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首页> 外文期刊>Estuarine Coastal and Shelf Science >Spatio-temporal dynamics of a Zostera noltii dominated community over a period of fluctuating salinity in a shallow lagoon, Southern France
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Spatio-temporal dynamics of a Zostera noltii dominated community over a period of fluctuating salinity in a shallow lagoon, Southern France

机译：在法国南部一个浅泻湖中，在盐度波动的一段时间内，一个以Zostera noltii为主的群落的时空动态

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摘要

The consequences of a sudden decrease in water salinity on a macrophyte community dominated by the marine species Zostera noltii were investigated in a shallow coastal lagoon (Southern France). The expected change in the community assemblage was a competitive displacement of Z. noltii by Potamogeton pectinatus and Ruppia cirrhosa. However, the results of an eight-year survey did not validate this hypothesis. Zostera noltii remained dominant after three years at low salinity (ca. 5) and then suddenly disappeared within one year. The decline of Z. noltii was not associated with an increase of other species. The maximum depth colonized by all species decreased, suggesting that light availability became a limiting factor for the aquatic vegetation. The high concentration in suspended sediments that was measured when salinity was low may result from the synergetic effects of low salinity that slowed down the settling of suspended sediments and the disappearance of Z. noltii meadow that trapped sediments and reduced wave energy. The progressive recovery of the Z. noltii meadow following the increase in water salinity was associated with an increase in depth limit of the other species. However, the two other angiosperms remained present at low frequency of occurrence and the two charophytes (Lamprothamnium papulosum and Chara galioides) declined over the study period. A geo-referenced database was constructed to investigate the spatial variation in Zostera noltii cover in relation to depth, slope, wave exposure and sediment characteristics using logistic regressions. During the first years of re-colonization, when Z. noltii was restricted to the shallow borders of the lagoon with the highest slope values, the best explanatory variables were depth and slope. In the following years, depth and wave exposure were the most important factors determining the spatial distribution of Z. noltii.
机译：在一个浅水沿海泻湖（法国南部）调查了水盐度突然下降对以海洋物种Zostera noltii为主的大型植物群落的影响。群落组成的预期变化是果蝇（Potamogeton pectinatus）和桔梗（Ruppia cirrhosa）对诺氏疟原虫的竞争性替代。但是，一项为期八年的调查结果并未证实这一假设。低盐度（约5年）后的三年中，左旋Zostera仍然占主导地位，然后在一年之内突然消失。 Z. noltii的减少与其他物种的增加无关。所有物种定居的最大深度减少，这表明光的可利用性已成为水生植被的限制因素。盐度低时测得的悬浮沉积物中高浓度可能是由于低盐度的协同效应所致，该协同效应减慢了悬浮沉积物的沉降速度，并降低了捕获沉积物并降低波能的Z. noltii草甸的消失。随着水盐度的增加，Z。noltii草甸的逐步恢复与其他物种的深度极限的增加有关。但是，在研究期间，另外两个被子植物仍然以低发生率存在，并且两个藻类（Lamprothamnium papulosum和Chara galioides）下降。建立了一个地理参考数据库，使用逻辑回归研究了Zostera noltii覆盖物在深度，坡度，波浪暴露和沉积物特征方面的空间变化。在重新定殖的最初几年中，当诺特氏菌被限制在泻湖的浅边界且斜率值最高时，最好的解释变量是深度和斜率。在随后的几年中，深度和波浪暴露是决定结缕草空间分布的最重要因素。

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