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首页> 外文期刊>Environmental toxicology and chemistry >RECOVERY OF KNOWN-AGE HYALELLA AZTECA (AMPHIPODA) FROM SEDIMENT TOXICITY TESTS
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RECOVERY OF KNOWN-AGE HYALELLA AZTECA (AMPHIPODA) FROM SEDIMENT TOXICITY TESTS

机译:从沉积物毒性测试中回收已知年龄的阿兹台克人(两栖动物)

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摘要

Recovery of 1-, 7-, 14-, or 21-d-old Hyalella azteca from sediment was evaluated. Recovery of 1- and 7-d-old amphipods was below an acceptability criterion of 80% survival for sediment tests. Another important aspect to consider when conducting sediment tests with H. azteca is defining mortality. A second study was conducted to evaluate the decomposition rate of dead amphipods in sediment. Regardless of sediment type, ≥90% of the amphipods started to break apart within 12 h of death; specifically, the head separates from the body. Therefore, if an immobile amphipod with its head and body intact is recovered in sieved material, it was probably alive within 12 h of the end of the test (an amphipod may be alive before sieving but may die during the sieving process). However, immobile amphipods removed from the sediment surface before sieving are known to be dead.
机译:评估了从沉积物中回收1、7、14或21日龄的透明质Hyalella azteca的能力。对于沉积物测试,回收一维和七维的两栖动物的存活率低于存活率80%的可接受标准。用阿兹台克人进行沉积物测试时要考虑的另一个重要方面是确定死亡率。进行了第二项研究,以评估沉积物中死脚足纲动物的分解速率。不论沉积物的类型如何,≥90%的两栖类动物在死亡后12小时内就会开始分裂;特别是,头部与身体分开。因此,如果在筛分的物料中恢复了其头部和身体完整的不动的两足动物,则它可能在测试结束后的12小时内还活着(两栖动物在筛分前可能还活着,但在筛分过程中可能会死亡)。然而,已知在筛分之前从沉积物表面除去的固定两足动物已经死亡。

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