Mollusc population size distribution monitoring: Fall 2009 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 2009 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-1010a1. 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2009年秋季的调查报告，聚焦用于种群监测的GCE-LTER盐沼站点内底内（infaunal）与底上（epifaunal）软体动物物种的体型分布特征。研究人员在所有站点的盐沼中部与潮溪岸带区域，从已知面积的样方（quadrat）内手工采集上述软体动物，每个区域设置4个样方（n=4）。采集所得的软体动物被带回实验室，以乙醇固定保存，随后进行体长测量与个体计数（个体计数数据将单独报告）。对每只可测量个体的体长，采用游标卡尺（calipers）或安装于体视显微镜（stereomicroscope）上的目镜测微尺（ocular micrometer）完成测定。本次采集对应的物种丰度与密度数据，可在GCE-LTER数据集INV-GCEM-1010a1中获取。丰度数据文件中各物种的个体数量，可能与体型数据文件中的个体数量不完全一致，原因是部分个体无法进行体长测量。