Abundance of mesozooplankton in the western part of the Black Sea in summer 2002 during the National Monitoring Programme

The dataset is based on samples collected in the summer of 2002 in the Western Black Sea in front of Bulgaria coast. The whole dataset is composed of 47 samples (from 19 stations of National Monitoring Grid) with data of mesozooplankton species composition abundance and biomass. Sampling for zooplankton was performed from bottom up to the surface at depths depending on water column stratification and the thermocline depth.
Zooplankton samples were collected with vertical closing Juday net,diameter - 36cm, mesh size 150 µm. Tows were performed from surface down to bottom meters depths in discrete layers. Samples were preserved by a 4% formaldehyde sea water buffered solution. Sampling volume was estimated by multiplying the mouth area with the wire length.
Mesozooplankton abundance: The collected material was analysed using the method of Domov (1959). Samples were brought to volume of 25-30 ml depending upon zooplankton density and mixed intensively until all organisms were distributed randomly in the sample volume. After that 5 ml of sample was taken and poured in the counting chamber which is a rectangle form for taxomomic identification and count. Large (> 1 mm body length) and not abundant species were calculated in whole sample. Counting and measuring of organisms were made in the Dimov chamber under the stereomicroscope to the lowest taxon possible. Taxonomic identification was done at the Institute of Oceanology by Lyudmila Kamburska using the relevant taxonomic literature (Mordukhay-Boltovskoy, F.D. (Ed.). 1968, 1969,1972).
Taxon-specific abundance: The collected material was analysed using the method of Domov (1959). Samples were brought to volume of 25-30 ml depending upon zooplankton density and mixed intensively until all organisms were distributed randomly in the sample volume. After that 5 ml of sample was taken and poured in the counting chamber which is a rectangle form for taxomomic identification and count. Copepods and Cladoceras were identified and enumerated; the other mesozooplankters were identified and enumerated at higher taxonomic level (commonly named as mesozooplankton groups). Large (> 1 mm body length) and not abundant species were calculated in whole sample. Counting and measuring of organisms were made in the Dimov chamber under the stereomicroscope to the lowest taxon possible. Taxonomic identification was done at the Institute of Oceanology by Lyudmila Kamburska using the relevant taxonomic literature (Mordukhay-Boltovskoy, F.D. (Ed.). 1968, 1969,1972).

本数据集基于2002年夏季在保加利亚沿岸外的西黑海海域采集的样品。全数据集包含47份样品（取自国家监测网格的19个站位），涵盖中型浮游动物（mesozooplankton）的物种组成、丰度与生物量数据。
浮游动物采样根据水柱分层与温跃层深度，采用从海底至表层的垂直分层方式进行。本次采样使用垂直封闭型Juday网（Juday net，直径36cm，网孔尺寸150μm），以离散分层模式开展拖网作业，拖网范围覆盖从表层至对应站位水底的各水层。样品采用4%甲醛海水缓冲溶液进行固定。采样体积通过网口面积与拖网缆绳长度的乘积计算得到。
中型浮游动物丰度：采集的样品采用Domov（1959）方法开展分析。根据浮游动物密度将样品定容至25~30mL，充分混匀直至所有生物在样液中均匀随机分布。随后取5mL样品注入矩形计数池，用于物种分类鉴定与个体计数。体型大于1mm且丰度较低的物种以全样进行计数。生物个体的计数与测量在实体显微镜下的Dimov计数池（Dimov chamber）中完成，尽可能将物种鉴定至最低分类阶元。分类鉴定工作由Lyudmila Kamburska在保加利亚海洋学研究所完成，参考了相关分类学专著（Mordukhay-Boltovskoy, F.D. (Ed.). 1968, 1969,1972）。
类群专属丰度：采集的样品同样采用Domov（1959）方法开展分析。根据浮游动物密度将样品定容至25~30mL，充分混匀直至所有生物在样液中均匀随机分布。随后取5mL样品注入矩形计数池，用于物种分类鉴定与个体计数。其中桡足类（Copepods）与枝角类（Cladoceras）需鉴定并计数至物种水平，其余中型浮游动物则鉴定并计数至更高分类阶元（通常归类为中型浮游动物类群）。体型大于1mm且丰度较低的物种以全样进行计数。生物个体的计数与测量在实体显微镜下的Dimov计数池（Dimov chamber）中完成，尽可能将物种鉴定至最低分类阶元。分类鉴定工作由Lyudmila Kamburska在保加利亚海洋学研究所完成，参考了相关分类学专著（Mordukhay-Boltovskoy, F.D. (Ed.). 1968, 1969,1972）。