Effects of Zinc Accumulation on Earthworm Aporrectodea caliginosa (Haplotaxida: Lumbricidae)

S. M. Mahmood, Adnan Musa Mohammed
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Abstract

Earthworms are key to the earth's ecosystem, which helps the soil increase its fertility and repair its existing elements, as well as remove contaminants. This study investigated the accumulation of Zn in the earthworm Aporrectodea caliginosa after 15 days of exposure. The worms were grown in media with different concentrations of Zn between 750 and 1500 ppm. Each treatment consisted of three replicates, containing 30 worms. A control group without Zn was also used. Data were analyzed by using Duncan Multi–Range. The results revealed that A. caliginosa had a strong ability to accumulate Zn in its tissue compared to the control group. It was noticed that the increase of the heavy metal in the worm´s tissue is associated with the elevation of the metal in its media. The results show a significant loss of weight in the worm´s body and loss in the growth rate; they also shown a decrease in specific growth rate. Moreover, there was a significant decrease in the worm length, showing a high effect, especially after 15 days of breeding with all concentrations used in this study. The researchers recommend using earthworms to purify the soil from contaminants because earthworm has a great ability to get rid of all pollutants, whether metals or pesticides or parasites, especially in industrialized countries and agricultural lands.
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锌积累对caliginosa Aporrectodea的影响(单轴纲:蚓科)
蚯蚓是地球生态系统的关键,它帮助土壤提高肥力,修复现有的元素,以及去除污染物。本研究研究了暴露15 d后,蚯蚓体内锌的积累情况。这些蠕虫生长在锌浓度在750到1500 ppm之间的培养基中。每个处理包括3个重复,每重复30只虫。另设不加锌对照组。采用Duncan Multi-Range对数据进行分析。结果表明,与对照组相比,绿藻在组织中积累锌的能力较强。我们注意到,蚯蚓组织中重金属含量的增加与其介质中重金属含量的升高有关。结果表明:虫体体重明显减轻,生长速度下降;它们也显示出特定增长率的下降。此外,虫长明显减少,效果显著,特别是在本研究使用的所有浓度繁殖15天后。研究人员建议使用蚯蚓来净化土壤中的污染物,因为蚯蚓有很强的能力去除所有污染物,无论是金属、杀虫剂还是寄生虫,尤其是在工业化国家和农业用地。
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