Characterization of phytoplankton size-structure based productivity, pigment complexes (HPLC/CHEMTAX) and species composition in the Cochin estuary (southwest coast of India) : special emphasis on diatoms

Paul, Meenu; Velappan, Madhu Nikathithara; Nanappan, Ullas; Gopinath, Vineetha; Velloth, Rehitha Thekkendavida; Rajendran, Ashwini; Nair, Maheswari; Peariya, Anil

doi:10.1016/j.oceano.2021.05.004

Artykuł - szczegóły

Tytuł artykułu

Characterization of phytoplankton size-structure based productivity, pigment complexes (HPLC/CHEMTAX) and species composition in the Cochin estuary (southwest coast of India) : special emphasis on diatoms

Autorzy

Paul Meenu , Velappan Madhu Nikathithara , Nanappan Ullas , Gopinath Vineetha , Velloth Rehitha Thekkendavida , Rajendran Ashwini , Nair Maheswari , Peariya Anil

Wybrane pełne teksty z tego czasopisma

Identyfikatory

DOI

10.1016/j.oceano.2021.05.004

Warianty tytułu

Języki publikacji

Abstrakty

Seasonal studies on size-fractionated phytoplankton productivity (biomass and primary production), marker pigments, and species composition and abundance were carried out in the Cochin estuary (CE), located on the southwest coast of India, to identify the critical environmental factors that control the consistent preponderance of diatoms. The overall results of the study showed a significant contribution of small-sized phytoplankton, specifically nanophytoplankton (2-20 µm), to the total chlorophyll a and primary production in the estuary, regardless of seasons. Diatoms constituted the major phytoplankton taxa, showed an exceptional seasonal scale increase in numerical abundance during the post-southwest monsoon. The relative increase in fucoxanthin (biomarker of diatoms) over other marker pigments substantiated the numerical dominance of diatoms throughout the sampling periods. This is the first study in the CE in which phytoplankton marker pigments have been detected and elucidated the seasonality of functional groups based on HPLC/chemotaxonomy analytical approaches. The prevalence of high Diat_DP and diatom chlorophyll a equivalent (estimated by CHEMTAX), further confirmed the preponderance of diatoms in the CE, despite the intermittent dominance of cyanophytes and cryptophytes (monsoon period). The consistent increase in SPM levels (> 25 mg L^–1), established at all sampling stations, indicated that the water column turbidity might be one of the significant environmental factors hindering the growth of large-sized phytoplankton (ca. >20 µm) in the CE even if the system invariably holds high inorganic nutrients, irrespective of seasons.

Słowa kluczowe

phytoplankton photopigments Cochin estuary diatoms fucoxanthin

Wydawca

Polish Academy of Sciences, Institute of Oceanology
Elsevier

Czasopismo

Oceanologia

Rocznik

2021

Tom

No. 63 (4)

Strony

463--481

Opis fizyczny

Bibliogr. 89 poz., rys., tab., wykr.

Twórcy

autor

Paul Meenu

CSIR – National Institute of Oceanography, Regional Centre, Kochi, India

autor

Velappan Madhu Nikathithara

nmadhu@nio.org

CSIR – National Institute of Oceanography, Regional Centre, Kochi, India

autor

Nanappan Ullas

CSIR – National Institute of Oceanography, Regional Centre, Kochi, India

autor

Gopinath Vineetha

CSIR – National Institute of Oceanography, Regional Centre, Kochi, India

autor

Velloth Rehitha Thekkendavida

CSIR – National Institute of Oceanography, Regional Centre, Kochi, India

autor

Rajendran Ashwini

CSIR – National Institute of Oceanography, Regional Centre, Kochi, India

autor

Nair Maheswari

CSIR – National Institute of Oceanography, Regional Centre, Kochi, India

autor

Peariya Anil

CSIR – National Institute of Oceanography, Regional Centre, Kochi, India

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