Exploring the sulfide tolerance of ectosymbiotic Niphargus amphipods from the Frasassi caves, central Italy
Exploring the sulfide tolerance of ectosymbiotic Niphargus amphipods from the Frasassi caves, central Italy
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DOI：
10.5038/1827-806x.42.2.6
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发表时间：
2013-01-01
影响因子：
1.3
通讯作者：
Dattagupta, Sharmishtha
中科院分区：
文献类型：
--
作者：
Bauermeister, Jan;Assig, Karoline;Dattagupta, Sharmishtha
两种甲壳类片足动物属Niphargus栖息在意大利中部Frasassi洞穴的硫化物地下水中，都含有丝状的硫化物氧化Thiothrix外共生菌。由于硫化物对大多数好氧生物都是有毒的，因此外共生体似乎可以帮助它们的Niphargus宿主进行解毒过程。在这项研究中，由于硫化物的死亡率进行了比较Niphargus个体与外共生体和个体的外共生体已被杀死的抗生素治疗。这两个Frasassi-dwelling Niphargus物种发现异常高的耐受性硫化物相比，其他片脚类动物物种研究到目前为止。没有可行的外共生体的Niphargus个人容忍硫化物水平超过发生在Frasassi洞穴沃茨。因此，端足类动物可能采用不依赖Thiothrix的机制来抵抗硫化物。
Two species of the crustacean amphipod genus Niphargus inhabit the sulfidic groundwaters of the Frasassi caves in central Italy, and both harbor filamentous, sulfide-oxidizing Thiothrix ectosymbionts. As sulfide is toxic to most aerobic organisms, it appeared possible that the ectosymbionts could help their Niphargus hosts with detoxification processes. In this study, mortality due to sulfide was compared between Niphargus individuals with ectosymbionts and individuals whose ectosymbionts had been killed by antibiotic treatment. Both Frasassi-dwelling Niphargus species revealed exceptionally high tolerances to sulfide compared to other amphipod species studied so far. Niphargus individuals without viable ectosymbionts tolerated sulfide levels exceeding those occurring in Frasassi cave waters. Thus, the amphipods may employ Thiothrix-independent mechanisms for sulfide resistance.