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Salt tolerance and survival thresholds for two species of Antarctic soil nematodes

机译：两种南极土壤线虫的耐盐性和生存阈值

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摘要

We evaluated the response of the Antarctic soil nematodes Scottnema lindsayae and Plectus antarcticus to various salts (NaCl, MgSO_4, KNO_3 and NaCl + MgSO_4) and salt concentrations in prepared salt solutions ranging from 0.1 to 3 M, and in saturation paste extracts of soils collected from multiple locations where nematode abundance varied from zero to numerous, and where electrical conductivity ranged from 108 to > 12,000 μS/cm. Nematode salt tolerance was salt specific; both nematode species survived in low-experimental concentrations of NaCl and MgSO_4, and neither species survived in KNO_3 solutions of any concentration. There was no survival of nematodes in the saturation paste extracts of highly saline soils (4,100 μS/ cm), while survival was over 80-97% in less saline soils (1,945 μS/cm). A 1:1 dilution of these highly saline saturation paste extracts increased S. lindsayae survival to 80%, while survival of P. antarcticus was not observed until dilutions of greater than 200%. The results complement previous studies demonstrating niche partitioning of S. lindsayae and P. antarcticus across salinity gradients and strengthen interpretations of the physiological mechanisms underlying previously reported spatial correlation between soil salinity and nematodes abundance in the Antarctic Dry Valleys.
机译：我们评估了南极土壤线虫Scottnema lindsayae和南极Plectus对各种盐（NaCl，MgSO_4，KNO_3和NaCl + MgSO_4）的盐浓度和制备的盐溶液（浓度范围为0.1至3M）和饱和泥浆提取物中盐浓度的响应。线虫的丰度从零变化到许多，电导率从108到> 12,000μS/ cm不等。线虫的耐盐性是盐特异性的。两种线虫物种均在低实验浓度的NaCl和MgSO_4中存活，而两种物种均未在任何浓度的KNO_3溶液中存活。高盐度土壤（4,100μS/ cm）的饱和糊状提取物中没有线虫的存活率，而盐分较少的土壤（1,945μS/ cm）的存活率超过80-97％。这些高盐饱和糊状提取物的1：1稀释将林丹链球菌的存活率提高到80％，而直到稀释度大于200％时才观察到南极疟原虫的存活率。结果补充了先前的研究，这些研究表明了盐度梯度上S. lindsayae和P. antarcticus的生态位分配，并加强了对先前报道的南极干旱河谷土壤盐度和线虫丰度之间空间相关的生理机制的解释。

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