Browsing by Author "Pratihary, A.K."
Now showing items 21-40 of 40
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N2 production rates limited by nitrite availability in the Bay of Bengal oxygen minimum zone
Bristow, L.A.; Callbeck, C.M.; Larsen, M.; Altabet, M.A.; Dekaezemacker, J.; Forth, M.; Gauns, M.; Glud, R.N.; Kuypers, M.M.M.; Lavik, G.; Milucka, J.; Naqvi, S.W.A.; Pratihary, A.K.; Revsbech, N.P.; Thamdrup, B.; Treusch, A.H.; Canfield, D.E. (Macmillan Publishers Limited, 2017)A third or more of the fixed nitrogen lost from the oceans as N<sub>2</sub> is removed by anaerobic microbial processes in open ocean oxygen minimum zones. These zones have expanded over the past decades, and further ... -
Nitrogen fixation rates in the eastern Arabian Sea
Ahmed, A.; Gauns, M.; Kurian, S.; Bardhan, P.; Pratihary, A.K.; Naik, H.; Shenoy, D.M.; Naqvi, S.W.A. (Elsevier, 2017)The Arabian Sea experiences bloom of the diazotroph Trichodesmium during certain times of the year when optimal sea surface temperature and oligotrophic condition favour their growth. We measured nitrogen fixation rates ... -
Phytoplankton associated with seasonal oxygen depletion in waters of the western continental shelf of India
Gauns, M.; Mochemadkar, S.; Pratihary, A.K.; Shirodkar, G.; Narvekar, P.V.; Naqvi, S.W.A. (2020)We report here results of a time series study carried out to understand seasonal variability of phytoplankton in relation to changes in dissolved oxygen based on observations at the Candolim Time Series (CaTS) station ... -
Recurrence of Gonyaulax polygramma bloom in the southeastern Arabian Sea
Dias, A.B.; Kurian, S.; Neethu, T.V.; Gauns, M.; Khichi, R.; Pratihary, A.K.; Borker, S.G.; Shenoy, D.M. (Springer, 2023)Gonyaulax polygramma, a bloom-forming dinoflagellate, has been repeatedly observed along the southeastern Arabian Sea in recent years. During our study in October 2021, a patch of reddish-brown water was observed in the ... -
Response of oceanic subsurface chlorophyll maxima to environmental drivers in the Northern Indian Ocean
Garg, Shriya; Gauns, M.; Pratihary, A.K. (Elsevier, 2024)Subsurface Chlorophyll Maxima (SCM) contributes a significant proportion to depth-integrated ocean primary production, making it important to understand its spatiotemporal variability in changing environmental conditions. ... -
Response of phytoplankton to nutrient enrichment with high growth rates in a tropical monsoonal estuary - Zuari estuary, India
Mochemadkar, S.; Gauns, M.; Pratihary, A.K.; Thorat, B.R.; Roy, R.; Pai, I.K.; Naqvi, S.W.A. (CSIR-NISCAIR, 2013)Present study is about the impact of macronutrient enrichment on phytoplankton biomass and community structure in a tropical monsoonal estuary. In situ experiments carried out during the pre-monsoon period (February-March ... -
Rice husk as a potential source of silicate to oceanic phytoplankton
Shetye, S.S.; Pratihary, A.K.; Shenoy, D.M.; Kurian, S.; Gauns, M.; Uskaikar, H.; Naik, Bhagyashri; Nandakumar, K.; Borker, S. (Elsevier, 2023)Global oceans are witnessing changes in the phytoplankton community composition due to various environmental stressors such as rising temperature, stratification, nutrient limitation, and ocean acidification. The Arabian ... -
Sea foam-associated pathogenic bacteria along the west coast of India
Shetye, S.S.; Bandekar, M.; Nandakumar, K.; Kurian, S.; Gauns, M.; Jawak, S.; Pratihary, A.K.; Elangovan, S.S.; Naik, B.R.; Lakshmi, Sethu; Aswathi, V.K. (Springer Science and Business Media Deutschland GmbH, 2021)Anthropogenic activities release effluents containing nutrients and pathogenic bacteria that change the characteristics of coastal ecosystems. An important type of marine pollution which has occurred in 3 different states ... -
Seasonal anoxia over the western Indian continental shelf
Naqvi, S.W.A.; Naik, H.; Jayakumar, A.; Pratihary, A.K.; Shirodkar, G.; Kurian, S.; Agnihotri, R.; Shailaja, M.S.; Narvekar, P.V. (American Geophysical Union, 2009)The eastern Arabian Sea contains the only eastern-boundary-type upwelling environment in the entire Indian Ocean, albeit on a seasonal basis. During the southwest monsoon, when the surface current flows equatorward, upwelling ... -
Seasonal variations in abundance, biomass and grazing rates of microzooplankton in a tropical monsoonal estuary
Gauns, M.; Mochemadkar, S.; Patil, S.; Pratihary, A.K.; Naqvi, S.W.A.; Madhupratap, M. (Springer, 2015)Seasonal abundance, composition and grazing rates of microzooplankton (20–200 µm) in the Zuari estuary were investigated to evaluate their importance in food web dynamics of a tropical monsoonal estuary. Average abundances ... -
Seasonally varying biogeochemical regime around the coral habitats off central west coast of India
Shirodkar, G.; Naik, H.; Naqvi, S.W.A.; Pratihary, A.K.; Hussain, A.; Shenoy, D.M.; Gauns, M.; Manikandan, B.; Manjrekar, S.; Patil, Anagha (Elsevier, 2024)The Western Indian Continental Shelf (WICS) experiences upwelling during the Southwest Monsoon (SWM), leading to deoxygenation and acidification of subsurface waters. The region has patchy growth of corals, e.g. in the ... -
Sedimentary sulphate reduction and organic matter mineralization across salinity gradient of the Mandovi Estuary, West coast of India
Naik, R.; Araujo, J.; Pratihary, A.K.; Kurian, S.; Naqvi, S.W.A. (Elsevier, 2019)The Mandovi Estuary, located along the tropical west coast of India, transforms from being a freshwater-dominated body during the monsoon season to a tide-dominated system during post-monsoon season, with a salinity gradient ... -
Spatial and temporal variation of dissolved iodine in the eastern Arabian Sea
Shaikh, Adnan; Kurian, S.; Shenoy, D.M.; Pratihary, A.K.; Dais, A.B.; Naik, Richita; Borker, S.G. (Elsevier, 2023)Here we report the seasonal and spatial variation of iodide (I−) and total dissolved iodine (TI) along a transect covering the oxygen minimum zone (OMZ) in the Arabian Sea (AS). This data is generated after a gap of more ... -
Spatial variation of phytoplankton pigments along the southwest coast of India
Roy, R.; Pratihary, A.K.; Gauns, M.; Naqvi, S.W.A. (Elsevier, 2006)Phytoplankton composition and abundance were studied along the southwestern Indian coast toward the end of the upwelling season in October 2004. Phytoplankton pigment analyses, complemented by limited microscopic counts, ... -
The Arabian Sea as a high-nutrient, low-chlorophyll region during the late southwest monsoon
Naqvi, S.W.A.; Moffett, J.W.; Gauns, M.; Narvekar, P.V.; Pratihary, A.K.; Naik, H.; Shenoy, D.M.; Jayakumar, D.A.; Goepfert, T.J.; Patra, P.K.; Al-Azri, A.; Ahmed, S.I. (European Geosciences Union, 2010)Extensive observations were made during the late southwest monsoon of 2004 over the Indian and Omani shelves, and along a transect that extended from the southern coast of Oman to the central west coast of India, tracking ... -
The effect of organic carbon on fixed nitrogen loss in the eastern tropical South Pacific and Arabian Sea oxygen deficient zones
Chang, B.X.; Rich, J.R.; Jayakumar, A.; Naik, H.; Pratihary, A.K.; Keil, R.G.; Ward, B.B.; Devol, A.H. (Association for the Sciences of Limnology and Oceanography, 2014)The three major oxygen deficient zones (ODZs) of the world oceans (eastern tropical North and South Pacific (ETNP and ETSP, respectively), and Arabian Sea (AS) host the vast majority of pelagic fixed nitrogen (N) loss and ... -
The relationship between volatile halocarbons and phytoplankton pigments during a Trichodesmium bloom in the coastal eastern Arabian Sea
Roy, R.; Pratihary, A.K.; Shirodkar, G.; Mochemadkar, S.; Gauns, M.; Naqvi, S.W.A. (Elsevier, 2011)Eukaryotic phytoplankton such as diatoms and prymnesiophytes produce biogenic halocarbons in the ocean that serve as important sources of chlorine and bromine to the atmosphere, but the role of cyanobacteria in halocarbon ... -
Variations in some environmental characteristics including C and N stable isotopic composition of suspended organic matter in the Mandovi estuary
Maya, M.V.; Soares, M.A.; Agnihotri, R.; Pratihary, A.K.; Karapurkar, S.; Naik, H.; Naqvi, S.W.A. (Springer, 2011)Chemical and isotopic (delta sup(13)C and delta sup(15)N) investigation of the Mandovi estuary along the Indian west coast affected strongly by the seasonal monsoon cycle was carried out. The Mandovi estuary is a major ... -
Variations of Colored Dissolved Organic Matter in the Mandovi Estuary, Goa, During Spring Inter-Monsoon: A Comparison With COVID-19 Outbreak Imposed Lockdown Period
Dias, A.; Kurian, S.; Suresh, T.; Pratihary, A.K. (Frontiers, 2021)Colored dissolved organic matter (CDOM) is one of the important fractions of dissolved organic matter (DOM) that controls the availability of light in water and plays a crucial role in the cycling of carbon. High CDOM ... -
Water column characteristics following the September 2004 stench event off southern Malabar coast
Kurian, S.; Shenoy, D.M.; Gauns, M.; Roy, R.; Shirodkar, G.; Pratihary, A.K.; Paul, J.T. (NISCAIR, CSIR, 2007)An unusual stench emanated from the coastal waters of southwest coast of India during September 2004 associated with an algal bloom. Water samples collected from 14 stations from the affected area after three weeks of the ...