Browsing by Author "Madhu, N.V."
Now showing items 21-40 of 55
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Impact of eutrophication on the occurrence of Trichodesmium in the Cochin backwaters, the largest estuary along the west coast of India
Martin, G.D.; Jyothibabu, R.; Madhu, N.V.; Balachandran, K.K.; Nair, M.; Muraleedharan, K.R.; Arun, P.K.; Haridevi, C.K.; Revichandran, C. (Springer, 2013)Phytoplankton studies in early 1970s have shown the annual dominance of diatoms and a seasonal abundance of Trichodesmium in the lower reaches of the Cochin backwaters (CBW) and adjacent coastal Arabian Sea during the ... -
Impact of freshwater influx on microzooplankton mediated food web in a tropical estuary (Cochin backwaters - India)
Jyothibabu, R.; Madhu, N.V.; Jayalakshmy, K.V.; Balachandran, K.K.; Shiyas, C.C.; Martin, G.D.; Nair, K.K.C. (Elsevier, 2006)The diversity, abundance and biomass of microzooplankton in Cochin backwaters were studied for the first time during pre – summer monsoon to peak of summer monsoon (April to July 2003) to understand the impact of large ... -
Impact of maintenance dredging on macrobenthic community structure of a tropical estuary
Rehitha, T.V.; Ullas, N.; Vineetha, G.; Benny, P.Y.; Madhu, N.V.; Revichandran, C. (Elsevier, 2017)This paper demonstrates the impact of maintenance dredging activities on the macrobenthic community structure of a tropical monsoonal estuary (Cochin estuary), located in the southwest coast of India for three consecutive ... -
Influence of allochthonous input on autotrophiceheterotrophic switch-over in shallow waters of a tropical estuary (Cochin Estuary), India
Thottathil, S.D.; Balachandran, K.K.; Gupta, G.V.M.; Madhu, N.V.; Nair, S. (Elsevier, 2008)Bacterial productivity (BP) and respiration (BR) were examined in relation to primary productivity (PP) for the first time in a shallow tropical ecosystem (Cochin Estuary), India. The degree of dependence of BP (6.3 199.7 ... -
Influence of hypoxia on phosphorus cycling in Alappuzha mud banks, southwest coast of India
Mathew, D.; Gireeshkumar, T.R.; Balachandran, K.K.; Udayakrishnan, P.B.; Shameem, K.; Deepulal, P.M.; Nair, M.; Madhu, N.V.; Muraleedharan, K.R. (2020)The southwest coast of India is known to experience two concurrent processes during the southwest monsoon, namely coastal upwelling and mud banks at selected stretches such as that off Alappuzha. The mud bank sediments ... -
Influence of oil and gas exploration activities on the macrobenthic community structure of the Krishna-Godavari basin (Ravva coast), Western Bay of Bengal
Rehitha, T.V.; Madhu, N.V.; Vipindas, P.V.; Vineetha, G.; Ullas, N.; Muraleedharan, K.R.; Nair, M. (Pergamon, 2021)The influence of oil and gas exploration activities on the macrobenthic community of an offshore oil and gas drilling site was investigated along the Krishna-Godavari basin (KG), Western Bay of Bengal. In the oil well ... -
Intense blooms of Trichodesmium erythraeum (Cyanophyta) in the open waters along east coast of India
Jyothibabu, R.; Madhu, N.V.; Murukesh, N.; Haridas, P.; Nair, K.K.C.; Venugopal, P. (NISCAIR, CSIR, 2003)Two blooms of Trichodesmium erythraeum were observed during April 2001, in the open waters of Bay of Bengal and this is the first report from this region. The locations of the bloom were off Karaikkal (10°58'N, 81°50'E) ... -
Inter-annual variations in the hydrochemistry of Alappuzha mud banks, southwest coast of India
Dayana, M.; Gireeshkumar, T.R.; Udayakrishnan, P.B.; Muraleedharan, K.R.; Madhu, N.V.; Nair, M.; Revichandran, C.; Balachandran, K.K. (Elsevier, 2019)The changes in the hydro-chemical properties of a near shore waters of Alappuzha, southwest coast of India, where the mud banks and coastal upwelling are co-existent, are presented based on two time-series measurements ... -
Lack of seasonality in phytoplankton standing stock (chlorophyll a) and production in the western Bay of Bengal
Madhu, N.V.; Jyothibabu, R.; Maheswaran, P.A.; Gerson, V.J.; Gopalakrishnan, T.C.; Nair, K.K.C. (Elsevier, 2006)The investigations in the western Bay of Bengal (BoB) during summer, winter and spring intermonsoon periods evidenced lack of pronounced seasonal variation in phytoplankton standing stock (chlorophyll a) and primary ... -
Macrobenthic fauna with special reference to the ecology and population structure of a tubicolous amphipod, Chelicorophium madrasensis (Nayar, 1950) in a tropical estuary, southwest coast of India
Rehitha, T.V.; Madhu, N.V.; Vineetha, G.; Vipindas, P.V.; Lallu, K.R. (2019)The ecology and population structure of the corophid amphipod Chelicorophium madrasensis (Nayar, 1950) was studied for 1�year in the Cochin estuary (CE), a tropical monsoonal estuary along the southwest coast of India. The ... -
Monsoon-induced changes in the size-fractionated phytoplankton biomass and production rate in the estuarine and coastal waters of southwest coast of India
Madhu, N.V.; Jyothibabu, R.; Balachandran, K.K. (Springer, 2010)Changes in the autotrophic pico- (0.2– 2 μm), nano- (2–20 μm), and microplankton (>20 μm) biomass (chlorophyll a) and primary production were measured in the estuarine and coastal waters off Cochin, southwest coast of ... -
Monsoonal impact on planktonic standing stock and abundance in a tropical estuary (Cochin backwaters - India)
Madhu, N.V.; Jyothibabu, R.; Balachandran, K.K.; Honey, U.K.; Martin, G.D.; Vijay, J.G.; Shiyas, C.A.; Gupta, G.V.M.; Achuthankutty, C.T. (Elsevier, 2007)Environmental studies in the Cochin backwaters (CBW), a tropical estuary along the southwest coast of India showed that seasonal fluctuation in salinity created by the monsoonal rainfall and associated run off is the major ... -
Occurrence of cyanobacteria (Richelia intracellularis)-diatom (Rhizosolenia hebetata) consortium in the Palk Bay, southeast coast of India
Madhu, N.V.; Paul, M.; Ullas, N.; Ashwini, R.; Rehitha, T.V. (CSIR-NISCAIR, 2013)Symbiotic association of heterocystous cyanobacterium, Richelia intracellularis Schmidt with oceanic centric diatom, Rhizosolenia hebetata is reported from the Palk Bay, southeast coast of India. One to six trichomes of ... -
Occurrence of red tide caused by Karenia mikimotoi (toxic dinoflagellate) in the Southwest coast of India
Madhu, N.V.; Reny, P.D.; Paul, M.; Ullas, N.; Resmi, P. (NISCAIR (CSIR), 2011)Intense brownish discoloration was observed in the surface waters of Cochin barmouth on 21st October 2009, which found to extend a few kilometers in the coastal waters. Continuous monitoring was carried out in the region ... -
Occurrence of white gelatinous foam on the beaches of Kollam (southwest coast of India) due to the senescent bloom of Phaeocystis globosa
Madhu, N.V.; Anil, P.; Vishal, C.R.; Muraleedharan, K.R.; Parvathi, A.; Gireeshkumar, T.R.; Arya, K.S.; Hafza, S. (Current Science Association, IAS, 2020)An unusual white gelatinous foam (~2 ft high) was detected on the beaches of Kollam (Mundakkal), Kerala, southwest coast of India. It extended to ~300 m alongshore on 10 June 2019 from 7 am and sustained till around 10 am. ... -
Ocean currents structuring the mesozooplankton in the Gulf of Mannar and the Palk Bay, southeast coast of India
Jagadeesan, L.; Jyothibabu, R.; Anjusha, A.; Mohan, A.P.; Madhu, N.V.; Muraleedharan, K.R.; Sudheesh, K. (Elsevier, 2013)We hypothesis perceptible physical barriers that exist between the deep Gulf of Mannar and shallow Palk Bay located between India and Sri Lanka, and seasonally reversing surface circulation patterns in the region have a ... -
Oscillating environmental responses of the eastern Arabian Sea
Gerson, V.J.; Madhu, N.V.; Jyothibabu, R.; Balachandran, K.K.; Nair, M.; Revichandran, C. (CSIR-NISCAIR, 2014)Characteristics of two distinct physical processes, the coastal upwelling and convective overturning, which enhance phytoplankton productivity in the west coast of India, are discussed in this study. Systematic in-situ ... -
Phytoplankton characterisation in the Alappuzha mud banks during the pre-/post phases of a red-tide, Prorocentrum shikokuense Hada
Madhu, N.V.; Anil, P.; Gireeshkumar, T.R.; Muraleedharan, K.R.; Kiran, K.; Vishal, C.R. (Elsevier, 2020)The short-term changes in hydrochemical and phytoplankton characteristics occurring in the Alappuzha mud bank (AMB) region, located on the southwest coast of India, were monitored in association with a red-tide event caused ... -
Phytoplankton size structure in the southern Bay of Bengal modified by the Summer Monsoon Current and associated eddies: Implications on the vertical biogenic flux..
Jyothibabu, R.; Vinayachandran, P. N.; Madhu, N.V.; Robin, R.S.; Karman, C.; Jagadeesan, L.; Anjusha, A. (Elsevier, 2015)The present study combines field and satellite observations to investigate how hydrographical transformations influence phytoplankton size structure in the southern Bay of Bengal during the peak Southwest Monsoon/Summer ... -
Re-evaluation of ‘paradox of mesozooplankton’ in the eastern Arabian Sea based on ship and satellite observations
Jyothibabu, R.; Madhu, N.V.; Habeebrehman, H.; Jayalakshmy, K.V.; Nair, K.K.C.; Achuthankutty, C.T. (Elsevier, 2010)In the central and eastern Arabian Sea (EAS), biomass and production of phytoplankton are known to vary spatially and seasonally whereas, biomass of mesozooplankton (MSP) is reported to be constant. This apparent contradiction ...