Fall 2012 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 2012 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.

本数据集为2012年秋季针对GCE-LTER沼泽监测站点的蟹类密度估算成果，该站点群用于蟹类种群监测。蟹类丰度通过计数625平方厘米样方内的蟹洞数量，并将统计结果换算为每平方米的蟹类个体数得到。计数工作覆盖GCE第1至10号站点的沼泽中部与河岸带区域，每个区域设置4个重复样方（n=4）。该方法无法区分单个蟹洞的归属物种，仅能估算蟹类总丰度。已封堵的蟹洞不计入统计范围。