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首页> 外文期刊>Estuarine Coastal and Shelf Science >Freshwater inflows and seasonal forcing strongly influence macrofaunal assemblages in Mediterranean coastal lagoons
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Freshwater inflows and seasonal forcing strongly influence macrofaunal assemblages in Mediterranean coastal lagoons

机译：淡水的流入和季节性强迫对地中海沿岸泻湖的大型动物群产生了强烈影响

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Coastal lagoons of the Ebro Delta (Catalonia, Spain) are part of the Ebro Delta Natural Park managed by regional government authorities. Coastal lagoons have persistently received freshwater inputs from the Ebro River from May to November that have altered their natural ecology and hydrological cycle. In this study, we evaluate the seasonal effect of contrasting salinity regimes (polyhaline in the Tancada lagoon, mesohaline in the Encanyissada and oligohaline in the Clot lagoon) on the composition, abundance, species richness, alpha diversity and biomass of benthic macrofauna communities, and we assess the relative contribution of local environmental variables to the observed patterns. Additional sampling was conducted in the largest lagoon (Encanyissada) in order to assess variability at lower spatial scale. At both spatial scales (i.e., among-lagoon and within-lagoon), species richness and diversity tended to increase at higher salinities, particularly in summer. At the assemblage level, significantly different groupings were also found among lagoons and among zones of the Encanyissada lagoon, with more distinctive differences also in summer. Environmental factors accounted for up to 56-60% of the variation in macrofaunal assemblages at both spatial scales, with salinity and temperature accounting for the largest contributions (approx. 14% and 10%, respectively), whereas biomass was mostly controlled by temperature and nutrients. Distinctive oxygen and organic matter levels across the lagoons were also associated with the freshwater influx and displayed significant contributions to observed patterns. Our study shows that the low salinity regime and/or other factors related to long-term inputs of freshwater shape the community of macrofauna within the lagoons, a central trophic resource for most of the local species of fish and aquatic birds. Restoration of these systems to their natural hydrological functioning without further inputs of freshwater and higher marine connectivity is suggested as the more appropriate management.
机译：埃布罗三角洲（西班牙加泰罗尼亚）的沿海泻湖是埃布罗三角洲自然公园的一部分，由地区政府当局管理。从五月到十一月，沿海泻湖一直从埃布罗河获得淡水输入，从而改变了它们的自然生态和水文循环。在这项研究中，我们评估了不同盐度制度（坦卡达泻湖中的多卤水，恩卡尼耶萨达中的中盐和克洛特泻湖中的低盐度）对底栖大型动物群落的组成，丰度，物种丰富度，α多样性和生物量的季节性影响。我们评估了局部环境变量对观测模式的相对贡献。在最大的泻湖（Encanyissada）中进行了额外采样，以评估较低空间尺度上的变异性。在两个空间尺度上（即泻湖间和泻湖内），盐度较高时物种丰富度和多样性趋于增加，特别是在夏季。在集合水平上，泻湖之间和恩卡尼萨达泻湖区域之间也发现了显着不同的分组，夏季也有更明显的差异。在两个空间尺度上，环境因素最多占大型动物群落变化的56-60％，其中盐度和温度贡献最大（分别约为14％和10％），而生物量主要受温度和温度控制。营养。整个泻湖中独特的氧气和有机物含量也与淡水涌入有关，对观察到的模式有重要贡献。我们的研究表明，低盐度和/或与长期淡水投入有关的其他因素影响了泻湖内大型动物的群落，泻湖是大多数当地鱼类和水生鸟类的主要营养资源。建议将这些系统恢复其自然水文功能，而无需进一步输入淡水和提高海洋连通性，这是更合适的管理方法。

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