Indian National Centre for Ocean Information Services (INCOIS), Hyderabad 500090, India.
Indian National Centre for Ocean Information Services (INCOIS), Hyderabad 500090, India.
Mar Pollut Bull. 2018 Apr;129(1):222-230. doi: 10.1016/j.marpolbul.2018.02.031. Epub 2018 Feb 25.
A comprehensive analysis on the phytoplankton ecology with special reference to different phytoplankton size classes was carried out at green Noctiluca scintillans (hereafter Noctiluca) bloom and non-bloom locations in offshore waters of the northern Arabian Sea. At the bloom locations, green Noctiluca represented a dense mono-specific proliferation with average cell density of 10.16 ± 5.806 × 10 cells-L and relative abundance share of 98.63%. Active photosynthesis through prasinophytic endosymbiont was depicted from net community production magnitude reaching 85.26 mgC/m/Day under low prey abundance. Parallel swarming of Porpita porpita, a voracious copepod feeder signified the competitive advantage of Noctiluca to have the phytoplankton prey. Average concentration of picophytoplankton biomass was eleven times lower in surface waters of non-bloom stations in comparison to bloom. Higher N:P ratio in subsurface waters of non-bloom stations signified non-utilization of nitrogenous nutrients. Green Noctiluca bloom onset subsequent to diatom rich conditions was evident from spatio-temporal ocean colour satellite imageries.
对阿拉伯海北部近海绿夜光藻（以下简称夜光藻）爆发和非爆发区的浮游植物生态学进行了全面分析，特别关注不同浮游植物大小类群。在爆发区，绿夜光藻呈密集的单一种群增殖，平均细胞密度为 10.16 ± 5.806 × 10 个细胞/L，相对丰度份额为 98.63%。通过网群落生产力达到 85.26 mgC/m/Day 的低值，表明存在通过甲藻内共生体进行的活跃光合作用。在低猎物丰度下，贪婪的桡足类食者波皮塔波皮塔（Porpita porpita）的平行群集表明夜光藻具有竞争优势来捕食浮游植物。与爆发区相比，非爆发区的表水中小浮游植物生物量的平均浓度低 11 倍。非爆发区次表层水中的高 N:P 比表明氮营养物质未被利用。从时空海洋色卫星图像可以明显看出，夜光藻爆发是在硅藻丰富的条件之后发生的。
