Anil Kumar Vijayan

Anil Kumar Vijayan
Centre For Marine Living Resources and Ecology | CMLRE · Ministry of Earth Sciences

Ph.D

About

36
Publications
8,447
Reads
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226
Citations
Additional affiliations
April 2004 - March 2008
The University of Tokyo
Position
  • PhD Student

Publications

Publications (36)
Article
Full-text available
Particulate organic carbon (POC) and its variability were studied to assess the accuracy of ocean colour retrieval algorithms over the eastern Arabian Sea (EAS) as it controls the carbon sequestration, oxygen minimum zone and biogeochemical (C, N and P) cycles. The seasonality in the physical and biological processes strongly influenced the distrib...
Article
Full-text available
Changes in macrozoobenthic standing stock and composition along the south-eastern Arabian Sea continental shelf (30–200 m) are investigated, based on data collected from the same sites during the same season 14 years apart (winter monsoon, 1998 and 2012), using the same platform, sampling gear, methods etc. During both surveys, polychaetes dominate...
Article
Full-text available
The oxygen minimum zone (OMZ) in the eastern Arabian Sea (EAS, ∼6° to 21°N), within Indian Exclusive Economic Zone (EEZ), is mapped, for the first time, for one year through ten repeated ship-based observations between December 2017 and January 2019 at seven to ten stations along the 2000 m depth contour. On an annual basis, the OMZ (<20 µM oxygen)...
Article
The quantity of floating plastic debris (FPD) is continuously being increased in the oceans. To assess their size, structure, and composition along the eastern Arabian Sea (EAS), FPD samples were collected by using a surface plankton net. The microplastic size fraction (0.5–5mm) was the most prevalent accounting for >50% of the total, followed by m...
Article
Full-text available
The growing number of oxygen-deficient coastal zones around the world and their impacts on marine life has always been a controversial issue as their development is largely attributed to anthropogenic activities which can be mitigated by human actions. However, contrary to this prevailing understanding, we show here for the first time, using new co...
Article
Coastal upwelling in the south eastern Arabian Sea (SEAS) leads to oxygen depletion over the continental shelf during the summer monsoon season (June–September), with latitudinal gradients in intensity. Based on two surveys in the onset (June) and peak (August) phases of the summer monsoon, the present study evaluates the response of macrozoobenthi...
Article
The paper describes the community composition of phytoplankton in the eastern Arabian Sea (EAS) during winter monsoon (WM, January-February 2018), encompassing the entire eastern part of the Arabian Sea basin (~ 6-22°N and 77-67°E) with high-resolution sampling (7 transects, 56 sites), from coastal to offshore regions. The phytoplankton pigment con...
Article
Full-text available
Marine soft-sediments sustain functionally important benthic assemblages that are critical for remineralization of organic matter and supply of nutrients to the water column. While these assemblages are well studied along continental margins, investigations from insular margin that surround oceanic islands are very limited. This paper examines the...
Article
The South Eastern Arabian Sea (SEAS) margin represents a tropical eastern boundary upwelling system, which is subjected to intense seasonal hypoxia in the continental shelf, and impingement of oxygen minimum zone (OMZ) along the continental slope. This paper provides the first comprehensive information on abundance, diversity and distribution patte...
Article
The response of the plankton community (micro- herein after MZP and mesozooplankton) to the seasonal intrusion of Bay of Bengal (BoB) water into the Arabian Sea from November (Initial Phase-IP) to January (Peak Phase-PP) and resultant stratification was tracked in the present study. During the winter monsoon (November –February) as part of seasonal...
Article
Full-text available
Winter cooling and persistent mixing for more than a quarter of year (November to early March) along the North Eastern Arabian Sea (NEAS) results in nutrient enrichment of the euphotic column thereby triggering biological production. Hydrographic characteristics of NEAS during Late Winter Monsoon (LWM) and Early Spring Inter Monsoon (ESIM) and the...
Article
Full-text available
A monospecific bloom of thecate dinoflagellate Gonyaulax polygramma (5x 108 cells L-1) was observed from the shelf waters off Mangalore (South Eastern Arabian Sea) during late summer monsoon. The bloom was observed to be subsurface (~5m depth) with chlorophyll a maxima of 13.15 µg L-1. The species observed to be photosynthetic and no visible food v...
Article
The southeastern Arabian Sea (SEAS) is a distinct ecosystem within the northern Indian Ocean, with unique physical, chemical and biological attributes. This paper provides comprehensive documentation on echinoderm diversity in the SEAS at depths of 20 to 1500 m, based on systematic surveys of over 300 sites. A total of 76 species were recorded in t...
Article
Full-text available
Crab jubilee associated with red tide of Noctiluca was observed along the central Kerala coast during the summer monsoon of 2013. There was an unusual shoreward mass movement of blue swimming crab Portunus pelagicus throughout the day. Hypoxia caused by red tide of Noctiluca in the coastal waters as well as sluggish upwelling by fresh water surfaci...
Article
Phytoplankton modify the optical properties of the seawater by altering the subsurface light field. Information on the accessory pigments present in the phytoplankton helps to differentiate major phytoplankton classes or taxonomic groups. The variability in the absorption spectra of phytoplankton and particulate matter of case 2 coastal waters of t...
Article
A new species of polychaete, Armandia sampadae was collected from shallow sandy sediments off Rutland Island (57 m depth) and off North Andaman (52 m depth) during a benthic survey along the continental shelf of Andaman and Nicobar Islands. The major character which distinguishes this species from other members of the genus Armandia is the presence...
Article
Full-text available
Phytoplankton modify the optical properties of the seawater by altering the subsurface light field. Information on the accessory pigments present in the phytoplankton helps to differentiate major phytoplankton classes or taxonomic groups. The variability in the absorption spectra of phytoplankton and particulate matter of case 2 coastal waters of t...
Article
Full-text available
S. S. Shaju, P. Minu, A. S. Srikanth, P. Muhamed Ashraf, A. K. Vijayan, B. Meenakumari. Oceanological and Hydrobiological Studies. Volume 44, Issue 3, Pages 282–293, ISSN (Online) 1897-3191, ISSN (Print) 1730-413X, Sep.2015
Article
Full-text available
Marine epizoic diatom, Pseudohimantidium pacificum Hustedt and Krasske 1941, on copepod Corycaeus affinis is reported for the first time in North Eastern Arabian Sea. It was found attached exclusively to copepod C. affinis. Light Microscope and Scanning Electron Microscopic studies were made to examine the frustule morphology. With the present repo...
Article
Full-text available
The Cypridina dentata samples collected from North Eastern Arabian Sea, during spring inter monsoon were infested with protozoan epibionts in densities of 10 to 24 individuals per ostracod. Epibionts are suctorian ciliate protozoan species Acineta satyanandani and Paracineta karunakarani. Epibionts colonized the entire body surface, but were most n...
Article
The deep-water brittle star Ophiomyces delata Koehler, 1904 is reported from the Duncan Passage, Andaman Islands, for the first time, at a relatively shallow depth of 56 m. A detailed description of the specimens is provided, as the genus Ophiomyces comprises nine nominal species that exhibit morphological plasticity and have considerable overlap i...
Article
The south eastern Arabian Sea is characterized by intense coastal upwelling, high biological production and subsurface oxygen depletion during the southwest monsoon (June-September). Concurrently, a seasonal closure to trawling activities (15th June to 31st July) is implemented here, as a sustainable ecosystem management practice. The effects of mo...
Conference Paper
The winter monsoon season, spanning from November to February usually represents a quiescent period of the South Eastern Arabian Sea (SEAS). Seasonally reversing circulation plays an important role in exchanging water mass between the Arabian Sea and Bay of Bengal. lntrusion of BoB low saline water starts in November concurrent with the initial pha...
Article
A new paramicrolaimid nematode, Paramicrolaimus damodarani sp. nov., is described based on specimens from the continental shelf (95 m) of the south eastern Arabian Sea. Paramicrolaimus damodarani sp. nov. differs from other known species of the genus in having a smaller body size, form of the spicular apparatus, presence of 7 cuticularised protrudi...
Article
Full-text available
Neoceratium platycorne (Daday) F. Gomez, D. Moreira, P. Lopez-Garcia is reported for the first time from the North Eastern Arabian Sea (NEAS). The species was observed in the open ocean subsurface waters of NEAS during the late winter monsoon period. The cell density of the N. platycorne was 10-15 cells L-1. This record will contribute to the phyto...
Data
The light absorption properties of a dinoflagellate (Noctiluca scintillans Macartney) bloom in Manila Bay were analysed during the onset of a whole-bay-scale bloom in March 2004. The chlorophyll a concentrations varied over a very wide range from 1.4 µg l −1 to extremely high values of 521 µg l −1 . The chlorophyll specific absorp-tion coefficients...
Article
The light absorption properties of a dinoflagellate (Noctiluca scintillans Macartney) bloom in Manila Bay were analysed during the onset of a whole-bay-scale bloom in March 2004. The chlorophyll a concentrations varied over a very wide range from 1.4,mu g 1(-1) to extremely high values of 521 mu g 1(-1). The chlorophyll specific absorption coeffici...
Article
Full-text available
Regional variations in the contribution of non-photosynthetic pigments (ā np*) to the total light absorption of phytoplankton (ā ph*) and its influence on the maximum quantum yield of photosynthesis (φ m) were investigated. In the western equatorial Pacific, the surface ā np* : ā ph* ratio was higher in the western warm pool than that in the upwell...
Article
Full-text available
Noctiluca scintillans, which contains a photosynthetic endosymbiont, Pedinomonas noctilucae, formed perennial red tides in Manila Bay, Philippines, occasionally covering almost whole area since 2001. A whole-bay scale red tide of the green Noctiluca in Manila Bay is described as the first step to elucidate the formation mechanism of the large scale...

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Projects

Project (1)
Project
Arabian Sea Carbon and Nitrogen biogeochemistry. Upwelling and OMZ interactions. Primary Production and Greenhouse Gases. Anthropogenic effects on Coastal Seas. Food-web dynamics and Fishery Oceanography