Surface zooplankton size and taxonomic composition in Bowdoin Fjord, north-western Greenland: A comparison of ZooScan, OPC and microscopic analyses
Surface zooplankton size and taxonomic composition in Bowdoin Fjord, north-western Greenland: A comparison of ZooScan, OPC and microscopic analyses
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DOI：
10.1016/j.polar.2019.01.001
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发表时间：
2019-03
期刊：
影响因子：
1.8
通讯作者：
Akihiro Naito;Yoshiyuki Abe;K. Matsuno;B. Nishizawa;N. Kanna;S. Sugiyama;A. Yamaguchi
中科院分区：
文献类型：
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作者：
Akihiro Naito;Yoshiyuki Abe;K. Matsuno;B. Nishizawa;N. Kanna;S. Sugiyama;A. Yamaguchi
在格陵兰岛，冰川将浑浊的冰下淡水排入峡湾，在冰解前缘附近形成羽流。为了评估排放对峡湾浮游动物群落的影响，我们于2016年夏季在格陵兰西北部的鲍登峡湾收集了海面浮游动物样本，并进行了显微镜，OPC和ZooScan分析。在这三种定量方法中，ZooScan具有可以评估各种参数（例如，该系统能够同时收集生物量、生物量、大小和分类信息），并能够排除样品中含量丰富的淤泥和沉积物等非生物颗粒。根据生物量分类数据，浮游动物群落可分为三个类群，这些类群在空间上存在差异：内峡湾类群、中峡湾类群和外峡湾类群。外峡湾组以水母为主，中峡湾组以藤壶幼虫为主。对于内峡湾群，大型哲水蚤属（Calanusspp.）毛颚类动物也很丰富。由于这些物种的特点与海洋类群，他们将通过深峡湾水入侵，随后通过夹带冰川改性羽流水涌上。从浮游动物大小谱的NBSS分析，NBSS在峡湾中部的陡坡表明，高生产力是由merodentonic cypris幼虫的加入。
In Greenland, tidewater glaciers discharge turbid subglacial freshwater into fjords, forming plumes near the calving fronts. To evaluate the effects of this discharge on the zooplankton community in the fjords, we collected sea surface zooplankton samples in Bowdoin Fjord in north-western Greenland during the summer of 2016 and made microscopic, OPC and ZooScan analyses. Within the three quantitative methods, ZooScan has advantages that can evaluate various parameters (e.g., abundance, biomass, size and taxonomic information) simultaneously and has the ability to eliminate abiotic particles, such as silt and sediment, which are abundant in samples. Based on taxonomic biomass data, the zooplankton community is clustered into three groups, which varied spatially: inner, middle and outer fjord groups. Jellyfish dominated the outer fjord group, and barnacle cypris larvae dominated the middle fjord group. For the inner fjord group, large-sizedCalanusspp. and chaetognaths were abundant. Since these species are characterized with oceanic taxa, they would intrude through the deep fjord water and subsequently be upwelled through entrainment of glacially modified plume water. From the NBSS analysis on zooplankton size spectra, the steep slope of NBSS in the middle fjord community suggests that the high productivity was caused by the addition of meroplanktonic cypris larvae.