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Inter-annual and seasonal variations in hydrological parameters and its implications on chlorophyll a distribution along the southwest coast of Bay of Bengal

查看全文 作　　者：Shanthi [1]R.;Poornima [1]D.;Raja [1]K.;Sarangi [2]R.K.;Saravanakumar [1]A.;Thangaradjou [1]T. 高影响力作者 机构地区：[1]Centre of Advanced Study in Marine Biology, Faculty of Marine Sciences, Annamalai University;[2]Marine, Geo and Planetary Sciences Group, Space Application Centre (ISRO)高影响力机构 出　　处：《Acta Oceanologica Sinica》索引2015年第34卷第6期,共7页高影响力期刊 基　　金：the course of study/project as part of the Meteorology and Oceanography (MOP-2) Program of ISRO 摘　　要：Seasonal and inter-annual variability of hydrological parameters and its impact on chlorophyll distribution was studied from January 2009 to December 2011 at four coastal stations along the southwest Bay of Bengal. Statistical analysis(principal component analysis(PCA), two-way analysis of variance(ANOVA) and correlation analysis)showed the significant impact of hydrological parameters on chlorophyll distribution in the study area. The ranges of different parameters recorded were 23.8–33.8°C(SST), 4.00–36.00(salinity), 7.0–9.2(p H), 4.41–8.32 mg/L(dissolved oxygen), 0.04–2.45 μmol/L(nitrite), 0.33–16.10 μmol/L(nitrate), 0.02–2.51 μmol/L(ammonia),0.04–3.32 μmol/L(inorganic phosphate), 10.09–85.28 μmol/L(reactive silicate) and 0.04–13.8 μg/L(chlorophyll).PCA analysis carried out for different seasons found variations in the relationship between physico-chemical parameters and chlorophyll in which nitrate and chlorophyll were positively loaded at PC1(principal component1) during spring inter-monsoon and at PC2(principal component 2) during other seasons. Likewise correlation analysis also showed significant positive relationship between chlorophyll and nutrients especially with nitrate(r=0.734). Distribution of hydrobiological parameters between stations and distances was significantly varying as evidenced from the ANOVA results. The study found that the spatial and temporal distribution of chlorophyll was highly dependent on the availability of nutrients especially, nitrate in the southwest Bay of Bengal coastal waters. 关 键 词：叶绿素含量 季节变化 水文参数 年际变化 主成分分析法 相关分析法 方差分析法 亚硝酸盐
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