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Net-zooplankton abundance and biomass from Annaba Bay (SW Mediterranean Sea) under estuarine influences

机译:河口影响下安纳巴湾(西南地中海)的净浮游动物的丰度和生物量

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Normal 0 false false false EL X-NONE X-NONE Zooplankton samples were collected in Annaba Bay (Algeria) from January 2009-March 2011 at three coastal sites differently affected by estuarine plumes and external currents. Aim of this survey was to analyze zooplankton composition, abundance and biomass and compare the results with previous studies to reveal possible populations and environmental changes. The mean zooplankton abundance varied between 1,200-6,000 ind. m -3 and biomass 6.70-25.70 mg DW m -3 , according to the site. Copepods constituted the main fraction of zooplankton community, and Oithona similis and Paracalanus indicus successively dominated during autumn-winter and spring-summer. The dinoflagellate N octiluca scintillans was one of the major zooplankton components, and developed high numbers during February-April, becoming common in neritic and coastal regions. The singularity of the zooplankton from Annaba Bay is the prevalence of P. indicus throughout the entire bay and the decrease in Acartia discaudata and A. clausi (with respect to previous years), possibly replaced by A. negligens . Additionally, Oithona nana abundance markedly decreased with the large development of O. similis . Annaba Bay also differs from other similar Mediterranean coastal areas by the large development of Centropages ponticus populations during the warm period. Among the identified copepod species, the alien species Pseudodiaptomus australiensis and P. arabicus are reported for the first time in the Mediterranean Sea. The occurrence of copepodid V stages of P. australiensis suggests that this species survives and reproduces in Annaba Bay, but so far without developing an abundant population.
机译:正常0错误错误错误EL X-NONE X-NONE浮游动物样本于2009年1月至2011年3月在三个受河口羽流和外流影响不同的沿海地点采集(阿尔及利亚)安纳巴湾。这项调查的目的是分析浮游动物的组成,丰度和生物量,并将结果与​​以前的研究进行比较,以揭示可能的种群和环境变化。浮游动物的平均丰度在1,200-6,000 ind之间变化。 m -3和生物量6.70-25.70 mg DW m -3,根据现场。 pe足类动物是浮游动物群落的主要组成部分,秋冬季和春夏季期间,Oithona similis和Paracalanus indicus一直占主导地位。鞭毛藻鞭毛藻是主要的浮游动物组成部分之一,在2月至4月期间数量大量增加,在轻浮和沿海地区很常见。来自安纳巴湾的浮游动物的奇异性是整个海湾中印度印度鞭毛虫的盛行,以及disc螨和au螨的减少(相对于往年而言),有可能被黑线虫所替代。另外,随着O. similis的大量发育,Oithona nana的丰度显着降低。在温暖时期,安纳巴湾与其他类似的地中海沿岸地区的不同之处在于,Pentropages ponticus种群的大量发展。在已鉴定的co足类物种中,外来物种Pseudodiaptomus australiensis和P. arabicus首次在地中海报道。澳洲假单胞菌的近足V阶段的出现表明该物种在安纳巴湾生存和繁殖,但到目前为止还没有形成丰富的种群。

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