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首页> 外文期刊>Estuarine Coastal and Shelf Science >Influence of salinity regime on the food-web structure and feeding ecology of fish species from Mediterranean coastal lagoons
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Influence of salinity regime on the food-web structure and feeding ecology of fish species from Mediterranean coastal lagoons

机译：盐度对地中海沿岸泻湖鱼类网状结构和摄食生态的影响

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摘要

Dual δ~(15)N and δ~(13)C analyses and estimates of biomass were used to characterize the food webs of valuable fish species in three coastal lagoons of the Ebro Delta subjected to contrasting salinity regimes (polyhaline in the Tancada lagoon, mesohaline in the Encanyissada and oligohaline in the Clot lagoon). The δ~(13)C signatures of the entire food-web including primary producers, sediment organic matter and consumers showed the most enriched values in the Tancada lagoon (from approx. -4.8‰ in sediments to -19.7‰ in fish) and the most depleted ones in the Clot lagoon (from approx. -11.4‰ in sediments to -25.4‰ in fish), consistent with dominant contributions from marine and continental sources, respectively. For δ~(15)N, particularly high values were detected in the submersed vegetation (11.3 ± 03‰) together with more enriched sediment values at lower salinities (by approx. 2.5‰), suggesting that historical loadings of agricultural fertilizers are still retained by the systems and transmitted across trophic levels. Negative relationships between δ~(15)N and salinity were also observed for the amphipod Gammanis aequicauda and the isopod Sphaeroma hookeri, suggesting some consumption of accumulated and resuspended detrital material. In contrast, δ~(15)N signatures of fish showed lower values and inconsistent patterns, possibly because most species have a seasonal use of the lagoons. The biomass of fish species did not show a clear effect of the salinity regime (except for the mosquitofish Gambusia hol-brookii), but results for mixing models suggest a diet shift from higher contribution of zooplankton size fractions in the Encanyissada (from 57 to 73%) to macrofauna at the other lagoons (from 40 to 67%). We suggest that alterations in salinity might modify the trophic dynamics of the systems from benthic to planktonic pathways, without large-scale differences in 815N of fish suggestive of similar trophic levels.
机译：用双重δ〜（15）N和δ〜（13）C分析以及对生物量的估计来表征盐度不同的埃布罗三角洲三个沿海泻湖中有价值的鱼类的食物网（Tancada泻湖中的多卤水， Encanyissada中的美沙ha鱼和Clot泻湖中的低卤鱼）。整个食物网的δ〜（13）C标记，包括初级生产者，沉积物有机质和消费者，在Tancada泻湖中显示出最丰富的值（从沉积物中约-4.8‰到鱼类中-19.7‰），以及克洛特泻湖中最耗竭的污染物（从沉积物中的大约-11.4‰到鱼类中的-25.4‰），分别与海洋和大陆来源的主要贡献一致。对于δ〜（15）N，在淹没的植被中检测到特别高的值（11.3±03‰），而在较低盐度下（约2.5‰）的沉积物含量更高，这表明仍保留了历史上的农业肥料含量由系统传播并跨营养级传播。两栖类两足动物的γ-（15）N与盐度之间也存在负相关关系，这表明两足类食虫食虫钩虫消耗了一些积累和重悬的碎屑物质。相反，鱼类的δ〜（15）N特征值较低，且模式不一致，可能是因为大多数物种都季节性使用泻湖。鱼种的生物量没有显示出明显的盐度作用（除蚊鱼Gambusia hol-brookii除外），但是混合模型的结果表明，饮食从Encanyissada的浮游动物大小比例的较高贡献（从57变到73） ％）到其他泻湖的大型动物（40％至67％）。我们建议盐度的改变可能会改变系统的营养动力学，从底栖途径到浮游途径，而815N鱼类的大规模差异表明相似的营养水平。

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