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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Effects of salinity on leaf growth and survival of the Mediterranean seagrass Posidonia oceanica (L.) Delile
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Effects of salinity on leaf growth and survival of the Mediterranean seagrass Posidonia oceanica (L.) Delile

机译：盐度对地中海海草波塞冬草（L.）Delile叶片生长和存活的影响

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The main aim of this study was to estimate the effects of salinity variation on the Mediterranean seagrass Posidonia oceanica (L.) Delile and its attached epiphytes. Leaf growth and survival of this plant were tested in several short-term (15 days) mesocosms experiments under controlled conditions between February 2001 and November 2001. Plants collected from shallow meadows at Alicante (SE Spain), with an ambient salinity of 36.8-38.0 psu, were placed in tanks of 300 L with an additional overhead light and exposed to different salinity treatments (ranging from 25 to 57 psu) during 15 days. To estimate the mortality and growth recuperation, in some experiments shoots were returned to control salinity (38 psu). Leaf growth was measured in the laboratory where epiphytic fauna and flora were removed from leaves, with a razor blade, to determine their biomass. P. oceanica was negatively influenced by increased salinity. Shoots showed a significant decrease in growth and survival, whereas epiphyte biomass did not show a clear response because of their high variability. Maximum leaf growth occurred between 25 and 39 psu. In addition, plants suffered considerable mortality at salinities above 42 psu and below 29 psu, with 100% mortality at 50 psu. In salinities between 39 and 46 psu, surviving plants were able to regain their original growth rate when returned to normal seawater salinity (38 psu). These results suggest that P. oceanica is one of the most sensitive seagrasses to salinity increments it is more tolerant to salinity reductions (25.0-36.4 psu), perhaps due to the terrestrial origin of seagrasses.
机译：这项研究的主要目的是估计盐度变化对地中海海草波西多尼亚大洋洲（L.）Delile及其附属附生植物的影响。在2001年2月至2001年11月之间的受控条件下，在数个短期（15天）中观实验中测试了该植物的叶片生长和存活。从阿利坎特（西班牙西班牙）的浅草甸中采集的植物，环境盐度为36.8-38.0在15天之内，将psu置于300 L的水箱中，并带有额外的头顶灯，并进行不同的盐度处理（范围为25至57 psu）。为了估计死亡率和生长恢复，在某些实验中，将枝条恢复至控制盐度（38 psu）。在实验室中测量了叶片的生长，在实验室中用剃须刀从叶片上去除了附生动植物，以确定其生物量。盐度增加对海洋假单胞菌产生不利影响。枝条显示出生长和存活率的显着降低，而附生生物量由于其高变异性而未显示出明显的响应。最大的叶片生长发生在25至39 psu之间。另外，植物在高于42 psu和低于29 psu的盐度下遭受相当大的死亡率，而在50 psu时死亡率为100％。在39至46 psu的盐度下，当恢复到正常的海水盐度（38 psu）时，存活的植物能够恢复其原始生长速率。这些结果表明，P。oceanica是对盐分增加最敏感的海草之一，它对盐分降低（25.0-36.4 psu）的耐受性更高，这可能是由于海草的陆地起源。

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