Abundance of mesozooplankton collected in October and November 1991 at 20 stations in the South Aegean Sea during O91

The O91- Mesozooplankton dataset is based on samples collected in mid October-mid November 1991 at 20 stations in the South Aegean, the SE.Ionian Sea and in NW Levantine. Samples were collected at discrete layers (from the surface till 300m. These data are published. Sampling volume was estimated by multiplying the mouth area with the wire length. The entire sample (for deep layers) or aliquot of Taxon-specific mesozooplankton abundance (1/4) (for the upper layer) was analyzed under the binocular microscope. Copepod and cladoceran species were identified and enumerated; the other zooplankters were identified and enumerated at higher taxonomic level (commonly named as zooplankton groups). Taxonomic identification was done by I.Siokou-Frangou, E.Christou, and N.Fragopoulu, using the relevant taxonomic literature. The entire sample (for deep layers) or aliquot of Mesozooplankton total abundance (1/4) (for the upper layer) was analyzed under the binocular microscope. All zooplankters were enumerated.

O91-中型浮游动物（Mesozooplankton）数据集基于1991年10月中旬至11月中旬，在南爱琴海、爱奥尼亚海东南部以及黎凡特海西北部的20个站位采集的样本构建。样本采集自离散水层（表层至300米水深范围），该数据集已公开发表。采样体积通过网口面积与网长的乘积进行估算。对于深层水层样本，采用全样进行分析；表层水层样本则取类群特异性中型浮游动物丰度1/4的子样，在双目显微镜下完成分析。其中，桡足类（Copepod）与枝角类（Cladoceran）物种需完成物种水平的鉴定与计数，其余浮游动物则在较高分类阶元（通常称为浮游动物类群）水平上开展鉴定与计数。分类鉴定工作由I.Siokou-Frangou、E.Christou及N.Fragopoulu完成，研究人员参考了相关分类学文献。对于深层水层样本，仍采用全样进行分析；表层水层样本则取总中型浮游动物丰度1/4的子样，在双目显微镜下完成分析，所有浮游动物均完成计数。