Experimental evidence associates burrowing behavior of Castalia ambigua (Bivalvia: Hyriidae) with shell shape and density

Information on freshwater mussel behavior in the sediment is scarce worldwide, especially in the Amazon. Laboratory experiments were used to measure the responses of the single mussel species Castalia ambigua in relation to combinations of two co-occurring different morphotypes (Morphotype I with an elongated shell and Morphotype II with a rounded shell), and three different densities (4, 8 and 16 mussels). Horizontal movements (cm) were calculated by summing changes in the position of each specimen and the shell exposure at the sediment-water interface was obtained by measuring (mm) the exposed part of the shell. Castalia ambigua presented different patterns of shell exposure and horizontal movements linked with shell shape and density. Castalia ambigua Morphotype I remained less exposed with 4 mussels. In contrast, this morphotype was more exposed and tended to aggregate in treatments with 8 and 16 mussels, similar to observations of Morphotype II at all densities. Morphotype II is ma..., This dataset was collected by direct observations of freshwater mussel movements in aquaria. The data were processed as described in the README file., Non-proprietary format: LibreOffice; Microsoft Excel; other spreadsheet applications.

全球范围内关于淡水贻贝在沉积物中的行为研究资料极为匮乏，亚马逊流域的相关研究尤其稀缺。
本研究采用室内受控实验，测定了单一贻贝物种卡斯塔利雅蚌（Castalia ambigua）对两种同域共存的不同壳型（壳型I：壳体修长；壳型II：壳体圆润）以及三种密度梯度（4、8、16只贻贝）组合的行为响应。
水平移动距离（单位：厘米）通过累加各观测个体的位置变化量计算得到；沉积物-水界面处的壳体暴露度，则通过测量壳体暴露部分的尺寸（单位：毫米）获取。
卡斯塔利雅蚌的壳体暴露模式与水平移动特征随壳型和密度呈现显著差异：当密度为4只时，壳型I个体的壳体暴露程度更低；与之相反，在密度为8只和16只的处理组中，该壳型个体的暴露程度更高，且表现出聚集倾向，这与所有密度下壳型II的观测结果一致。壳型II则……
本数据集通过对水族箱内淡水贻贝移动行为的直接观测采集所得，数据处理方式详见配套README文件。
数据集采用非专有格式，可使用LibreOffice、Microsoft Excel及其他电子表格软件读取。