Mollusc population size distribution monitoring: Fall 2008 mid-marsh and creekbank infaunal and epifaunal mollusc size distributions based on collections from GCE marsh monitoring sites 1-10

This data set is the Fall 2008 report of infaunal and epifaunal mollusc species' size distributions at the GCE-LTER marsh sites used for population monitoring. Infaunal and epifaunal molluscs were hand-collected from within quadrats of known area from mid-marsh and creekbank zones (n = 4 quadrats per zone) at all sites. The molluscs were returned to the lab, preserved in ethanol, measured and counted (count data is reported separately). Length of each measurable individual was determined using calipers or an ocular micrometer mounted in a stereomicroscope. Species abundance and density data for these collections may be found in the GCE-LTER data set INV-GCEM-0812a1. Numbers of individuals of each species in the abundance data file may not correspond exactly to the numbers of individuals in the size data file because some individuals may not have been measureable.

本数据集为2008年秋季的调查报告，聚焦于用于种群监测的GCE-LTER盐沼点位内的底内软体动物（infaunal mollusc）与底表软体动物（epifaunal mollusc）的种群大小分布情况。所有采样点位均在盐沼中部与溪岸带（每个区域布设4个已知面积的样方）中，以手工方式采集上述软体动物。所获样本被带回实验室后，经乙醇固定保存，随即开展体长测量与个体计数（个体计数数据将另行公布）。每只可测量个体的体长通过游标卡尺（calipers）或安装于体视显微镜（stereomicroscope）的目镜测微尺（ocular micrometer）完成测定。本次采集样本的物种种群丰度与密度数据可从GCE-LTER数据集INV-GCEM-0812a1中获取。丰度数据文件中各物种种群的个体总数，或与体长测量数据文件中的个体总数不完全一致，原因在于部分个体无法完成体长测量。