Foraminiferal communities from three stations on the French Mediterranean coast to test density separation methods

the data present foraminiferal counts from three stations sampled between the 2nd and the 8th april 2015. these data were collected as part of the water framework directive (wfd) survey on the french mediterranean coast (dce4-1 campaign). the primary use of these foraminiferal data is to evaluate the environmental quality of coastal environment of the french mediterranean coast. more particularly these data were used to test the efficiency of density separation methods to extract foraminifera from sandy samples in biomonitoring studies.a reineck box-corer was used to sampled surface sediment and at each station three replicates were taken (i.e., different box-corer launch). each replicate was sub-cored (7.45 cm diameter) and the top 0-1 centimetre was stained with rose bengal at 2 g.l-1 and preserved in 96% ethanol. in the laboratory samples were washed through 63, 125, 150, and 500 µm sieves. the 125–150 µm and the 150–500 µm fractions were both split in two with a folsom wet splitter. different density separation methods were applied on each split. these density separations were carrying out using different high-density liquids (i.e., tce: trichloroethylene; zc: zinc chloride; spt: sodium polytungstate), at different density (i.e., 1.46, 1.7, 2.1, 2.3, and 2.5). in the database, the sample volume corresponds to the total volume of sediment in millilitre before sieving, and the split volume corresponds to the volume of each split in millilitre. see parent et al. 2018 for a full description of the method.

本数据集包含了2015年4月2日至4月8日期间于三个站点采集的浮游有孔虫计数数据。这些数据系法国地中海沿岸（DCE4-1项目）水资源框架指令（WFD）调查的一部分而收集。这些浮游有孔虫数据的初步用途在于评估法国地中海沿岸海岸环境的生态环境质量。具体而言，这些数据被用于检验密度分离法在生物监测研究中从沙样中提取有孔虫的效率。采用Reineck箱式取样器采集表层沉积物，并在每个站点进行三次重复取样（即，不同的箱式取样器投放）。每个重复样本进一步进行子取样（直径7.45厘米），其顶部0-1厘米部分用2 g.l-1的玫瑰红B染色，并保存在96%的乙醇中。在实验室中，样品通过63、125、150和500微米的筛子进行洗涤。125-150微米和150-500微米的组分均使用Folsom湿式分离器分成两份。对每个分离组分应用不同的密度分离方法，这些分离操作使用不同密度的重液体（例如，三氯乙烯；氯化锌；偏钨酸钠），密度分别为1.46、1.7、2.1、2.3和2.5。在数据库中，样品体积对应于筛分前的总沉积物体积（以毫升为单位），而分离体积则对应于每个分离分量的体积（以毫升为单位）。关于方法的详细描述，请参阅Parent等（2018）的研究。