Browsing by Author "Pratihary, A.K."
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Anoxia over the western continental shelf of India: Bacterial indications of intrinsic nitrification feeding denitrification
Krishnan, K.P.; Fernandes, S.O.; LokaBharathi, P.A.; KrishnaKumari, L.; Nair, S.; Pratihary, A.K.; Rao, B.R. (Elsevier, 2008)Studies on the Arabian Sea coastal anoxia have been of immense interest, but despite its ecological significance there is sparse understanding of the microbes involved. Hence, observations were carried out off Goa (15 ... -
Benthic exchange along a tropical estuarine salinity gradient during dry season: Biogeochemical and ecological implications
Pratihary, A.K.; Naik, Richita; Karapurkar, S.; Gauthankar, M.; Khandeparker, R.; Manjrekar, S.; Gauns, M. (Elsevier, 2021)Benthic biogeochemistry and its coupling with pelagic ecology are less understood in tropical than in temperate estuaries, which have significant implications for global carbon and nutrient cycling. In dry season, the ... -
Benthic Exchange of Biogenic Elements in the Estuarine and Nearshore Waters of Western India
Pratihary, A.K. (2007)In order to get a quantitative understanding of coupling between benthic regeneration and fluxes with pelagic nutrient cycles and primary productivity in shallow environments of eastern Arabian sea, biogeochemical studies ... -
Benthic fluxes in a tropical estuary and their role in the ecosystem
Pratihary, A.K.; Naqvi, S.W.A.; Naik, H.; Thorat, B.R.; Shirodkar, G.; Manjunatha, B.R.; Rao, V.P. (Elsevier, 2009)In-situ measurements of benthic fluxes of oxygen and nutrients were made in the subtidal region of the Mandovi estuary during premonsoon and monsoon seasons to understand the role of sediment-water exchange processes in ... -
Benthic fluxes of methane along the salinity gradient of a tropical monsoonal estuary: Implications for CH4 supersaturation and emission
Araujo, J.; Pratihary, A.K.; Naik, R.; Naik, H.; Naqvi, S.W.A. (Elsevier, 2018)Observations in the Mandovi estuary, a typical tropical monsoonal estuary located on the west coast of India, revealed that waters were perennially supersaturated with CH4, indicating that the estuary could be a significant ... -
Benthic mineralization and nutrient exchange over the inner continental shelf of western India.
Pratihary, A.K.; Naqvi, S.W.A.; Shirodkar, G.; Kurian, S.; Naik, H.; Naik, R.; Manjunatha, B.R. (European Geosciences Union, 2014)The western Indian continental shelf is one of the most productive coastal systems of the world ocean. This system experiences extreme changes in its oxygen regime, being normoxic from November to May and suboxic ... -
Biogeochemistry and ecology of Pyrosoma spinosum from the Central Arabian Sea
Gauns, M.; Mochemadkar, S.; Pratihary, A.K.; Roy, R.; Naqvi, S.W.A. (Springer, 2015)Background: A swarm of pelagic tunicate (Pyrosoma spinosum) was found in the surface open waters of the Arabian Sea during late southwest monsoon (September 2007). The swarm site was characterized by moderate southwesterly ... -
Biogeochemistry of iron in the Arabian sea
Moffett, J.W.; Vedamati, J.; Goepfert, T.J.; Pratihary, A.K.; Gauns, M.; Naqvi, S.W.A. (Association for the Sciences of Limnology and Oceanography, 2015)The Arabian Sea is a productive basin where seasonal upwelling and convective mixing result in high surface nutrient concentrations and widespread algal blooms. The factors controlling primary productivity in the Arabian ... -
Chemolithoautotrophic denitrification intensifies nitrogen loss in the Eastern Arabian Sea Shelf waters during sulphidic events
Pratihary, A.K.; Lavik, G.; Naqvi, S.W.A.; Shirodkar, G.; Sarkar, Amit; Marchant, H.; Ohde, T.; Shenoy, D.M.; Kurian, S.; Uskaikar, H.; Kuypers, M.M.M. (Elsevier, 2023)The Eastern Arabian Sea Shelf i.e. Western Indian Continental Shelf (WICS) – a known biogeochemical hotspot is characterized by monsoonal upwelling, seasonal O2 deficiency, extremely high N2O build-up and sulphidic events. ... -
Coastal versus open-ocean denitrification in the Arabian Sea
Naqvi, S.W.A.; Naik, H.; Pratihary, A.K.; DeSouza, W.; Narvekar, P.V.; Jayakumar, D.A.; Devol, A.H.; Yoshinari, T.; Saino, T. (The European Geosciences Union, 2006)The Arabian Sea contains one of the three major open-ocean denitrification zones in the world. In addition, pelagic denitrification also occurs over the inner and mid-shelf off the west coast of India. The major differences ... -
Denitrification as the dominant nitrogen loss process in the Arabian Sea
Ward, B.B.; Devol, A.H.; Rich, J.J.; Chang, B.X.; Bulow, S.E.; Naik, H.; Pratihary, A.K.; Jayakumar, A. (Nature Publishing Group, 2009)Primary production in over half of the world’s oceans is limited by fixed nitrogen availability. The main loss term from the fixed nitrogen inventory is the production of dinitrogen gas (N sub(2)) by heterotrophic ... -
Denitrification exceeds anammox as a nitrogen loss pathway in the Arabian Sea oxygen minimum zone
Bulow, S.E.; Rich, J.J.; Naik, H.; Pratihary, A.K.; Ward, B.B. (Elsevier, 2010)The oxygen minimum zones (OMZs) of the world oceans are sites of enhanced anaerobic nitrogen transformations, such that the largest OMZ, the Arabian Sea, is responsible for 30-50% of the oceanic water column fixed N loss. ... -
Discriminating the biophysical impacts of coastal upwelling and mud banks along the southwest coast of India
Karnan, C.; Jyothibabu, R.; Arunpandi, N.; Jagadeesan, L.; Muraleedharan, K.R.; Pratihary, A.K.; Balachandran, K.K.; Naqvi, S.W.A. (Elsevier, 2017)Coastal upwelling and mud banks are two oceanographic processes concurrently operating along certain stretches of the southwest (Kerala) coast of India during the Southwest Monsoon period (June-September), facilitating ... -
Dissolved methane in Indian freshwater reservoirs
Shirodkar, G.; Naqvi, S.W.A.; Kurian, S.; Shenoy, D.M.; Pratihary, A.K.; Naik, H.; Patil, S.; Sarkar, A.; Gauns, M. (Springer, 2013)Emission of methane (CH4), a potent greenhouse gas, from tropical reservoirs is of interest because such reservoirs experience conducive conditions for CH4 production through anaerobic microbial activities. It has been ... -
Impact of lockdown on the environmental quality along the Indian coast and a tropical estuary
Karnan, C.; Sandhya, S.V.; Gauns, M.; Pratihary, A.K. (Elsevier, 2021)The COVID-19 lockdown significantly improved the global environmental quality by restricted anthropogenic activities. We aimed to understand the response of Indian coastal environmental quality and an estuarine (Zuari ... -
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 ... -
Malformation in coccolithophores in low pH waters: evidences from the eastern Arabian Sea
Shetye, S.S.; Gazi, S.; Arundhathy, M.; Shenoy, D.M.; Kurian, S.; Pratihary, A.K.; Shirodkar, G.; Mohan, Rahul; Dias, A.B.; Naik, H.; Gauns, M.; Nandakumar, K.; Borker, S. (Springer, 2023)Oceanic calcifying plankton such as coccolithophores is expected to exhibit sensitivity to climate change stressors such as warming and acidification. Observational studies on coccolithophore communities along with carbonate ... -
Massive Nitrogen Loss Over the Western Indian Continental Shelf During Seasonal Anoxia: Evidence From Isotope Pairing Technique
Sarkar, Amit; Naqvi, S.W.A.; Lavik, G.; Pratihary, A.K.; Naik, H.; Shirodkar, G.; Kuypers, M.M.M. (Frontiers Media SA, 2020)The western Indian continental shelf houses the world's largest naturally formed coastal low-oxygen zone that develops seasonally during the summer monsoon. We investigated multiple reductive nitrogen transformation pathways ... -
Methane dynamics in the shelf waters of the West coast of India during seasonal anoxia
Shirodkar, G.; Naqvi, S.W.A.; Naik, H.; Pratihary, A.K.; Kurian, S.; Shenoy, D.M. (Elsevier, 2018)The Western Continental Shelf of India experiences water-column anoxia during late summer/early autumn, thereby providing conducive conditions for methane (CH4) accumulation. Measurements of CH4 along with other ancillary ... -
Methane stimulates massive nitrogen loss from freshwater reservoirs in India
Naqvi, S.W.A.; Lam, P.; Shirodkar, G.; Sarkar, Amit; Naik, H.; Pratihary, A.K.; Shenoy, D.M.; Gauns, M.; Kurian, S.; Damare, S.R.; Duret, M.; Lavik, G.; Kuypers, M.M.M. (Nature Publishing Group, 2018)The fate of the enormous amount of reactive nitrogen released to the environment by human activities in India is unknown. Here we show occurrence of seasonal stratification and generally low concentrations of dissolved ...