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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Population specific salinity tolerance in eelgrass (Zostera marina)
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Population specific salinity tolerance in eelgrass (Zostera marina)

机译：鳗草种群的特定盐度耐受性

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摘要

Salinity is one of the main factors impacting distribution of marine plants and sub-optimal salinities may result in increased resource use and decreased production. We studied the performance and salinity tolerance of eelgrass (Zostera marina L.) originating from two regions with different ambient salinities: a low saline (salinity 6) and a high saline (salinity 20) population. Plants from both populations were exposed to a series of fixed salinities (2,4, 6,9,12.5,15,20 and 25) for 5 weeks. Both plant origin and salinity affected plant performance significantly. Plant production decreased with decreasing salinity in both populations, while mortality increased in low salinity only in plants originating from the high saline population. The better performance of the low saline population in the lowest salinities indicates a horizontal shift in salinity tolerance among populations with different origin and that the low saline population is better adapted to hyposaline conditions. Despite the long-term adaptation of the low saline population to stable, low salinity, these plants were still able to function normally in high salinities, indicating remarkable plasticity. The results further suggest that altered salinity can severely impact seagrass productivity but responses might vary significantly depending on plant origin. Such variability in stress tolerance indicates that some populations have better chances to survive in and adapt to future changes in environment.
机译：盐度是影响海洋植物分布的主要因素之一，次佳盐度可能导致资源利用增加和产量下降。我们研究了鳗鱼（Zostera marina L.）的性能和耐盐性，其起源于两个环境盐度不同的区域：低盐度（盐度6）和高盐度（盐度20）种群。来自这两个种群的植物暴露于一系列固定的盐度（2,4,6,9,12.5,15,20和25）持续5周。植物来源和盐度均显着影响植物性能。两个种群中的植物产量都随着盐度的降低而降低，而低盐度的死亡率仅在高盐度种群的植物中增加。低盐度种群在最低盐度条件下的更好性能表明，在不同来源的种群中，盐度耐受性发生了水平变化，并且低盐度种群更适合于次盐碱条件。尽管低盐种群能够长期适应稳定的低盐度，但这些植物仍能够在高盐度下正常运行，这表明其具有可塑性。结果进一步表明，盐度的变化会严重影响海草的生产力，但其响应可能会因植物来源而有很大差异。压力耐受性的这种可变性表明某些人群有更好的机会生存并适应未来的环境变化。

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