Differential tolerance to ultraviolet-B light and photoenzymatic repair in cladocerans from a Chilean lake
Differential tolerance to ultraviolet-B light and photoenzymatic repair in cladocerans from a Chilean lake
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智利湖泊枝角动物对 UV-B 光的差异耐受性和光酶修复
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
L. Zúñiga
中科院分区：
文献类型：
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作者：
R. Ramos‐Jiliberto;Patricia Dauelsberg;L. Zúñiga
在本研究中，评估了四种共存枝角类物种对紫外线 (UV)-B 辐射的敏感性。首先，通过仅将枝角类动物暴露于不同剂量的UV-B光来计算抑制光酶修复作用的条件下的LD50。另一个治疗组的动物同时暴露在 UV-B 和可见光下，从而进行光酶修复。光酶修复对所有枝角动物类群对 UV-B 光的总耐受程度都有显着贡献，尽管贡献的大小因物种而异。当不允许光酶修复时，最耐受的物种是 Moina micrura，其次是 Daphnia ambigua 和 Ceriodaphnia dubia，其中 Diaphanosoma chilense 是最敏感的物种。在允许光修复作用的条件下，M. micrura 再次成为对 UV-B 光耐受性最强的物种。 Ceriodaphnia dubia表现出中等的耐受性，而D. chilense和D. ambigua是耐受性最差的物种，它们之间没有显着差异。在有和没有光修复的条件下，C. dubia 的成虫和幼虫对 UV-B 光的敏感性不同。
In the present study, the sensitivity of four coexisting cladoceran species to ultraviolet (UV)-B radiation was evaluated. First, the LD50 under conditions inhibiting the action of photoenzymatic repair was calculated by exposing cladocerans to different doses of UV-B light only. Animals in another treatment group were exposed to both UV-B and visible light, which allows for photoenzymatic repair. Photoenzymatic repair contributed significantly towards the degree of total tolerance to UV-B light in all groups of cladocerans, although the magnitude of the contribution varied among species. When no photoenzymatic repair was allowed, the most tolerant species was Moina micrura, followed by Daphnia ambigua and Ceriodaphnia dubia, with Diaphanosoma chilense being the most sensitive species. Under conditions permitting the action of photorepair, M. micrura was again the most tolerant species to UV-B light. Ceriodaphnia dubia showed an intermediate tolerance value, whereas D. chilense and D. ambigua were the least tolerant species, with no significant differences between them. Adults and juveniles of C. dubia differed in their sensitivity to UV-B light under conditions with and without photorepair.