Srichandan Suchismita, Kim Ji Yoon, Bhadury Punyasloke, Barik Saroja K, Muduli Pradipta R, Samal Rabindro N, Pattnaik Ajit K, Rastogi Gurdeep
Wetland Research and Training Centre, Chilika Development Authority, Barkul, Balugaon, Odisha, 752030, India.
Environ Monit Assess. 2015 Feb;187(2):47. doi: 10.1007/s10661-014-4212-9. Epub 2015 Feb 1.
The Asia's largest lagoon, Chilika, is a shallow water estuary and a designated "Ramsar" site located in the east coast of India. The spatiotemporal diversity of phytoplankton based on the monthly sampling between July 2011 and June 2012 was investigated in relation to physicochemical variables of the surface water column from 13 stations. The salinity was minimum (average 9) during the monsoon which was primarily due to riverine discharge. As the season progressed towards post-monsoon, average salinity of the whole lagoon reached to 10 which further increased to 20 during pre-monsoon season. A total of 259 species of phytoplankton, mostly dominated by the Bacillariophyta (138 species) followed by Dinophyta (38 species), Chlorophyta (32 species), Cyanophyta (29 species), Euglenophyta (18 species), and Chrysophyta (4 species), were recorded in this study. Different ecological sectors of the lagoon (except the northern sector) were dominated by diatoms, while the northern sector due to its freshwater regime supported large population of euglenoids. Based on the multivariate ordination analysis, salinity regime and light availability played important role in determining the distribution, diversity, and composition of phytoplankton communities. Overall, this study documented a very high diversity of phytoplankton and highlighted the importance of taking extensive sampling in getting a clearer understanding of phytoplankton community structure in less-studied environments such as Chilika lagoon.
亚洲最大的泻湖奇利卡湖是一个浅水河口，也是位于印度东海岸的指定“拉姆萨尔”湿地。基于2011年7月至2012年6月期间的月度采样，研究了13个站点浮游植物的时空多样性与表层水柱理化变量的关系。季风期间盐度最低（平均9），这主要是由于河流径流。随着季节向后季风期推进，整个泻湖的平均盐度达到10，在前季风期进一步升至20。本研究共记录了259种浮游植物，其中大多数为硅藻门（138种），其次是甲藻门（38种）、绿藻门（32种）、蓝藻门（29种）、裸藻门（18种）和金藻门（4种）。泻湖的不同生态区域（北部区域除外）以硅藻为主，而北部区域由于其淡水环境，支持大量裸藻类生物。基于多变量排序分析，盐度状况和光照可用性在决定浮游植物群落的分布、多样性和组成方面发挥了重要作用。总体而言，本研究记录了浮游植物的高度多样性，并强调了在像奇利卡湖这样研究较少的环境中进行广泛采样对于更清楚地了解浮游植物群落结构的重要性。
