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Is sediment mud content a significant predictor of macrobenthos abundance in low-mud-content tidal flats?

机译：底泥含量是否是低泥浆含量滩涂中大型底栖动物丰度的重要预测指标？

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Sediment mud content is a significant predictor of macrobenthos abundance in marine soft-bottom habitats. However, the mechanisms behind the non-linearity generally shown in mud—macrobenthos relationships have not been examined. The present study analysed spatial distributions of sediment properties and macrobenthos in a tidal flat system of the north-east coast of Japan and tested the hypothesis: the non-linearity of mud—macrobenthos relationship corresponds to changes in bed elevation variability and sediment cohesiveness. For two macrobenthos species studied, Nuttallia olivacea (Bivalvia) and Hediste spp. (Polychaeta), the relationships between mud content (<75 μm) and their density showed discontinuities at —0.1% % and 20% mud contents. In stations with <0.1% mud content, the densities of both species were related positively to mud content and negatively to bed elevation variability, suggesting that mud content reflected negative effects of bed elevation variability on macrobenthos abundance. The stations where distinct changes were observed in macrobenthos densities below or above 20% mud content were within an area where a shift between non-cohesive and cohesive sediments was found. Hence, the results of the present study support the hypothesis and also suggest that sediment mud content can be a sensitive predictor of macrobenthos abundance even within a relatively low and narrow range of mud content.
机译：沉积物泥浆含量是海洋软底生境中大型底栖动物丰度的重要预测指标。但是，通常未显示在泥浆-巨无伦氏关系中的非线性背后的机理。本研究分析了日本东北海岸的一个潮滩系统中的沉积物特征和大型底栖动物的空间分布，并验证了这一假设：泥浆－巨人层关系的非线性对应于床高程变化和沉积物凝聚力的变化。对于研究的两个大型底栖动物物种，Nuttallia olivacea（双壳纲）和Hediste spp。 （Polychaeta），泥浆含量（<75μm）与其密度之间的关系显示出在-0.1％％和20％泥浆含量处的不连续性。在泥浆含量＜0.1％的站点中，两种物种的密度与泥浆含量呈正相关，与床层高程变化呈负相关，这表明泥浆含量反映了床层高程变化对大型底栖动物丰度的负面影响。在低于或高于20％泥浆含量的大型底栖动物密度中观察到明显变化的站位于发现非粘性沉积物和粘性沉积物之间转移的区域内。因此，本研究的结果支持该假设，并且还表明，即使在相对较低且较窄的泥浆含量范围内，沉积物泥浆含量也可以作为大型底栖动物丰度的敏感预测指标。

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