Biswas Sejuti Naha, Rakshit Dibyendu, Sarkar Santosh Kumar, Sarangi Ranjit Kumar, Satpathy Kamala Kanta
Department of Marine Science, University of Calcutta, Calcutta, India.
Department of Marine Science, University of Calcutta, Calcutta, India.
Mar Pollut Bull. 2014 Aug 15;85(1):306-11. doi: 10.1016/j.marpolbul.2014.04.015. Epub 2014 Jun 24.
A multispecies bloom caused by the centric diatoms, viz. Coscinodiscus radiatus, Chaetoceros lorenzianus and the pennate diatom Thalassiothrix frauenfeldii was investigated in the context of its impact on phytoplankton and microzooplankton (the loricate ciliate tintinnids) in the coastal regions of Sagar Island, the western part of Sundarban mangrove wetland, India. Both number (15-18 species) and cell densities (12.3 × 10(3)cellsl(-1) to 11.4 × 10(5)cellsl(-1)) of phytoplankton species increased during peak bloom phase, exhibiting moderately high species diversity (H'=2.86), richness (R'=6.38) and evenness (E'=0.80). The diatom bloom, which existed for a week, had a negative impact on the tintinnid community in terms of drastic changes in species diversity index (1.09-0.004) and population density (582.5 × 10(3) to 50 × 10(3)indm(-3)). The bloom is suggested to have been driven by the aquaculture activities and river effluents resulting high nutrient concentrations in this region. An attempt has been made to correlate the satellite remote sensing-derived information to the bloom conditions. MODIS-Aqua derived chlorophyll maps have been interpreted.
在印度孙德尔本斯红树林湿地西部的萨加尔岛沿海地区，对由中心硅藻（辐射圆筛藻、洛氏角毛藻）和羽纹硅藻（弗氏海线藻）引发的多物种水华进行了调查，研究其对浮游植物和微型浮游动物（具铠纤毛虫类）的影响。在水华高峰期，浮游植物的种类数量（15 - 18种）和细胞密度（12.3×10³个细胞/升至11.4×10⁵个细胞/升）均有所增加，呈现出中等偏高的物种多样性（H' = 2.86）、丰富度（R' = 6.38）和均匀度（E' = 0.80）。持续一周的硅藻水华对具铠纤毛虫群落产生了负面影响，物种多样性指数（从1.09降至0.004）和种群密度（从582.5×10³个/立方米降至50×10³个/立方米）都发生了急剧变化。据推测，该地区的水产养殖活动和河流排放导致高营养浓度，从而引发了此次水华。研究人员尝试将卫星遥感获取的信息与水华情况相关联，并对中分辨率成像光谱仪（MODIS - Aqua）获取的叶绿素地图进行了解读。
