Crab population monitoring: Fall 2001 mid-marsh and creekbank crab abundances based on hole counts at GCE marsh, monitoring sites 1-10

This data set is the first Fall 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 creekbank zones (n = 4 per zone) at all sites. 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 (+/- 158 s.d.).

本数据集为用于种群监测的GCE-LTER沼泽样地的首次秋季蟹类密度估算结果。蟹类丰度通过统计625平方厘米样方（quadrat）内的蟹洞数量，并将计数结果转换为每平方米的个体数得以确定。所有样地均在沼泽中部与溪岸带（creekbank zone）开展计数，每个区域设置4个重复样方。该方法无法区分单个蟹洞的造洞物种，因此仅能估算蟹类总丰度。计数过程中排除了被封堵的蟹洞。所有样地及样带的平均蟹类密度为342只/平方米（m⁻²，标准差±158，s.d.）。