Mollusc population size distribution monitoring: Fall 2003 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 2003 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, fixed in fomalin, transferred to and preserved in ethanol, measured and counted (count data is reported separately). Length of each measurable individual was determined using calipers or small etched rulers under a stereomicroscope. Species abundance and density data for these collections may be found in the GCE-LTER data set INV-GCEM-0502a1. 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2003年秋季的调查数据集，涵盖用于种群监测的GCE-LTER沼泽站点内的底内软体动物（infaunal mollusc）与底上软体动物（epifaunal mollusc）的各物种种群尺寸分布数据。研究人员在所有站点的沼泽中部与河岸带区域，于已知面积的样方（quadrat）内手动采集软体动物，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，先用福尔马林（formalin）固定，随后转移至乙醇（ethanol）中保存，之后对其进行体长测量与个体计数（个体计数数据将单独发布）。每个可测量个体的体长均通过体视显微镜（stereomicroscope）下的游标卡尺（calipers）或小型刻蚀标尺完成测定。本次采集的物种种群丰度与密度数据可从GCE-LTER数据集INV-GCEM-0502a1中获取。丰度数据文件中各物种种群的个体数量，与尺寸数据文件中的个体数量可能不完全一致，原因是部分个体无法完成体长测量。