Zooplankton abundance in the Kerguelen Axis region

Zooplankton were collected with a Rectangular Midwater Trawl (RMT 8+1 net) from 37 sampling sites on and near the Southern Kerguelen Plateau. The contents of each net were preserved in 5% buffered formaldehyde. This dataset covers the counts of the contents of the RMT1 net. The contents were split in the laboratory using a Motoda Box and then identified and counted under a Leica M165C stereo-microscope. A flow meter attached to the mouth of the RMT 8 was used to record the volume of seawater passing through the net, and this volume was converted to water passing through the RMT 1 by applying the conversion factor of 2.027357. The organisms in the samples were identified to the lowest taxonomic level possible. For copepods and euphausiids this level was to species, and generally to sex and/or development stage. For other groups, the identifications were to high levels such as Family or Order.

本数据集的浮游动物样本采自凯尔盖朗高原南部及周边37个采样点位，采集工具为矩形中层拖网（Rectangular Midwater Trawl，RMT 8+1网）。每份拖网获取的样本均采用5%缓冲甲醛溶液进行固定保存。本数据集包含RMT1网采集样本的个体计数数据。实验室阶段，研究人员先使用莫托达分样器（Motoda Box）对样本进行分样，随后借助徕卡M165C立体显微镜（Leica M165C stereo-microscope）完成物种鉴定与个体计数。研究人员在RMT 8网的网口安装流量计，以记录流经该网的海水体积；随后通过转换系数2.027357，将该体积换算为流经RMT1网的海水体积。样本中的所有生物均被鉴定至尽可能低的分类阶元：其中桡足类（copepods）与磷虾类（euphausiids）可鉴定至物种水平，且通常可进一步区分性别与/或发育阶段；其余类群则仅能鉴定至科（Family）或目（Order）等较高分类阶元。