Abstract

The content of mercury in adult water beetles is studied in beaver ponds located in the Polist-Lovat Swamp System (Novgorod oblast). A total of 201 individuals of nine species of the family Dytiscidae and one species of the family Hydrophilidae (size classes II and III) are studied. It is revealed that the mercury content in beetles of size class II differs significantly between species (χ² = 32.93, p < 0.01). Maximum concentrations were found in Graphoderus cinereus (0.259 ± 0.091 µg/g dry weight), while minimum concentrations were recorded in Hydrochara caraboides (0.091 ± 0.020 µg/g dry weight). There were no significant differences in the mercury content between the III size class beetles (largest beetles) of the studied species. In beetles of size class II, the concentration of mercury decreases in the body with an increase in the body weight (Kendall rank coefficient τ = –0.31, p < 0.01). The mercury content in the body parts of beetles of the genus Dytiscus increases in order: the elytra and wings-legs-head and thorax-abdomen.

中文翻译：

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不同大小等级的水甲虫（鞘翅目：Dy科，亲水科）中的汞含量

摘要

在Polist-Lovat沼泽系统（诺夫哥罗德州）的海狸池塘中研究了成年甲虫中的汞含量。总共研究了201个个体，它们分别属于9个科的纲科和1个亲水科的纲（II级和III级）。据透露，在尺寸类物种之间不同II的显著甲虫的汞含量（χ ² = 32.93，p <0.01）。发现最大浓度的是半绒线虫（Graphoderus cinereus）（0.259 ±0.091 µg / g干重），而最小浓度的水生糖藻（0.091±0.020 µg / g干重）。在所研究物种的III级甲虫（最大的甲虫）之间，汞含量没有显着差异。在II级大小的甲虫中，体内汞的浓度随着体重的增加而降低（肯德尔等级系数τ= –0.31，p <0.01）。Dytiscus属甲虫的身体部位中的汞含量按顺序增加：鞘翅，翅翅，双腿，头部和胸腹部。