Mesozooplankton biomass under the Amazon River Plume influence measured during cruise Camadas Finas III

Zooplankton samples were collected in October 2012 aboard the Camadas Finas III cruise, using bongo nets with a 300 µm mesh size. The cruise followed the distribution of the Amazon River Plume across coastal and oceanic waters during the retroflection period of the North Brazil Current. For each sample, size fractions (>1 mm and <1 mm) were digitized using a ZooScan device (resolution: 2400 dpi) and analyzed using ZooProcess software. Images were counted, measurements were estimated, and data were organized into size bins. All living particles were subjected to quality control protocols established by The Pelagic Size Structure Database (PSSdb; https://pssdb.net/). A lower threshold of 600 µm was defined, while the upper threshold was determined by the largest size class prior to three consecutive empty size classes. Particles within these thresholds were used to estimate abundance, biovolume, biomass, and Normalized Biovolume Size Spectra (NBSS). For different taxonomic units, these data are summarized in the respective columns.

本数据集的浮游动物样本于2012年10月搭乘"Camadas Finas III"号科考航次采集，采样使用孔径为300 µm的邦戈网（bongo net）。本次航次覆盖了北巴西海流回流期内，亚马逊河羽流在近岸与远洋水域的分布区域。针对每份样本，研究人员通过ZooScan成像仪（ZooScan，分辨率：2400 dpi）完成大于1 mm与小于1 mm两个粒径分级的数字化扫描，并借助ZooProcess软件开展分析。对成像得到的颗粒进行计数、参数估算，并将数据按粒径区间整理归类。所有活体颗粒均按照远洋粒径结构数据库（Pelagic Size Structure Database, PSSdb；https://pssdb.net/）制定的质量控制规程进行质控。本次数据集设定600 µm为粒径下限，上限则以连续三个空粒径区间之前的最大粒径等级确定。以此粒径区间内的颗粒为基础，估算得到丰度、生物体积、生物量以及归一化生物体积粒径谱（Normalized Biovolume Size Spectra, NBSS）。针对不同分类单元，相关数据已汇总至对应列中。