Variation of phytoplankton assemblages of Kongsfjorden in early autumn 2012: a microscopic and pigment ratio-based assessment

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• 作者：Jane T. Bhaskar ; S. C. Tripathy ; P. Sabu…
• 关键词：Phytoplankton abundance ; Species distribution ; Chlorophyll a ; Pigment ratio ; Spectrophotometric ; Kongsfjorden
• 刊名：Environmental Monitoring and Assessment
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：188
• 期：4
• 全文大小：2,217 KB
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• 作者单位：Jane T. Bhaskar (1)
  S. C. Tripathy (1)
  P. Sabu (1)
  C. M. Laluraj (1)
  S. Rajan (1)
  
  1. ESSO-National Centre for Antarctic and Ocean Research, Ministry of Earth Sciences, Govt. of India, Headland Sada, Vasco da Gama, Goa, 403 804, India
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  Ecology
  Atmospheric Protection, Air Quality Control and Air Pollution
  Environmental Management
  
• 出版者：Springer Netherlands
• ISSN：1573-2959

文摘

Phytoplankton species distribution and composition were determined by using microscopy and pigment ratios in the Kongsfjorden during early autumn 2012. Variation in sea surface temperature (SST) was minimal and matched well with satellite-derived SST. Nutrients were generally limited. Surface phytoplankton abundance ranged from 0.21 × 103 to 10.28 × 103 cells L−1. Phytoplankton abundance decreased with depth and did not show any significant correlation with chlorophyll a (chl a). Column-integrated phytoplankton cell counts (PCC) ranged from 94.3 × 106 cells m−2 (Kf4) to 13.7 × 106 cells m−2 (Kf5), while chl a was lowest at inner part of the fjord (6.3 mg m−2) and highest towards the mouth (24.83 mg m−2). Biomass from prymnesiophytes and raphidophytes dominated at surface and 10 m, respectively. The contribution of Bacillariophyceae to biomass was low. Generally, heterotrophic dinoflagellates were great in abundance (12.82 %) and ubiquitous in nature and were major contributors to biomass. Various chl pigments (chl b, chl c, phaeopigments (phaeo)) were measured to obtain pigment/chl a ratios to ascertain phytoplankton composition. Phaeo were observed only in inner fjord. Chl b:a ratios and microscopic observations indicated dominance of Chlorophyceae at greater depths than surface. Furthermore, microscopic observations confirmed dominance of chl c containing algae throughout the fjord. The study indicates that pigment ratios can be used as a tool for preliminary identification of major phytoplankton groups. However, under the presence of a large number of heterotrophic dinoflagellates such as Gymnodinium sp. and Gyrodinium sp., pigment signatures need to be supplemented by microscopic observations.