Fall 2006 crab population monitoring: mid-marsh and creek bank abundance based on crab hole counts at GCE marsh, monitoring sites 1-10

This data set is the Fall 2006 estimate of crab densities at the GCE-LTER marsh sites used for population monitoring. Crab abundance was determined by counting the number of crab holes within a 625 cm^2 quadrat and converting the counts to number per square meter. Counts were made in the mid-marsh and creek bank zones (n = 4 per zone) at GCE sites 1 through 10. This method does not differentiate which species made a particular hole and therefore only estimates total crab abundance. Plugged holes were excluded from the counts. Mean density across all sites and zones was 342 m^-2 (+/- 355 s.d.).

本数据集为2006年秋季针对用于种群监测的GCE-LTER沼泽样地的螃蟹密度估算结果。螃蟹丰度通过统计625平方厘米（cm²）样方（quadrat）内的蟹洞数量，并将计数结果换算为每平方米的个体数得到。统计工作在GCE 1至10号样地的沼泽中带与溪岸带两个生境带内开展，每个生境带设置4个重复样点（n=4）。该方法无法区分单个蟹洞的所属物种，因此仅能估算螃蟹总丰度。已封堵的蟹洞不计入本次统计。所有样地及生境带的平均螃蟹密度为342只/平方米（±355 s.d.）。