Are calcitic layers an effective adaptation against shell dissolution in the Bivalvia?
Are calcitic layers an effective adaptation against shell dissolution in the Bivalvia?
复制标题
DOI：
10.1111/j.1469-7998.2000.tb00602.x
复制
发表时间：
2000-06-01
影响因子：
2
通讯作者：
Harper, EM
中科院分区：
文献类型：
--
作者：
Harper, EM
基于试剂级盐的特性，传统观点认为，由方解石而不是文石构成外骨骼的生物体具有更强的抗溶解能力。然而，个别双壳类微结构的实验表明，其他因素，如晶体大小和有机基质的比例超过了组成矿物学在确定率壳损失在寒冷的沃茨。此外，壳材料的损失是最小的，对应于壳厚度的3-40 μ m的年度损失取决于微观结构。这些发现必须投怀疑的普遍持有的假设，方解石层添加到外壳的外部是一种适应溶解在全新世的文石海水。
Conventional wisdom, based on properties of reagent-grade salts, states that organisms which construct their exoskeletons from calcite rather than aragonite have a greater ability to resist dissolution. However, experiments on individual bivalve microstructures show that other factors such as crystal size and the proportion of organic matrix outweigh constituent mineralogy in determining the rate of shell loss in cold waters. Moreover, the loss of shell material was minimal, corresponding to an annual loss in shell thickness of 3-40 mu m depending on microstructure. These findings must cast doubt on the commonly held supposition that calcitic layers added to the outside of shells are an adaptation against dissolution in Holocene 'Aragonite' seawater.