The extent of metal pollution in the sediment of Osinmo reservoir was determined with a view to assessing the impact of heavy metal concentrations on the community assemblage of the macroinvertebrates there-in. The range of the mean concentrations of heavy metals are as follows: Pb (6.66–7.89 mg/kg), Cu (1.04–2.63 mg/kg), Mn (34.03–61.69 mg/kg), Zn (3.59–8.17 mg/kg) and Ni (0.08–0.1 mg/kg).The mean concentration of the investigated heavy metals in the reservoir sediment followed the order Mn > Pb > Zn > Cu > Ni. Insignificant variation of the heavy metals was observed amidst the three reaches of the reservoir except for Mn which showed a significant difference (p < 0.05). Although the insect groups were generally more sensitive to the sediment parameters than the noninsect group, the community assemblage was observed not to have been significantly impacted by these variations. The values obtained from enrichment analysis of the metals were generally lower than the background values and this indicated that a significant portion of the heavy metals in the sediment was derived from natural sources thus suggesting the existence of a stable ecological community in the Reservoir.

中文翻译：

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微量金属污染及其对热带水库大型无脊椎动物群落组成的影响

确定Osinmo水库沉积物中金属污染的程度，以评估重金属浓度对其中大型无脊椎动物群落组成的影响。重金属的平均浓度范围如下：铅（6.66-7.89 mg / kg），铜（1.04-2.63 mg / kg），锰（34.03-61.69 mg / kg），锌（3.59-8.17 mg / kg kg）和Ni（0.08–0.1 mg / kg）。储层沉积物中所研究的重金属的平均浓度遵循Mn> Pb> Zn> Cu> Ni的顺序。在储层的三个区域观察到重金属的变化很小，但Mn表现出显着差异（p <0.05）。尽管昆虫组通常比非昆虫组对沉积物参数更敏感，但观察到群落组合并未受到这些变化的显着影响。从金属富集分析获得的值通常低于背景值，这表明沉积物中很大一部分重金属来自自然资源，因此表明水库中存在稳定的生态群落。