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首页> 外文期刊>Estuarine Coastal and Shelf Science >Modelling large-scale effects of estuarine and morphodynamic gradients on distribution and abundance of the sandy beach isopod Excirolana armata
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Modelling large-scale effects of estuarine and morphodynamic gradients on distribution and abundance of the sandy beach isopod Excirolana armata

机译：河口和形态动力学梯度对沙滩等足类Excirolana armata分布和丰度的大规模影响建模

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Understanding the relationships between beach morphodynamics and macrofauna assemblages has been critical in theoretical evolution of sandy beach ecology. However, macroscale studies that consider the concurrent effects of large-scale estuarine and morphodynamic gradients have been exceptional. The present study evaluates the combined effects of large-scale (>400 km) salinity and morphodynamics on the distribution of Excirolana armata. Along a salinity gradient (from 0.10 to 34.30) generated by the Rio de la Plata estuary (SW Atlantic Ocean), sixteen Uruguayan sandy beaches were analyzed over a two-year period. A conditional two-step procedure using a General Additive Model (2-step GAM) was performed in order to model occurrence (1st-step) and abundance (2nd-step) of E. armata, in relation to salinity, grain size, sand moisture, compaction and organic matter of the sand, slope, beach and swash width, and water and sediment temperature. The 1st-step GAM retained 6 physical descriptors in the model (decreasing order): mean grain size, organic matter, salinity, beach width, sand moisture and water temperature. The 2nd-step GAM showed that mean grain size, salinity, sand moisture, beach width, sand compaction and organic matter were the most important explanatory variables (in decreasing order) of abundance. Mean grain size was the main predictor in both models, suggesting an important substrate specificity of E. armata towards smallest grain sizes. A meta-analysis concerning large-scale variation in abundance of E. armata in sandy beaches of the Rio Grande ecoregion (28°S-35°S) of the Warm-Temperate Southwestern Atlantic Province gave compelling evidence of this high-substrate specificity of the E. armata. Salinity was also a key factor shaping patterns in occurrence and abundance, which increased from low to intermediate/high salinities (>20), reinforcing the notion of ￡. armata as a marine species with relatively high tolerance to estuarine conditions. The potential role that internal brooding gives for protection of offspring to osmotic stress is discussed.
机译：了解沙滩形态动力学与大型动物群落之间的关系对于沙滩生态学的理论发展至关重要。然而，考虑到大规模河口和形态动力学梯度的同时影响的宏观研究是例外的。本研究评估了盐度（> 400 km）和形态动力学对卷柏Excirolana分布的综合影响。沿着里约热内卢河口（西南大西洋）产生的盐度梯度（从0.10到34.30），在两年的时间内对16个乌拉圭沙滩进行了分析。使用通用添加剂模型（两步GAM）进行了有条件的两步过程，以便针对盐度，晶粒度，沙度来模拟棉铃虫的发生（第一步）和丰度（第二步）。水分，沙子的压实度和有机质，坡度，海滩和斜流宽度以及水和沉积物温度。第一步GAM在模型中保留了6个物理指标（降序）：平均粒度，有机物，盐度，海滩宽度，沙子湿度和水温。第二步GAM结果表明，平均粒度，盐度，沙子水分，海滩宽度，沙子压实度和有机质是丰度最重要的解释变量（降序排列）。在两个模型中，平均晶粒尺寸是主要的预测指标，表明棉铃虫对最小晶粒尺寸具有重要的底物特异性。一项关于暖温带西南大西洋省里奥格兰德州生态区（28°S-35°S）沙滩中大肠埃希菌丰度大规模变化的荟萃分析提供了令人信服的证据，证明了这种高底物特异性E. armata。盐度也是影响发生率和丰度的关键因素，它从低盐度增加到中/高盐度（> 20），强化了the的概念。军械库是对河口条件具有较高耐受性的海洋物种。讨论了内育对保护后代免受渗透胁迫的潜在作用。

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