Abundance and biomass of Calanoides natalis in the Benguela Current System during cruises AFR258 (2009) and D356 (2010)@en

Abundance and biomass data of the copepod Calanoides natalis were derived from vertical Multinet hauls with a mesh size of 200-300 µm. C. natalis was sampled in December 2009 (FRS Africana, AFR258) and September/October 2010 (RRS Discovery, D356) in the northern Benguela Current System from 17°S to 23°S. Several transects from neritic to offshore (up to 200 km from coast) stations were analysed. Maximum sampling depth was either close to the seafloor (neritic and shelf break stations) or 1000 m for the oceanic stations. In case of the FRS Africana 258 cruise maximum sampling depth was 700 m. Species and stages were identified and enumerated separately. Adult females, males and copepodite stage 5 (C5) and 4 (C4) were included in the abundance/biomass calculations. Abundance is expressed as number of individuals per m**3 and per m**2 and biomass as mg dry mass (DM) per m**2.本数据集包含的纳塔尔哲水蚤（Calanoides natalis）丰度与生物量数据，源自网目尺寸为200~300 μm的垂直多网拖网（Multinet hauls）作业。研究团队于2009年12月（搭载非洲号渔业研究船（FRS Africana），航次编号AFR258）与2010年9-10月（搭载发现号皇家研究船（RRS Discovery），航次编号D356），在南纬17°至23°的北本格拉流系（northern Benguela Current System）海域采集了该桡足类样本。本研究分析了覆盖近岸至远洋（距海岸最远200 km）站位的多条断面采样数据。采样最大深度依站位类型有所差异：近岸及陆架坡折站位的采样深度接近海底，远洋站位则为1000 m；其中非洲号航次AFR258的最大采样深度为700 m。研究人员对样本的物种及发育阶段分别进行了鉴定与计数。丰度与生物量计算仅纳入成年雌性、成年雄性及第4、第5期桡足幼体（C4、C5）。丰度以每立方米及每平方米个体数为单位表征，生物量以每平方米毫克干重（DM）为单位表征。