双壳类贝壳可以在一个地质时期内持续存在，是相关动物的重要物理资源。但是，很少有研究调查它们作为生态系统持久的长期生态属性的相关性。因此，研究处于不同环境条件下的河流系统中的壳腐烂是很重要的。为此目的，有四个双壳类的壳（Anodonta anatina，Corbicula fluminea，Potomida littoralis和Unio delphinus））被选中。可以单独使用，也可以使用不同大小的群集提供外壳。通过记录全年在lentic和lotic生境中贝壳的腐烂率，评估了河流流量和季节变化的影响。我们的结果表明，腐烂在物种之间是不同的，并且取决于壳的大小，水流量和季节。薄壳物种（甲。anatina和ü。海豚）显示每月衰变，3.17％（激流）和2.77％（激流）的最高平均百分比，分别和厚壳物种（Ç。蚬和P。沙参）最低，分别为2.02％（常规）和1.83％（常规）。尺寸是解释衰变的一个相关变量，最小的壳体代表最高的值，是其他尺寸类别的1.2-2.0倍。同样，鲁棒性被证明是解释厚壳物种衰变的最重要特征。河流流量也是腐烂的一个相关描述，与透镜状生境相比，在抽水中观察到了更高的腐烂。此外，主要在夏季（片状部位）和秋天（胶状部位）观察到较低的腐烂，这与叶片的埋葬效应有关。总之，原生物种A的壳。anatina和ü。三角洲预计将持续存在，并且作为栖息地工程物种的贡献少于本地P的壳。叶树和入侵物种Ç。氟胺。这对于衰落率比透镜状生境高出2.13倍的抽水生境尤其有效。
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Decay and persistence of empty bivalve shells in a temperate riverine system
Bivalve shells can persist over a geological time, acting as important physical resources to the associated fauna. However, few studies have investigated their relevance as persistent long-term ecological attributes to the ecosystem. As such, it is relevant to investigate the shell decays in riverine systems subjected to different environmental conditions. Towards this end, shells of four bivalve species (Anodonta anatina, Corbicula fluminea, Potomida littoralis and Unio delphinus) were selected. Shells were made available individually and in clusters of different sizes. The effects of river flow and seasonality were assessed by recording the decay rates of shells in lentic and lotic habitats throughout the year. Our results evidenced that the decays varied among species and depend on shell size, water flow and season. Thin shelled species (A. anatina and U. delphinus) showed the highest mean percentage of decay per month, 3.17% (lotic) and 2.77% (lotic), respectively, and thick shelled species (C. fluminea and P. littoralis) the lowest, 2.02% (lotic) and 1.83% (lotic), respectively. Size was a relevant variable explaining decays, with the smallest shells presenting the highest values, 1.2–2.0 times higher compared to the other size classes. Also, robustness showed to be the most relevant feature explaining the decays in thick shelled species. River flow was also a relevant descriptor of the decays, with higher decays observed in the lotic compared to the lentic habitats. Furthermore, lower decays were observed mainly during summer (lentic site), and autumn (lotic site) associated to the burial effect of leaves. In summary, shells of the native species A. anatina and U. delphinus are expected to persist and contribute less as habitat engineering species, than shells of the native P. littoralis and invasive species C. fluminea. This is especially valid to lotic habitats that the decays were up to 2.13 times higher than in lentic habitats.