Mesozooplankton abundance and species composition in the Gulf of Naples and the Gulf of Salerno in March 1987. Part 2

Mouth diameter of the net was 113 cm, mesh size 200 µm. Samples were immediately fixed with formaldehyde (2-4% final concentration) for specimen identification and counts. Volumes of filtered seawater were estimated by multiplying the area of the net mouth by heights of sampled layers from winch readings. Identification and counts of specimens were performed on 1/4 of fixed samples by using the Huntsman beaker subsampling technique (Van Guelpen et al., 1982). Copepods were identified to the species level and separated into females, males and juveniles (copepodites). All other taxa were identified at the species level when possible, or at higher taxonomic levels. Taxonomic identification was done according to the most relevant and updated taxonomic literature.

网口直径为113 cm，网孔孔径为200 µm。样品即刻以甲醛（终浓度2%~4%）固定，用于标本鉴定与计数。过滤海水体积通过网口面积乘以由绞车读数获取的采样层高度进行估算。采用亨茨曼烧杯分样法（Van Guelpen et al., 1982）对1/4的固定样品开展标本鉴定与计数工作。桡足类（Copepods）鉴定至物种水平，并划分为雌性、雄性与幼体（桡足幼体）。其余所有类群尽可能鉴定至物种水平，无法达到物种水平时则鉴定至更高分类阶元。分类学鉴定依据最具相关性且最新的分类学文献完成。