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Observations of surface water phytoplankton community in the Indian Ocean: A transect from tropics to polar latitudes
Deep Sea Research Part II: Topical Studies in Oceanography ( IF 3 ) Pub Date : 2020-08-17 , DOI: 10.1016/j.dsr2.2020.104848
Ravidas Krishna Naik , Jenson George , Melena Soares , N. Anilkumar , R.K. Mishra , Rajdeep Roy , P.V. Bhaskar , Sanitha Sivadas , Nuncio Murukesh , Racheal Chacko , C.T. Achuthankutty

Phytoplankton, the primary producers in all aquatic systems, plays an important role in key biogeochemical processes that are linked to higher trophic levels and climate variability. The present study deals with the phytoplankton community structure in the Indian Ocean, particularly in the higher latitudes with respect to environmental variables to understand the region specific dominant community and its governing environmental settings. The study areas were selected along the latitudinal transect between 3oN and 53oS (northern Indian Ocean to Indian Ocean sector of Southern Ocean). The surface water phytoplankton community based on microscopy coupled with diagnostic pigment indices showed marked variation in community structure from tropical to polar latitudes of the Indian Ocean. The Prokaryotic diagnostic pigment (ProkDP) dominated in the Equatorial and South Equatorial regions, the Flagellate diagnostic pigment (FlagDP) in the North Equatorial region (NER), Southern Tropical Indian Ocean and Sub-tropical Front (STF) region whereas, the Diatom diagnostic pigment (DiatDP) dominated only at the Polar Front (PF) region. The influence of a suite of environmental variables - temperature, nutrients, salinity and mixed layer depth (MLD), on the dominant phytoplankton groups at the STF and PF was observed. This understanding of community dominance from this poorly explored area with respect to influencing factors is very vital baseline information to design the perturbation experiments in future work to understand the phytoplankton process studies of each region.



中文翻译:

印度洋地表水浮游植物群落的观测:从热带到极地的一个样带

浮游植物是所有水生系统的主要生产者,在与较高营养水平和气候多变性有关的关键生物地球化学过程中发挥着重要作用。本研究涉及印度洋的浮游植物群落结构,特别是在高纬度地区的环境变量方面,以了解该地区特定的优势群落及其治理环境。物3之间沿横向断面中选择的研究领域ø N和53 öS(印度洋北部至南部海洋的印度洋部分)。基于显微镜的地表水浮游植物群落和诊断性色素指数显示,从热带到印度洋的极地纬度,群落结构发生了明显变化。原核诊断色素(proK启动DP在赤道与南赤道地区为主),在鞭毛诊断色素(旗DP)在北赤道区域(NER),南方热带印度洋和亚热带阵线(STF)区域,而中,硅藻诊断颜料(Diat DP)仅在极地(PF)区域占主导地位。观察到一系列环境变量-温度,养分,盐度和混合层深度(MLD)对STF和PF的主要浮游植物群的影响。从这个开发不佳的地区对影响因素对社区优势的这种了解,对于在将来的工作中设计扰动实验以了解每个地区的浮游植物过程研究而言,是至关重要的基线信息。

更新日期:2020-09-20
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