Begum Mehmuna, Sahu Biraja Kumar, Das Apurba Kumar, Vinithkumar Nambali Valsalan, Kirubagaran Ramalingam
Andaman and Nicobar Centre for Ocean Science and Technology, National Institute of Ocean Technology, Port Blair, 744103, India,
Environ Monit Assess. 2015 May;187(5):226. doi: 10.1007/s10661-015-4461-2. Epub 2015 Apr 3.
Blooming of diatom species Chaetoceros curvisetus (Cleve, 1889) was observed in Junglighat Bay and Haddo Harbour of Port Blair Bay of Andaman and Nicobar Islands during June 2010. Physico-chemical parameters, nutrient concentrations and phytoplankton composition data collected from five stations during 2010 were classified as bloom area (BA) and non-bloom area (NBA) and compared. Elevated values of dissolved oxygen were recorded in the BA, and it significantly varied (p < 0.01) from NBA. Among the nutrient parameters studied, nitrate concentration indicated significant variation in BA and NBA (p < 0.01). Phosphate and ammonia concentrations reduced to below detection level (BDL) in the BA and NBA, indicating its utilization. In Junglighat Bay, the C. curvisetus species constituted 93.4 and 69.2% composition of total phytoplankton population during day 1 and day 2, respectively. The bloom forming stations separated out from the non-bloom forming station in non-parametric multidimensional scaling (nMDS) ordinations; cluster analysis powered by SIMPROF test also grouped the stations as BA and NBA.
2010年6月，在安达曼和尼科巴群岛布莱尔湾的Junglighat湾和哈多港观测到了硅藻物种弯曲角毛藻（Cleve，1889）的大量繁殖。对2010年从五个站点收集的物理化学参数、营养物浓度和浮游植物组成数据进行分类，分为繁殖区（BA）和非繁殖区（NBA）并进行比较。繁殖区记录到溶解氧值升高，且与非繁殖区有显著差异（p < 0.01）。在所研究的营养物参数中，硝酸盐浓度在繁殖区和非繁殖区有显著差异（p < 0.01）。磷酸盐和氨浓度在繁殖区和非繁殖区降至检测水平以下（BDL），表明其被利用。在Junglighat湾，弯曲角毛藻物种在第1天和第2天分别占浮游植物总数的93.4%和69.2%。在非参数多维尺度分析（nMDS）排序中，形成繁殖的站点与未形成繁殖的站点分离；由SIMPROF检验支持的聚类分析也将站点分为繁殖区和非繁殖区。
