Long‐term increases in shell thickness in Elliptio complanata (Bivalvia: Unionidae) in the freshwater tidal Hudson River
Long‐term increases in shell thickness in Elliptio complanata (Bivalvia: Unionidae) in the freshwater tidal Hudson River
复制标题
哈德逊河淡水潮汐中的 Elliptio complanata（双壳纲：Unionidae）的壳厚度长期增加
DOI：
10.1111/fwb.13723
复制
发表时间：
2021
影响因子：
2.7
通讯作者：
Malcom, Heather M.
中科院分区：
文献类型：
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作者：
Strayer, David L.;Hamilton, Stephen K.;Malcom, Heather M.
淡水软体动物的外壳对环境和生态条件具有高度可塑性，这会影响生态相互作用和生态系统功能。我们测试了 1991 年至 2017 年哈德逊河淡水潮汐中的双壳类 Elliptio complanata 的相对外壳厚度的变化，这是一个水化学和捕食压力发生变化的时期。幼体（外壳长度 <20 毫米）和较大动物的外壳都大幅变大（约 100 毫米）。 10%–25%）并且在研究期间明显更重（对于给定的壳长度）。这与之前发表的哈德逊河非本地斑马贻贝 Dreissena polymorpha 的结果相似。研究期间贝壳厚度增加可以通过 pH 值、碱度和温度升高来解释，这增加了方解石饱和度并有利于碳酸钙贝壳的沉淀，以及对贝壳破碎捕食者更大捕食的反应。因为影响贝壳厚度的因素（例如碳酸钙饱和度以及捕食者的存在和丰度）许多湖泊和河流的贝壳厚度正在迅速变化，世界各地的淡水中也可能发生类似的贝壳厚度的巨大变化，影响生态相互作用和生态系统功能。
The shells of freshwater molluscs are highly plastic in response to environmental and ecological conditions, which can affect ecological interactions and ecosystem functioning.We tested for changes in relative shell thickness in the unionid bivalve Elliptio complanata in the freshwater tidal Hudson River over 1991–2017, a period of changing water chemistry and predation pressure.Shells of both juveniles (shells <20 mm long) and larger animals became substantially (c. 10%–25%) and significantly heavier (for a given shell length) over the study period. This parallels previously published results for the non‐native zebra mussel Dreissena polymorpha in the Hudson.Increased shell thickness during the study period could be explained by rising pH, alkalinity, and temperature, which increased calcite saturation and favoured the precipitation of calcium carbonate shells, as well as a response to greater predation by shell‐crushing predators.Because the factors that affect shell thickness (e.g. calcium carbonate saturation and presence and abundance of predators) are changing rapidly in many lakes and rivers, similar large changes in shell thickness may be occurring in fresh waters around the world, affecting ecological interactions and ecosystem functioning.