Browsing by Author "Gireeshkumar, T.R."
Now showing items 1-20 of 36
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Aberrations in the microbiome of cyanobacteria from a tropical estuary polluted by heavy metals
Jasmin, C.; Anas, A.; Singh, D.; Purohit, H.J.; Gireeshkumar, T.R.; Nair, S. (Elsevier Ltd, 2020)The effect of heavy metal pollution on the microbiome of cyanobacteria in Cochin estuary (CE) on the southwest coast of India is reported in the study. Statistically significant difference in heavy metal concentration was ... -
Biochemical and stable carbon isotope records of mangrove derived organic matter in the sediment cores
Manju, M.N.; Resmi, P.; RatheeshKumar, C.S.; Gireeshkumar, T.R.; Chandramohanakumar, N.; Joseph, M.M. (Springer, 2016)Core sediments from five mangrove ecosystems along northern Kerala Coast were collected to evaluate the nature and sources of organic matter in these ecosystems. General sedimentary parameters (pH, Eh, grain size and total ... -
Bioconcentration of trace metals by Saccostrea cucullata (von Born 1778) from Andaman waters
Abhilash, K.R.; Gireeshkumar, T.R.; Venu, S.; Raveendran, T.V. (CSIR-NISCAIR, 2013)Assessment of trace metals (Zn, Cu, Fe, Pb and Ni) in water, sediment and an oyster, Saccostrea cucullata, was carried out in five stations around Port Blair. Concentration of these metals in water, sediment and the oyster ... -
Biophysical implications of the freshwater influx over small spatial scale in the coastal waters along the southwest coast of India during the Southwest Monsoon
Santhikrishnan, S.; Jyothibabu, R.; Albin, K.J.; Alok, K.T.; Karnan, C.; Arunpandi, N.; Camey, M.F.; Gireeshkumar, T.R. (Elsevier BV, 2021)This study in the coastal waters off Kochi along the southwest coast of India during the Southwest Monsoon (SWM) presents the biophysical implications of freshwater influx over a small spatial scale. Field sampling was ... -
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 ... -
Distribution and antibiotic resistance of vibrio population in an urbanized tropical lake-the Vembanad-in the southwest coast of India
Anas, A.; Hridya, K.V.; Devika, Raj; Menon, Nandini; George, G.; Reshma, Soman; Deepulal, P.M.; Ann, Mary; Kiran, K.; Gireeshkumar, T.R.; Sreelakshmi, P.K.; Tharakan, B.; Jasmin, C.; Platt, T.; Sathyendranath, S. (Springer, 2023)Among the diverse Vibrio spp. autochthonous to coastal ecosystems, V. cholerae, V. fluvialis, V. vulnificus and V. parahaemolyticus are pathogenic to humans. Increasing sea-surface temperature, sea-level rise and water-related ... -
Distribution and contamination status of phthalic acid esters in the sediments of a tropical monsoonal estuary, Cochin - India
Ramzi, A.; Gireeshkumar, T.R.; Rahman, H.K.; Manu, M.; Balachandran, K.K.; Chacko, J.; Chandramohanakumar, N. (Elsevier, 2018)Phthalic acid esters (PAEs) are a group of endocrine-disrupting chemicals listed as priority pollutants by United States Environmental Protection Agency (USEPA, 2009). This study provides baseline information on seasonal ... -
Distribution and sources of aliphatic hydrocarbons and fatty acids in surface sediments of a tropical estuary south west coast of India (Cochin estuary)
Gireeshkumar, T.R.; Deepulal, P.M.; Chandramohanakumar, N. (Springer, 2015)Surface sediments samples from the Cochin estuary were measured for elemental, stable isotopic and molecular biomarkers (aliphatic hydrocarbons and fatty acids) to study the sources and distribution of sedimentary organic ... -
Distribution and sources of fatty acids in surface sediments of mangrove ecosystems in the Northern Kerala Coast, India
Resmi, P.; Gireeshkumar, T.R.; RatheeshKumar, C.S.; Udayakrishnan, P.B.; Chandramohanakumar, N. (Taylor & Francis, 2023)Fatty acids and bulk geochemical proxies were employed to understand the sources and transformation of sedimentary organic matter from surface sediments of major five mangrove systems in the northern Kerala coast. Texture, ... -
Distribution, contamination status and bioavailability of trace metals in surface sediments along the southwest coast of India
Cyriac, M.; Gireeshkumar, T.R.; Furtado, C.M.; Fathin, K.P.F.; Shameem, K.; Shaik, Adnan; Vignesh, E.R.; Nair, M.; Kocherla, M.; Balachandran, K.K. (Elsevier, 2021)This study investigates the influence of upwelling induced seasonal hypoxia in the sediment-water interface on the distribution, bioavailability and geochemical partitioning of selected trace metals in surficial sediments ... -
Dynamics of nitrous oxide and methane in the southeastern Arabian Sea
Arya, K.S.; Gireeshkumar, T.R.; Vignesh, E.R.; Muraleedharan, K.R.; Jaleel, A.K.U.; Razaque, Abdul M.A.; Furtado, C.M.; Sudheesh, V.; Nair, T.M.B.; Krishnamohan, K.S. (Elsevier, 2024)This study examined the factors controlling the intra- and inter-seasonal variations of dissolved methane (CH4) and nitrous oxide (N2O) in the southeastern Arabian Sea (SEAS). Time-series measurements of CH4, N2O and allied ... -
Dynamics of polycyclic aromatic hydrocarbons (PAHs) in surface sediments of Cochin estuary, India
Ramzi, A.;; Rahman, K.H.; Gireeshkumar, T.R.; Balachandran, K.K.; Jacob, C.; Chandramohanakumar, N. (Elsevier, 2017)Polycyclic aromatic hydrocarbons (PAHs) showed significant seasonal dynamics in surface sediments of a tropical ecosystem (Cochin estuary, south west coast of India). Concentrations ranged from 304 to 5874 ngg<sup>-1</sup> ... -
Dynamics of trace metals in sediments of a seasonally hypoxic coastal zone in the southeastern Arabian Sea
Dayana, M.; Gireeshkumar, T.R.; Shameem, K.; Furtado, C.M.; Arya, K.S.; Udayakrishnan, P.B.; Balachandran, K.K. (Elsevier, 2022)This study examined the effect of water column hypoxia on the distribution and geochemical fractionation of trace metals in the seasonally hypoxic coastal environment in the southeastern Arabian Sea.Water and surface ... -
Editorial: Recent developments in oxygen minimum zones biogeochemistry
Bourbonnais, A.; Sudheesh, V.; Altabet, M.A.; Jayakumar, Amal; Naqvi, S.W.A.; Gireeshkumar, T.R. (Frontiers Media, 2023)This is an Editorial of the special issue of Frontiers in Marine Science on the Topic of recent developments in oxygen minimum zones biogeochemistry. This Research Topic presents 14 original research articles with the goal ... -
Factors influencing nearshore hypoxia in the southeastern Arabian Sea: A sensor-based study
AbdulAzeez, S.; Gireeshkumar, T.R.; Muraleedharan, K.R.; Vignesh, E.R.; Jaleel, A.K.U.; Arya, K.S.; Nair, R.C.; Ratheesh, R. (Elsevier, 2023)Seasonal upwelling and the associated incursion of hypoxic waters into the coastal zone is a widely studied topic over different upwelling zones. However, its persistence or variations over short time scales are poorly ... -
Geochemical speciation of iron under nearshore hypoxia: A case study of Alappuzha mud banks, southwest coast of India
Mathew, D.; Gireeshkumar, T.R.; Udayakrishnan, P.B.; Shameem, K.; Nayana, P.M.; Deepulal, P.M.; Sarath, R.; Nair, M.; Jaleel, A.K.U.; Balachandran, K.K. (Elsevier, 2022)Studies on the speciation of iron (Fe) and its regulatory roles in the biogeochemical cycling of other elements in the sediments of the Arabian Sea are limited. Changes in the reactivity and crystallinity of geochemical ... -
Heavy metals pollution influence the community structure of Cyanobacteria in nutrient rich tropical estuary
Anas, A.; Jasmin, C.; Sheeba V.A.; Gireeshkumar, T.R.; Nair, S. (OMICS International, 2015)Anthropogenic inputs influence the community structure and activities of microorganisms, which may impinge the functioning of estuarine and coastal ecosystem. The aim of the present study was to understand the influence ... -
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 upwelling induced near shore hypoxia on the Alappuzha mud banks, South West Coast of India
Gireeshkumar, T.R.; Mathew, D.; Pratihary, A.K.; Naik, H.; Narvekar, K.U.; Araujo, J.; Balachandran, K.K.; Muraleedharan, K.R.; Thorat, B.R.; Nair, M.; Naqvi, S.W.A. (Elsevier, 2017)The results of the first time-series measurements spanning 18-weeks (22 April to 20 September 2014) from a coastal environment (Alappuzha, southwest India), where two process of upwelling and mud banks are concurrent during ... -
Input-export fluxes of heavy metals in the Cochin estuary, southwest coast of India
Lallu, K.R.; Sebin, J.; Muraleedharan, K.R.; Gireeshkumar, T.R.; Udayakrishnan, P.B.; Dayana, M.; Sachin, M.; Revichandran, C.; Nair, M.; Parameswaran, P.S.; Balachandran, K.K. (Springer, 2023)Cochin estuary (CE) is one of the largest tropical estuaries along the southwest coast of India, sustaining rich bio-resources.Several studies enlighten the environmental changes in the CE caused by anthropogenic activities.In ...