Refine your search
Collections
Co-Authors
Journals
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Naqvi, S. W. A.
- Understanding our seas:National Institute of Oceanography, Goa
Abstract Views :203 |
PDF Views:84
Authors
Source
Current Science, Vol 108, No 10 (2015), Pagination: 1947-1947Abstract
No Abstract.- Understanding our Seas: National Institute of Oceanography, Goa
Abstract Views :253 |
PDF Views:86
Authors
Affiliations
1 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
1 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
Source
Current Science, Vol 108, No 8 (2015), Pagination: 1454-1460Abstract
The present article summarizes the research done at the CSIR-National Institute of Oceanography in 2014 in ocean science, resources and technology. Significant research has been conducted on air-sea interactions and coastal circulation, biogeochemistry, biology, marine geophysics, palaeoceanography, marine fishery, gas hydrates and wave energy. Technological advances covered topics like oceanographic tools. Major strides have been made in marine resources research and evaluation.Keywords
Air–Sea Interactions, Coastal Circulation, Marine Resources, Ocean Science.- Cyclone Phyan-Induced Plankton Community Succession in the Coastal Waters off Goa, India
Abstract Views :182 |
PDF Views:65
Authors
Affiliations
1 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
1 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
Source
Current Science, Vol 111, No 6 (2016), Pagination: 1091-1097Abstract
Effects of the cyclonic storm Phyan, which hit the states of Goa and Maharashtra in western India during 9-12 November 2009, on coastal waters were studied. Mixing induced by the cyclone appreciably affected the vertical thermohaline structure, composition and growth of plankton. The phytoplankton biomass increased by a factor exceeding 4, and a shift in phytoplankton community occurred with diatoms replacing dinoflagellates as the dominant group. A shift in zooplankton dominance from filter-feeders to herbivores and carnivores was also noticed. The results underline the sensitivity of coastal ecosystems to extreme events.Keywords
Chlorophyll, Coastal Waters, Cyclonic Storm, Phytoplankton, Zooplankton.- Fragilariopsis Sp. Bloom Causes Yellowish-Brown Waters Off Alappuzha, South-Central Kerala Coast, India, during the Mud Bank-Upwelling Phase
Abstract Views :217 |
PDF Views:84
Authors
R. Jyothibabu
1,
N. Arunpandi
1,
C. Karnan
1,
L. Jagadeesan
1,
T. M. Manojkumar
1,
K. K. Balachandran
1,
S. W. A. Naqvi
2
Affiliations
1 CSIR-National Institute of Oceanography, Regional Centre, Kochi 682 018, IN
2 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
1 CSIR-National Institute of Oceanography, Regional Centre, Kochi 682 018, IN
2 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
Source
Current Science, Vol 115, No 1 (2018), Pagination: 152-159Abstract
Mud banks (Chakara) of Kerala are calm coastal waters that form in several isolated stretches along the coast usually during the southwest monsoon (SWM) period (June–September). They are characterized by the damping of incident waves, generating localized calm sea environment conducive for fishing activities, while the high monsoon waves create hostile environment in the rest of the region. Here, we present the scientific basis of the yellowish-brown discoloration of water column that occurs off Alappuzha, Kerala annually during the peak and late SWM associated with coastal upwelling-mud bank event. The discoloured waters that occur off Alappuzha associated with these events are locally known as ‘pola vellam’, which is nothing but diatom blooms. In 2014, pola vellam was actually caused by the bloom of Fragilariopsis (= Fragilaria) sp.; hereafter Fragilariopsis, which was widespread in the study region, even beyond the mud bank domain. This bloom feature is attributable to the nutrient enrichment associated with intense coastal upwelling that was dominant over a larger spatial extent in the study domain, including the mud bank. FlowCAM-based plankton data strongly support the above view, as the abundance, biovolume and biomass of Fragilariopsis had similar temporal trend both in the mud bank and non-mud bank regions. The general ecology and importance of Fragilariopsis bloom in the study domain, from the point of view of commercial fisheries, is also elaborated in this communication.Keywords
Bloom, Coastal Upwelling, Fragilariopsis sp., Mud Bank, Fisheries.References
- Damodaran, R., Meio-benthos of the mud banks of Kerala coast. Proc. Indian Acad. Sci., Sect. B, 1972, 38, 288–297.
- Silas, E. G., Mud banks of Kerala–Karnataka: need for integrated study. CMFRI Bull., 1984, 31, 2–7.
- Regunathan, A., Mathew, K. J., Kurup, N. S. and Murty, A. V. S., Monsoon fishery and mud banks of Kerala coast. CMFRI Bull., 1981, 30, 37–41.
- Regunathan, A., Mathew, K. J., Rao, D. S., Gopinathan, C. P., Kurian, N. P. and Murty, A. V. S., Fish and fisheries of the mudbanks. CMFRI Bull., 1984, 31, 60–71.
- Karnan, C., Jyothibabu, R., Arunpandi, N., Jagadeesan, L., Prathihari, A., Balachandran, K. K. and Naqvi, S. W. A., Discriminating the role of coastal upwelling and mud bank in structuring the plankton size and lower level food web along the southwest coast of India. J. Mar. Syst., 2017, 172, 24–42.
- Jyothibabu, R., Balachandran, K. K., Jagadeesan, L., Karnan, C., Arunpandi, N., Naqvi, S. W. A. and Pandiyarajan, R. S., Mud bank along the southwest coast of India are not too muddy for plankton. Sci. Rep., 2018, 8, 2544.
- Murty, A. V. S., Rao, D. S., Reghunathan, A., Gopinathan, C. P. and Mathew, K. J., Ecology of mud banks-hypothesis on mud banks. CMFRI Bull., 1984, 31, 8–20.
- Banse, K., On the upwelling and bottom trawling off the south-west coast of India. J. Mar. Biol. Assoc. India, 1959, 1, 33–49.
- Banse, K., Hydrography of the Arabian Sea shelf of India and Pakistan and effects on demersal fishes. Deep-Sea Res. I, 1968, 15, 45–79.
- Nair, S. R. S., Devassy, V. P. and Madhupratap, M., Blooms of phytoplankton along the west coast of India associated with nutrient enrichment and the response of zooplankton. In Marine Coastal Eutrophication. The Response of Marine Transitional Systems to Human Impact: Problems and Perspectives for Restoration (eds Vollenweider, R. A., Marchetti, R., Viviani, R.), Elsevier, Amsterdam, The Netherlands, 1992, pp. 819–828.
- Madhupratap, M., Shetye, S. R., Nair, K. N. V. and Nair, S. R. S., Oil sardine and Indian mackerel: their fishery, problems and coastal oceanography. Curr. Sci., 1994, 66, 340–348.
- Jyothibabu, R. et al., The response of microzooplankton (20–200 μm) to coastal upwelling and summer stratification in the southeastern Arabian Sea. Cont. Shelf Res., 2008, 28, 653–671.
- Jyothibabu, R., Madhu, N. V., Habeebrehman, H., Jayalakshmy, K. V., Nair, K. K. C. and Achuthankutty, C. T., Re-evaluation of ‘paradox of mesozooplankton’ in the eastern Arabian Sea based on ship and satellite observations. J. Mar. Syst., 2010, 81, 235–251.
- Mann, K. H., Physical oceanography, food chains, and fish stocks: a review. ICES J. Mar. Sci., 1993, 50, 105–119.
- Cury, P., Bakun, A., Crawford, R. J. M., Jarre, A., Quinones, R. A., Shannon, L. J. and Verheye, H. M., Small pelagic in upwelling systems: patterns of interaction and structural changes in ‘wasp-waist’ ecosystems. ICES J. Mar. Sci., 2000, 57, 603–618.
- Grasshoff, K., In Methods of Seawater Analysis (eds Grasshoff, K., Ehrhardt, M. and Kremling, K.), Verlag Chemie, Weinheim, 1983, p. 419.
- United Nations Educational, Scientific and Cultural Organization (UNESCO), Protocols for the Joint Global Ocean Flux Study (JGOFS). Core measurements. UNESCO, Paris, 29, 1994, p. 170.
- Sieracki, C. K., Sieracki, M. E. and Yentsch, C. S., An imaging-in-flow system for automated analysis of marine microplankton. Mar. Ecol. Prog. Ser., 1998, 168, 285–296.
- Le Bourg, B., Cornet-Barthaux, V. R., Pagano, M. and Blanchot, J., FlowCAM as a tool for studying small (80–1000 μm) metazoo-plankton communities. J. Plankton Res., 2015, 37, 666–670.
- Mauchline, J., Blaxter, J. H. S. and Tyler, P. A., The biology of calanoid copepods. In Advances in Marine Biology, Academic Press, San Diego, CA. USA, 1998, vol. 33, p. 710.
- Karnan, C., Jyothibabu, R., Manoj Kumar, T. M., Jagadeesan, L. and Arunpandi, N., On the accuracy of assessing copepod size and biovolume using FlowCAM and traditional microscopy. Indian J. Geo-Mar. Sci., 2017, 46, 1261–1264.
- Zachariah, P. U. and Abdurahiman, K. P., Methods of stomach content analyses of fishes – building mass balance trophic and simulation models. Technical Notes, Central Marine Fisheries Research Institute (CMFRI), Kochi, 2004, p. 200.
- Nair, R. V. and Subrahmanyan, R., The diatom, Fragilaria oceanica Cleve, an indicator of abundance of the Indian oil sardine, Sardinella longiceps Cuv. and Val. Curr. Sci., 1955, 24, 41–42.
- Takabayashi, M., Lew, K., Johnson, A., Marchi, A. L., Dugdale, R. and Wilkerson, F. P., The effect of nutrient availability and temperature on chain length of the diatom, Skeletonema coastatum. J. Plankton Res., 2006, 28, 831–840.
- Subrahmanyan, R., Studies on the phytoplankton of the west coast of India. Proc. Indian Acad. Sci., Sect. B, 1959, 4, 189–252.
- Devassy, V. P., Observations on the bloom of a diatom Fragilaria oceanica Cleve. Mahasagar, 1974, 7, 101–105.
- Tomas, C. R., Identifying Marine Phytoplankton, Academic Press/Harcourt Brace, San Diego, CA, USA, 1997, p. 858.
- Mudbanks and Fisheries Along the Kerala Coast – Myth and Reality
Abstract Views :205 |
PDF Views:69
Authors
S. Prasanna Kumar
1,
P. K. Dinesh Kumar
2,
K. R. Muraleedharan
2,
Grinson George
3,
Dayana Mathew
2,
V. Kripa
3,
R. Jeyabaskaran
3,
N. Ramaiah
1,
A. Gopalakrishnan
3,
S. W. A. Naqvi
1
Affiliations
1 CSIR-National Institute of Oceanography, Dona Paula, Goa - 403 004, IN
2 CSIR-National Institute of Oceanography Regional Centre, Dr Salim Ali Road, Kochi - 682 018, IN
3 Central Marine Fisheries Research Institute, Ernakulam North PO, Kochi - 682 018, IN
1 CSIR-National Institute of Oceanography, Dona Paula, Goa - 403 004, IN
2 CSIR-National Institute of Oceanography Regional Centre, Dr Salim Ali Road, Kochi - 682 018, IN
3 Central Marine Fisheries Research Institute, Ernakulam North PO, Kochi - 682 018, IN
Source
Current Science, Vol 115, No 4 (2018), Pagination: 773-778Abstract
Mudbanks, a unique coastal oceanographic phenomenon occurring along the southwest (SW) coast of India during the SW monsoon season, are synonymous with the fishery of this region. Here we examine the validity of the popular notion that mudbanks directly support rich fisheries, using a high temporal resolution water column data collected from the Alappuzha mudbank region in Kerala during April to September 2014, in conjunction with fisheries data. Our study reveals that the upwelling which occurs during the SW monsoon season along this coast brings oxygen-deficient subsurface water to the upper water column. Escaping the oxygen-depleted waters, the fish aggregate within a thin upper layer allowing easy visual identification and capture of fish shoals. This process occurs throughout the coast and is not confined just to the mudbanks. Mudbank being a calm region, traditional fishermen using non-motorized country craft were able to carry out fishing within this region only during the SW monsoon. With the induction of motorized and mechanized fishing, the link between mudbanks and fisheries is becoming less prominent, although the former still continue to be important fish landing centres.Keywords
Mudbank, Monsoon, Suspended Sediments, Pelagic and Demersal Fishery, Upwelling.References
- Kurup, P. G., Studies on the physical aspects of the mudbanks along the Kerala coast with reference to the Purakkad mudbank. Bull. Dept. Mar. Sci., 1977, 8, 1–72.
- Dora, Y. L., Damodaran, R., Jose and Anto, V., Texture of Narakkal mudbank sediments. Bull. Dept. Mar. Biol. Oceanogr., 1968, 4, 1–10.
- Venkatachala, B. S., Kar, R. R., Suchindan, G. K., Ramachandran, K. K. and Kumar, M., Study on the sedimentary facies, sporepollen and palynodebris of mudbank and Vembanad Lake, Kerala. Geophytology, 1992, 22, 245–254.
- Gopinathan, C. K. and Qasim, S. Z., Mudbanks of Kerala their formation and characteristics. Indian J. Mar. Sci., 1974, 3, 105–114.
- Silas, E. G., Mudbanks of Kerala–Karnataka: need for an integrated study. Bull. Cent. Mar. Fish. Res. Inst., 1984, 31, 2–7.
- Macpherson, H. and Kurup, P. G., Wave dampening at Kerala mudbank. Indian J. Mar. Sci., 1981, 10, 154–160.
- Mathew, J., Baba, M. and Kurian, N. P., Mudbanks of the south west coast of India I: wave characteristics. J. Coast. Res., 1995, 11, 168–178.
- Erattupuzha, J. J. and Raman, H., Shore erosion and shore protection in Kerala. In Proceedings of the Symposium Coastal Erosion and Protection in Kerala, Kerala Engineering Research Institute, Peechi, 1971, pp. 7.1–7.15.
- Parvathy, K. G., Noujas, V., Thomas, K. V. and Ramesh, H., Impact of mudbanks on coastal dynamics, Aquatic Procedia, 2015, 4, 1514–1521.
- Pinkerton, Collection of voyages and travels. Administration Report of 1860 of Travancore.
- Dinesh Kumar, P. K., Balachandran, K. K., Prasanna Kumar, S. and Ramaiah, N., Workshop on mudbank. Indian J. Mar. Sci., 2014, 42, 954–955.
- Regunathan, A., Mathew, K. J., Rao, D. S., Gopinathan, C. P., Surendranatha Kurup, N. and Murty, A. V. S., Fish and fisheries of mudbank, Bull. Cent. Mar. Fish. Res. Inst., 1984, 31, 60–71.
- Grasshoff, K., Ehrhardt, M. and Kremling, K., In Methods of Seawater Analysis, Verlag Chemie, Weinheim, Germany, 1983, pp. 89–224.
- Gupta, G. V. M. et al., Evolution to decay of upwelling and associated biogeochemistry over the southeastern Arabian Sea shelf. J. Geophys. Res. Biogeosci., 2015, 121, 159–175; doi:10.1002/2015JG003163.
- Antony, M. K. and Unnikrishnan, A. S., On an upwelling front, propagation of upwelling and vertical velocity in the eastern Arabian Sea during monsoon, 1987. In Proceedings of the conference for Pacific Ocean Environments and Probing, Okinawa, 1992, vol. 1, pp. 527–532.