Macoma balthica survival

This file contains the average Macoma balthica survival at each site sampled during the field survey in 2004. Survival is calculated as the average density in the fall sampling divided by the average sampling in the spring at each site. River represents the river the sample was taken in, Site represents the site name, Date represents the date the sample was taken. The average DO represents the average dissolved oxygen concentration (mg O2/L) during the summer months observed at each site during that year. Site locations and raw DO measurements are available in the Sites and physical measurements files, and the raw densities are available in the Macoma balthica densities file.本文件收录了2004年野外调查中各采样点位的白樱蛤（Macoma balthica）平均存活率。存活率的计算方式为各点位秋季采样的平均密度除以春季采样的平均密度。其中，字段River代表采样所在河流，Site代表点位名称，Date代表采样日期。平均溶解氧（Dissolved Oxygen，简称DO）指当年夏季各观测点位的平均溶解氧浓度，单位为mg O2/L。点位坐标与原始溶解氧测定数据可从《点位与物理测定文件》中获取，原始密度数据则可从《白樱蛤（Macoma balthica）密度文件》中调取。