Mesozooplankton average mass during Akademik Kovalevsky cruise AK7/2, Part I

Mesozooplankton was sampled by open-closing JUDAY net with a 36 cm ring diameter and mesh size of 0.145 mm. The open-closing mechanism used was the Nansen mechanical lock system allowing nets to be vertically towed through standard depths (0-10, 10-25, 25-50, 50-100, 100-200, 200-500 m) and closed at the upper depth level. 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 cm、网目尺寸0.145 mm的开闭式JUDAY网（JUDAY net）采集中型浮游动物（Mesozooplankton）。该网具搭载的开闭机构为南森机械锁定系统（Nansen mechanical lock system），可实现网具在预设标准水层（0~10 m、10~25 m、25~50 m、50~100 m、100~200 m、200~500 m）内的垂直拖网，并在上层水层边界处闭合。拖网水深通过放出的钢缆长度及钢缆倾斜角进行测算。采集得到的10~20 mL样品经3%~4%缓冲甲醛溶液固定后，带回实验室进行处理。所有桡足类（Copepods）均鉴定至属级分类阶元，其余分类类群则分别鉴定至型、纲、目及科级分类阶元。