg/ g），一只甲虫的Cu含量（＞ 70μg/ g）和一只异萜类动物的Mn含量（＞ 200μg/ g）。我们的结果表明，尽管没有发现草食动物或食肉动物昆虫类群中镍具有生物放大作用的证据，但以镍超富集性为食的昆虫可以将镍迁移到食物网中。我们还得出结论，与高蓄积性有关的某些昆虫可能含有的镍含量很高，足以对脊椎动物产生毒性。

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