Browsing by Author "Madhu, N.V."
Now showing items 1-20 of 57
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Bioluminescence of green Noctiluca scintillans from the coastal waters of Kochi (southwest coast of India) and in vivo experiments on bioluminescence in response to mechanical stimuli and its diurnal variations
Parvathi, A.; Vishal, C.R.; Madhu, N.V.; Anil, P.; Iqbal, P.M.M.; Gopika, P.; Camey, M.F. (Taylor & Francis, 2021)A bloom of green Noctiluca scintillans (GNS) was spotted as conspicuous bright blue coloured bioluminescence in the coastal waters of Kochi on 29 May 2019. The intense blue colouration was visible in the inshore waters, ... -
Characterization of phytoplankton functional groups in a tropical shellfish harvesting estuary (Ashtamudi) and adjacent nearshore waters (southwest coast of India)
Anil, Peariya; Madhu, N.V.; Vishal, C.R.; Gopika, P.; Jyothi, S.; Arya, K.S.; Gireeshkumar, T.R. (Springer, 2023)A pioneering study on phytoplankton marker pigments, by adopting the HPLC-CHEMTAX analytical approach, was carried out in one of the major shellfish harvesting estuaries (Ashtamudi estuary�AE) on the southwest coast of ... -
Characterization of phytoplankton pigments and functional community structure in the Gulf of Mannar and the Palk Bay using HPLC–CHEMTAX analysis.
Madhu, N.V.; Ullas, N.; Ashwini, R.; Meenu, P.; Rehitha, T.V.; Lallu, K.R. (Elsevier, 2014)Phytoplankton marker pigments and their functional groups were identified for the first time in the Gulf of Mannar (GoM) and the Palk Bay (PB), located in the southeast coast of India using HPLC–CHEMTAX analytical techniques. ... -
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
Meenu, P.; Madhu, N.V.; Ullas, N.; Vineetha, G.; Rehitha, T.V.; Ashwini, R.; Nair, M.; Anil, P. (Elsevier, 2021)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 ... -
CO2 supersaturation and net heterotrophy in a tropical estuary (Cochin, India): Influence of anthropogenic effect - Carbon dynamics in tropical estuary
Gupta, G.V.M.; Thottathil, S.D.; Balachandran, K.K.; Madhu, N.V.; Madeswaran, P.; Nair, S. (Springer, 2009)Carbon biogeochemistry of a tropical ecosystem (The Cochin Estuary, India) undergoing increased human intervention was studied during February (premonsoon), April (early monsoon) and September (monsoon) 2005. The Cochin ... -
Comparative account on phytoplankton functional community dynamics in the Alappuzha mud bank region (southwest coast of India) by HPLC-CHEMTAX and microscopy approaches
Anil, P.; Madhu, N.V. (Elsevier, 2022)Phytoplankton community composition and its temporal dynamics were evaluated in the Alappuzha near shore waters (<15 m depth), including mud bank region, located along the southwest coast of India, using HPLC-derived marker ... -
Differential environmental responses of tropical phytoplankton community in the southwest coast of India
Madhu, N.V.; Martin, G.D.; Haridevi, C.K.; Nair, M.; Balachandran, K.K.; Ullas, N. (Elsevier, 2017)Phytoplankton characteristics (biomass, primary productivity, species composition and community structure) were studied in a tropical estuary (Cochin estuary) and adjacent coastal marine region for understanding the factors ... -
Differential response of winter cooling on biological production in the northeastern Arabian Sea and northwestern Bay of Bengal
Jyothibabu, R.; Maheswaran, P.A.; Madhu, N.V.; Asharaf, T.T.M.; Gerson, V.J.; Haridas, P.; Venugopal, P.; Revichandran, C.; Nair, K.K.C.; Gopalakrishnan, T.C. (Indian Academy of Sciences, 2004)The northern parts of the twin seas bordering the Indian subcontinent, the Arabian Sea (AS) and Bay of Bengal (BOB), were studied during the winter monsoon. Higher biological production was observed in the AS (chlorophyll ... -
Dominance of dinoflagellates in micro-zooplankton community in the oceanic regions of the Bay of Bengal and the Andaman Sea
Jyothibabu, R.; Madhu, N.V.; Maheswaran, P.A.; Nair, K.K.C.; Venugopal, P.; Balasubramanian, T. (Indian Academy of Sciences, 2003)Studies on microzooplankton, phytoplankton biomass (chlorophyll a) and production were conducted at five oceanic stations in the Bay of Bengal and Andaman sea onboard FORV Sagar Sampada during intermonsoon (March 2001). ... -
Ecological characterization of an unusual red tide (dinoflagellate-cyanobacterium consortium) in the coastal waters of Vizhinjam, southwest coast of India
Madhu, N.V.; Jithin ,P.E.; Sudheesh, P.; Jaleel, A.K.U.; Nishad,T.M. (Springer, 2025)An extensive reddish discoloration was observed in the nearshore waters (20 30 m depth) of Vizhinjam, located on the southwest coast of India, during the last week of October 2023. Microscopic analysis identified Ornithocercus ... -
Ecological habitat quality assessment of a tropical estuary using macrobenthic functional characteristics and biotic indices
Rehitha, T.V.; Vineetha, G.; Madhu, N.V. (Springer, 2022)Seasonal variation in the macrobenthic functional characteristics, such as trophic structure and secondary production, was studied, along with their structural characteristics such as density, biomass, and community ... -
Effects of hydrography on the distribution of bacteria and virus in Cochin Estuary, India
Parvathi, A.; Jasna, V.; Jina, S.; Jayalakshmy, K.V.; Lallu, K.R.; Madhu, N.V.; Muraleedharan, K.R.; NaveenKumar, K.R.; Balachandran, K.K. (Ecological Society of Japan, 2015)The viral dynamics have rarely been investigated in estuarine environments of India. The present study brings out a first hand information on the distribution of virus and bacteria in an eutrophic estuary (Cochin, India). ... -
Enhanced biological production off Chennai triggered by October 1999 super cyclone (Orissa)
Madhu, N.V.; Maheswaran, P.A.; Jyothibabu, R.; Sunil, V.; Revichandran, C.; Balasubramanian, T.; Gopalakrishnan, T.C.; Nair, K.K.C. (Indian Academy of Sciences, 2002)The results of physical forcings on primary production, its variation and associated hydrography of the southwestern Bay of Bengal during the southwest monsoon (July) and post-cyclone period (November) of 1999 were studied ... -
Enhanced chlorophyll a and primary production in the northern Arabian Sea during the spring intermonsoon due to green Noctiluca scintillans bloom
Madhu, N.V.; Jyothibabu, R.; Maheswaran, P.A.; Jayaraj, K.A.; Achuthankutty, C.T. (Taylor & Francis, 2012)The surface waters of the northeastern Arabian Sea sustained relatively high chlorophyll a (average 0.81+ or -0.80 mg m sup(-3)) and primary production (average 29.5+ or -23.6 mgC m sup(-3)d sup(-1)) during the early spring ... -
Environmentally-related seasonal variation in symbiotic associations of heterotrophic dinoflagellates with cyanobacteria in the western Bay of Bengal
Jyothibabu, R.; Madhu, N.V.; Maheswaran, P.A.; Devi, C.R.A.; Balasubramanian, T.; Nair, K.K.C.; Achuthankutty, C.T. (Balaban Publishers, 2006)In the western Bay of Bengal, some species of heterotrophic dinoflagellates recurrently show symbiotic associations with cyanobacteria (Synechococcus/Synechocystis). The occurrence of these associations is markedly higher ... -
Eutrophication induced changes in benthic community structure of a flow-restricted tropical estuary (Cochin backwaters), India
Martin, G.D.; Nisha, P.A.; Balachandran, K.K.; Madhu, N.V.; Nair, M.; Shaiju, P.; Joseph, T.; Srinivas, K.; Gupta, G.V.M. (Springer, 2011)The influence of anthropogenic loading on the distribution of soft bottom benthic organisms of a tropical estuary (Cochin backwaters) was examined. The industrial activities were found to be high in the northern and central ... -
Factors determining variations in viral abundance and viral production in a tropical estuary influenced by monsoonal cycles
Jasna, V.; Parvathi, A.; Aswathy, V.K.; Aparna, S.; Dayana, M.; Aswathy, A.J.; Madhu, N.V. (Elsevier, 2019)Viruses are the most abundant, dynamic, and ubiquitous components in the marine and estuarine environments. They outnumber prokaryotes in their abundance by at least one order of magnitude, but their relationship varies ... -
Formation of anoxia and denitrification in the bottom waters of a tropical estuary, southwest coast of India.
Martin, G.D.; Muraleedharan, K.R.; Vijay, J.G.; Rejomon, G.; Madhu, N.V.; Shivaprasad, A.; Haridevi, C.K.; Nair, M.; Balachandran, K.K.; Revichandran, C.; Jayalakshmy, K.V.; Chandramohanakumar, N. (Copernicus Publications, 2010)Hydrographic characteristics of the southwest coast of India and its adjoining Cochin backwaters (CBW) were studied during the summer monsoon. Anomalous formation of anoxia and denitrification were observed in the bottom ... -
Fresh water influence on nutrient stoichiometry in a tropical estuary, Southwest coast of India
Martin, G.D.; Vijay, J.G.; Laluraj, C.M.; Madhu, N.V.; Joseph, T.; Nair, M.; Gupta, G.V.M.; Balachandran, K.K. (Corvinus University of Budapest, 2008)Cochin backwaters, a micro tidal estuary, undergo a characteristic transformation from a river dominated system during summer monsoon to a tide-dominant system during pre-monsoon season. The present study observes that as ... -
Hydrographic and productivity characteristics along 45 degrees E longitude in the southwestern Indian Ocean and Southern Ocean during austral summer 2004
Jasmine, P.; Muraleedharan, K.R.; Madhu, N.V.; AshaDevi, C.R.; Alagarsamy, R.; Achuthankutty, C.T.; Jayan, Z.; Sanjeevan, V.N.; Sahayak, S. (Inter-Research, 2009)During the austral summer 2004, an intensive multidisciplinary survey was carried out in the Indian Ocean sector of the Southern Ocean to study the main hydrographic features and the associated productivity processes. This ...