孟加拉国东南海岸浮游植物动态与基本海洋学变量的时空变化

IF 2.1 4区 地球科学 Q2 MARINE & FRESHWATER BIOLOGY
Subrata Sarker , Shashowti Chowdhury Riya , Md Jalilur Rahman , A.N.M. Samiul Huda , Md. Shahadat Hossain , Nabanita Das
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引用次数: 0

摘要

浮游植物是食物链的基础,在维持全球气候系统中起着关键作用。然而,对代表亚热带沿海生态系统的孟加拉国海岸浮游植物生态学的了解非常有限。因此,本研究旨在了解孟加拉东南沿海浮游植物群落的时空变化与环境变量的关系。从2022年1月至2022年12月,收集了基本海洋变量(即温度、盐度、溶解氧、浊度、硅酸盐、硝酸盐和磷酸盐)和浮游植物物种丰度的月度数据。研究发现,孟加拉国Naf -圣马丁半岛主要海洋变量和浮游植物群落组成具有较强的时空变异性。河口生态系统具有高营养盐、低盐度的特点,而近海生态系统具有相对低营养盐、高盐度的特点。通过常年取样,共鉴定出154种浮游植物。在河口生态系统中,主要贡献种为马里骨螯虾、中央盘尾虾、银盘尾虾和traducens盘尾虾,而在近海生态系统中主要贡献种为根状角螯虾、毛角角螯虾、梭形角螯虾、抽角角螯虾、墨勒角螯虾和纹状角螯虾。我们的研究发现,温度、盐度、浊度、硅酸盐、硝酸盐和磷酸盐6个解释变量共同解释了浮游植物群落动态变化的78%。硝酸盐浓度解释了最大的变异(19%),其次是磷酸盐(17%)、盐度(15%)、硅酸盐(12%)、浊度(10%)和表面温度(5%)。本研究对了解亚热带沿海生态系统浮游植物动态的时空变化具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spatial and temporal variability of phytoplankton dynamics in-relation to essential oceanographic variables in the south east coast of Bangladesh

Phytoplankton form the base of food chain and play a key role in maintaining the global climate system. However, very limited knowledge is available about the phytoplankton ecology of Bangladesh coast which is a representation of sub-tropical coastal ecosystem. Thus, this study aimed to understand the spatial and temporal variability of phytoplankton community in-relation to environmental variables in the South East coast of Bangladesh. Monthly data on essential oceanographic variables (i.e. temperature, salinity, dissolved oxygen, turbidity, silicate, nitrate and phosphate) and phytoplankton species abundance were collected from January 2022 to December 2022. We found a strong spatial and temporal variability in essential oceanographic variables and phytoplankton community compositions in Naf – Saint Martin Peninsula of Bangladesh. Estuarine ecosystem is characterized by high nutrients and low salinity while offshore ecosystem was found with comparatively low nutrients and high salinity. About 154 phytoplankton species were identified from the study area through year round sampling events. In the estuarine ecosystem Skeletonema marino, Coscinodiscus centralis, Coscinodiscus argus and Coscinodiscus traducens were found as the major contributing species at the estuarine ecosystem while Chaetoceros radican, Tripos trichoceros, Cylindrotheca Closterium, Chaetoceros convulutus, Tripos muelleri, and Cyclotella striata were found as the major contributing species at the offshore ecosystem. Our study found that 6 explanatory variables (i.e. temperature, salinity, turbidity, silicate, nitrate and phosphate) jointly explained about 78% variability in phytoplankton community dynamics. Nitrate concentration explained maximum variability (19%) followed by phosphate (17%), salinity (15%), silicate (12%), turbidity (10%) and surface temperature (5%). This study will play a key role in understanding the spatial and temporal variability of phytoplankton dynamics in the sub-tropical coastal ecosystem.

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来源期刊
Journal of Sea Research
Journal of Sea Research 地学-海洋学
CiteScore
3.20
自引率
5.00%
发文量
86
审稿时长
6-12 weeks
期刊介绍: The Journal of Sea Research is an international and multidisciplinary periodical on marine research, with an emphasis on the functioning of marine ecosystems in coastal and shelf seas, including intertidal, estuarine and brackish environments. As several subdisciplines add to this aim, manuscripts are welcome from the fields of marine biology, marine chemistry, marine sedimentology and physical oceanography, provided they add to the understanding of ecosystem processes.
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