Chiranjeevulu Gundala, Murty K Narasimha, Sarma Nittala S, Kiran Rayaprolu, Chari N V H K, Pandi Sudarsana Rao, Venkatesh Pragada, Annapurna C, Nageswara Rao K
Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, India.
Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, India.
Mar Environ Res. 2014 Jul;98:49-59. doi: 10.1016/j.marenvres.2014.03.002. Epub 2014 Mar 15.
Chromophoric dissolved organic matter (CDOM) and hydrochemical parameters were measured in the nearshore region of the western Bay of Bengal with and without significant terrestrial influence. A meso-scale cyclonic eddy that occupied the northern part of the study area set up a nutrient enriched distinct ecosystem in April (premonsoon) attended with increased levels of DOM fluorescence, particularly the protein tyrosine like fluorescence (B). A new (minor) fluorescence component, attributed to land source was revealed which contained two fluorophores, the red-shifted tryptophan-like (TU) hypothesized as the "unfolded protein" and the petroleum hydrocarbon-like (P). During the eddy, pennate diatom population increased, bringing the centric:pennate diatom ratio to half of what it was during the remaining period (monsoon season). The nutrients distribution suggested that when pennates are favored (premonsoon), orthophosphate and silicate are the limiting nutrients and that when centric diatoms are favored (monsoon season), the limitation is by nitrate.
在受陆地影响显著和不显著的情况下，对孟加拉湾西部近岸区域的发色溶解有机物（CDOM）和水化学参数进行了测量。一个占据研究区域北部的中尺度气旋涡旋在4月（季风前）建立了一个营养丰富的独特生态系统，同时伴随着溶解有机物荧光水平的增加，特别是蛋白质酪氨酸样荧光（B）。揭示了一种新的（次要的）归因于陆地来源的荧光成分，它包含两种荧光团，红移的色氨酸样（TU）被假设为“未折叠蛋白”，以及石油烃样（P）。在涡旋期间，羽纹硅藻种群增加，使中心硅藻与羽纹硅藻的比例降至其余时期（季风季节）的一半。营养物质分布表明，当羽纹硅藻占优势时（季风前），正磷酸盐和硅酸盐是限制营养物质，而当中心硅藻占优势时（季风季节），限制因素是硝酸盐。
