Mesozooplankton adundance during Professor Vodyanitskiy cruise PV18, Part II

Mesozooplankton was sampled by open-closing JUDAY net with a 36 cm ring diameter and mesh size of 125 µm. The open-closing mechanism used was the Nansen mechanical lock system allowing nets to be vertically towed through depths with the temperature gradient maximum (from 10-40 down to 50-100 m) and closed at the upper depth level. Integrated hauls (0-100 m) were also taken. Depth of tow was evaluated by wire paid out and the angle of wire inclination. The 10-20 ml samples were preserved in 3-4% buffered formaldehyde and processed on return to the laboratory. All of copepods were identified to genus level, other taxanomic groups - to type, class, order and family levels.

本研究采用环径36厘米、网目尺寸125微米的开闭式JUDAY网（open-closing JUDAY net）采集中型浮游动物（Mesozooplankton）。该网具搭载南森机械锁定系统（Nansen mechanical lock system），可使网具在温度梯度最大值水层（深度区间为10-40米至50-100米）内垂直拖曳，并在上层水深位置完成闭合。此外同步开展了全水层（0-100米）整合拖网采样。拖网深度通过放出缆绳的长度及缆绳倾斜角进行测算。采集得到的10至20毫升样品经3%-4%的缓冲甲醛溶液固定，返回实验室后开展后续处理工作。所有桡足类（copepods）均鉴定至属级水平，其余分类类群则鉴定至型、纲、目及科级水平。