Salinity tolerance of riverine microinvertebrates from the southern Murray–Darling Basin
Salinity tolerance of riverine microinvertebrates from the southern Murray–Darling Basin
复制标题
墨累-达令盆地南部河流微型无脊椎动物的耐盐性
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
D. Nugegoda
中科院分区：
文献类型：
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作者：
B. Kefford;Elizabeth J. Fields;Colin J. Clay;D. Nugegoda
由于担心盐度上升对淡水生物多样性的影响，人们开始研究大型无脊椎动物和鱼类的耐盐性，而对微型无脊椎动物的关注较少。我们调查了急性致死的影响，盐度对12种微型无脊椎动物的河流在南部的墨累达令盆地中部维多利亚，澳大利亚。对于这些物种的一个子集，亚致死盐度的影响和水温对耐盐性的影响也进行了研究。最敏感的微型无脊椎动物有大致相似的72小时LC 50值最敏感的大型无脊椎动物，在其他研究报告。然而，最宽容的微型无脊椎动物测试更敏感，比最宽容的大型无脊椎动物和微型无脊椎动物的研究比大多数淡水鱼更敏感。温度对盐度的急性致死毒性有影响，但影响程度很小。在四个物种中的三个（绿色水螅除外），在浓度低于其72小时LC 50值时，观察到盐度对生长、发育和/或生殖的影响。然而，不同的端点对盐度的反应不同。盐度对微型无脊椎动物的影响有可能间接影响鱼类和耐盐的大型无脊椎动物，通过改变其猎物物种或微型无脊椎动物的生态功能。
Concern about the effect of rising salinity on freshwater biodiversity has led to studies investigating the salt tolerance of macroinvertebrates and fish, with less attention given to microinvertebrates. We investigated the acute lethal effects of salinity on 12 microinvertebrate species from rivers in the southern Murray–Darling Basin in central Victoria, Australia. For a subset of these species, sub-lethal salinity effects and the effect of water temperature on salinity tolerance were also investigated. The most sensitive microinvertebrates had broadly similar 72-h LC50 values to the most sensitive macroinvertebrates, reported in other studies. However, the most tolerant microinvertebrates tested were much more sensitive than the most tolerant macroinvertebrates and the microinvertebrates studied were more sensitive than most freshwater fish. Temperature affected the acute lethal toxicity of salinity but only to a small degree. In three of four species (the exception being Hydra viridissima), the effects of salinity on growth, development and/or reproduction at concentrations below their 72-h LC50 values were observed. However, different endpoints responded differently to salinity. The demonstrated effect of salinity on microinvertebrates has the potential to indirectly affect fish and salt-tolerant macroinvertebrates via changes to their prey species or ecological functions performed by microinvertebrates.