Fall 2011 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 2011 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2011年秋季针对GCE-LTER沼泽监测站点开展的螃蟹种群密度估算结果，该站点用于螃蟹种群监测。螃蟹种群丰度通过统计625平方厘米样方（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。本次计数工作覆盖GCE第1至10号站点的沼泽中部与河岸带，每个区域设置4个重复样方（n = 4 per zone）。该方法无法区分单个蟹洞对应的螃蟹物种，因此仅能估算总螃蟹种群丰度。计数过程中排除了被封堵的蟹洞。