Life-history effects of arsenic toxicity in clades of the earthworm Lumbricus rubellus
Life-history effects of arsenic toxicity in clades of the earthworm Lumbricus rubellus
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DOI：
10.1016/j.envpol.2012.09.005
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发表时间：
2013-01-01
影响因子：
8.9
通讯作者：
Spurgeon, D. J.
中科院分区：
文献类型：
--
作者：
Anderson, C. J.;Kille, P.;Spurgeon, D. J.
暴露的蚯蚓rubellus在土壤中的一系列砷浓度被用来评估生命阶段（少年，成人）和基因型特异性的敏感性，计算人口增长率（λ）和评估模式的砷积累。在125毫克/公斤砷的青少年中观察到显著的死亡率，而生长和成熟受到36毫克/公斤及以上的影响。在成虫中，最高浓度（125毫克/千克）的蚕茧产量显著降低。通过比较线粒体序列进行系统发育分析，以建立青少年之间的基因型变异。三个分支超过7.5%的分歧，描述了70%的蚯蚓属于一个单一的分支。日期和质量在成熟的分支之间有显着差异，但分支没有差异作为敏感。参数λ在36毫克/千克砷时降低，在125毫克/千克砷时为负值，表明在环境相关浓度下的影响和种群稳定性以及潜在灭绝。(C)2012爱思唯尔有限公司保留所有权利。
Exposures of Lumbricus rubellus to a series of arsenic concentrations in soil were used to assess life-stage (juvenile, adult) and genotype specific sensitivities, to calculate population growth rate (lambda) and to assess patterns of As accumulation. Significant mortality was seen in juveniles at 125 mg/kg As, while growth and maturation was affected from 36 mg/kg and above. In adults, cocoon production at the highest concentration (125 mg/kg) was significantly reduced. Phylogenetic analysis was performed by comparison of mitochondrial sequences to establish genotypic variation among juveniles. Three clades with more than 7.5% divergent were described, with 70% of earthworms belonging to a single clade. Date of and mass at maturation was significantly different between clades, but clades were not differentially As sensitive. Parameter lambda was reduced at 36 mg/kg As and was negative at 125 mg/kg As, suggesting impacts and population stability and potential extinction at environmentally relevant concentrations. (C) 2012 Elsevier Ltd. All rights reserved.