Mesozooplankton adundance during Akademik Vernadsky cruise AV3, Part IV

Mesozooplankton was sampled by open-closing JUDAY net with a 36 cm ring diameter and mesh size of 0.125 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, 200-300, 300-500, 500-1000 m) and closed at the upper depth level. Integrated hauls (0-100, 0-200 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.本研究采用网圈直径36 cm、网目尺寸0.125 mm的开闭式JUDAY网（JUDAY net）采集中型浮游动物（Mesozooplankton）样本。该网具搭载南森机械锁闭系统（Nansen mechanical lock system），可在预设标准水层（0~10 m、10~25 m、25~50 m、50~100 m、100~200 m、200~300 m、300~500 m、500~1000 m）中实施垂直拖网，并在上层水层边界处闭合网口。此外，还同步开展了0~100 m、0~200 m的整层连续拖网采样。拖网深度通过放出的缆绳长度及缆绳倾斜角度进行测算。采集得到的10~20 mL样本经3%~4%缓冲甲醛溶液固定后，在返回实验室后开展后续处理工作。所有桡足类（copepods）样本均被鉴定至属级分类阶元，其余浮游动物分类类群则分别鉴定至型、纲、目及科级分类阶元。