10 results on '"George, Grinson"'
Search Results
2. Spatial structuring of silver pomfret Pampus candidus in Northern Indian Ocean using microsatellite DNA
- Author
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George Grinson, V. S. Basheer, P. R. Divya, C. Mohitha, Linu Joy, and A. Gopalakrishnan
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Pomfret ,education.field_of_study ,biology ,Population ,Aquatic Science ,biology.organism_classification ,Fishery ,Indian ocean ,Geography ,Insect Science ,BENGAL ,Genetics ,Polymorphic Microsatellite Marker ,Microsatellite ,Animal Science and Zoology ,Fisheries management ,education ,Bay ,Biotechnology - Abstract
Silver pomfrets are spread along the Indo-West Pacific: from the Persian Gulf to Indonesia, Japan, West and Southwest of Korea and Eastern parts of China and forms a commercial fishery in all these countries. For formulating fishery management strategy of the silver pomfret, accurate population information is necessary. The genetic stock structure of silver pomfret in the Northern Indian Ocean was explored using 12 polymorphic microsatellite markers. Morphological and molecular studies confirmed that the silver pomfrets along the Northern Indian Ocean is Pampus candidus. Pampus candidus populations along Arabian Sea and Bay of Bengal region (FST =0.049, P
- Published
- 2021
3. Climatic Projections of Indian Ocean During 2030, 2050, 2080 with Implications on Fisheries Sector
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Puthenthara Madhusoodanan Lakshmi, G Rojith, Sudhakaran Ajith, George Grinson, V H Sajna, Paruthiyazhath Joshy Akhiljith, Vazhamattom Benjamin Liya, P. U. Zacharia, and T V Sathianandan
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Adaptive strategies ,010504 meteorology & atmospheric sciences ,Ecology ,010505 oceanography ,business.industry ,Climate change ,01 natural sciences ,Fishery ,Indian ocean ,Geography ,Aquaculture ,business ,0105 earth and related environmental sciences ,Earth-Surface Processes ,Water Science and Technology - Abstract
Akhiljith, P.J.; Liya, V.B.; Rojith, G.; Zacharia, P.U.; Grinson, G.; Ajith, S.; Lakshmi, P.M.; Sajna, V.H., and Sathianandan, T.V., 2019. Climatic projections of Indian ocean during 2030,...
- Published
- 2019
4. Time Series Analysis of CMIP5 Model and Observed Sea Surface Temperature Anomaly Along Indian Coastal Zones
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George Grinson, Dhanya Joseph, P U Zacharia, G Rojith, and Vazhamattom Benjamin Liya
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Sea surface temperature ,010504 meteorology & atmospheric sciences ,Ecology ,010505 oceanography ,Climatology ,Anomaly (natural sciences) ,Climate change ,Time series ,01 natural sciences ,Geology ,0105 earth and related environmental sciences ,Earth-Surface Processes ,Water Science and Technology - Abstract
Joseph, D.; Liya, V.B.; Rojith, G.; Zacharia, P.U., and Grinson, G., 2019. Time series analysis of CMIP5 model and observed sea surface temperature anomaly along Indian coastal zones. In: ...
- Published
- 2019
5. Production, Characterization and Observation of Higher Carbon in Sargassum wightii Biochar From Indian Coastal Waters
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G Rojith, Ramachandran Nikki, George Grinson, Sudhakaran Ajith, P U Zacharia, Vazhamattom Benjamin Liya, and V H Sajna
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010504 meteorology & atmospheric sciences ,Ecology ,biology ,010505 oceanography ,business.industry ,chemistry.chemical_element ,Carbon sequestration ,biology.organism_classification ,01 natural sciences ,Brown algae ,Nutrient ,Aquaculture ,Algae ,chemistry ,Environmental chemistry ,Biochar ,Environmental science ,business ,Carbon ,Pyrolysis ,0105 earth and related environmental sciences ,Earth-Surface Processes ,Water Science and Technology - Abstract
Ajith, S.; Rojith, G.; Zacharia, P.U.; Nikki, R.; Sajna, V.H.; Liya, V.B., and Grinson, G., 2019. Production, characterization and observation of higher carbon in Sargassum wightii biochar from Indian coastal waters. In: Jithendran, K.P.; Saraswathy, R.; Balasubramanian, C.P.; Kumaraguru Vasagam, K.P.; Jayasankar, V.; Raghavan, R.; Alavandi, S.V., and Vijayan, K.K. (eds.), BRAQCON 2019: World Brackishwater Aquaculture Conference. Journal of Coastal Research, Special Issue No. 86, pp. 193–197. Coconut Creek (Florida), ISSN 0749-0208.Seaweed farming gains significance as a climate resilient strategy owing to significant carbon sequestration potential and research advances to valorize products from seaweed resources. Conversion of seaweeds to biochar enhances further carbon sequestration. In this study Sargassum wightii, belonging to brown algae has been converted into biochar under different conditions of pyrolysis for possible application in aquaculture sector. The prepared biochar was subjected to elemental (CHNS) analysis to assess the nutrient profile. Further, comparative analysis has been done on raw seaweed and biochar based on the structural characterization using SEM, XRD and FTIR spectra. Functional group changes were evidenced from FTIR and XRD spectra, whereas surface modifications were elucidated by SEM analysis. The optimum temperature for biochar pyrolysis of S. wightii to yield higher carbon content has been identified. A significant observation is that seaweeds in Indian coastal waters are capable of higher carbon sequestration than in other waters.
- Published
- 2019
6. Effect of Climatic Variability on the Fishery of Indian Oil Sardine Along Kerala Coast
- Author
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Kuriakose Somy, Pariappanal Ulahannan Zacharia, George Grinson, V H Sajna, Vazhamattom Benjamin Liya, Dhanya Joseph, and G Rojith
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010504 meteorology & atmospheric sciences ,Ecology ,biology ,010505 oceanography ,business.industry ,Sardine ,Generalized additive model ,Climate change ,Pelagic zone ,biology.organism_classification ,01 natural sciences ,Fishery ,Sea surface temperature ,Aquaculture ,Indian oil sardine ,Environmental science ,Sardinella ,business ,0105 earth and related environmental sciences ,Earth-Surface Processes ,Water Science and Technology - Abstract
Sajna, V.H.; Zacharia P.U.; Liya, V.B.; Rojith, G.; Somy, K.; Joseph, D., and Grinson, G., 2019. Effect of climatic variability on the fishery of Indian Oil sardine along Kerala coast. In: Jithendran, K.P.; Saraswathy, R.; Balasubramanian, C.P.; Kumaraguru Vasagam, K.P.; Jayasankar, V.; Raghavan, R.; Alavandi, S.V., and Vijayan, K.K. (eds.), BRAQCON 2019: World Brackishwater Aquaculture Conference. Journal of Coastal Research, Special Issue No. 86, pp. 184–192. Coconut Creek (Florida), ISSN 0749-0208.Indian oil sardine (IOS), the commercially and ecologically important pelagic fish of the Kerala coast is susceptible to climatic variation. The study analyzes the impact of climate change on the catch of Sardinella longiceps along the Kerala coast and tries to predict the catch trend under the two RCP scenarios 4.5 and 6.0 for the period 2020-2100. Monthly catch of IOS by major gears for the period 1990-2016 was collected and Relative effort (Effort) and Weighted CPUE (cpue) were accordingly estimated. The climatic variables Sea Surface Temperature (SST), Precipitation (Pr), Chlorophyll a (SSC) and Salinity (SSS) were obtained from NOAA/NASA. The relationship of cpue and Effort of IOS to environmental variables were explored by Generalized Additive Model. The best fit model was selected using lowest Akaike information criterion (AIC) value, Deviance and F statistic. Predictions of cpue and Effort under RCP 4.5 and RCP 6.0 were done and the catch of IOS was estimated. The GAM model revealed the variations in the catch of IOS in relation to climate change. The SST, SSS and Pr showed a negative relation whereas SSC was found to be positively related to the catch of IOS. The results of the study indicate a decreasing trend of cpue and catch and an increasing trend of Effort towards 2100 under both climate change scenarios.
- Published
- 2019
7. New insights from nuclear and mitochondrial markers on the genetic diversity and structure of the Indian white shrimp Fenneropenaeus indicus among the marginal seas in the Indian Ocean
- Author
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K. K. Bineesh, V. S. Basheer, Ajay Mandal, S.D. Gopakumar, George Grinson, K A Sajeela, and A. Gopalakrishnan
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0106 biological sciences ,0301 basic medicine ,Genetic Markers ,Population genetics ,Biology ,010603 evolutionary biology ,01 natural sciences ,Electron Transport Complex IV ,03 medical and health sciences ,Penaeidae ,Species Specificity ,Genetic variation ,Genetics ,Animals ,Molecular Biology ,Indian Ocean ,Ecology, Evolution, Behavior and Systematics ,Phylogeny ,Isolation by distance ,Cell Nucleus ,Genetic diversity ,Base Sequence ,Geography ,fungi ,Genetic Variation ,Bayes Theorem ,Shrimp ,Mitochondria ,Phylogeography ,030104 developmental biology ,Genetics, Population ,Haplotypes ,Evolutionary biology ,Mantel test ,Microsatellite ,Microsatellite Repeats - Abstract
Genetic variation in wild stocks of a major commercial shrimp, Fenneropenaeus indicus, from the marginal seas in the Indian Ocean was analysed using polymorphic microsatellite loci and mitochondrial COI gene. The average observed heterozygosity (Ho = 0.44 ± 0.02) and the expected heterozygosity (He = 0.73 ± 0.01) were high across loci and populations indicating high microsatellite variation. Pairwise FST and Bayesian clustering indicated the occurrence of four genetically distinct stocks out of the eight sampled populations with implications for specific management approaches. Mantel test for isolation by distance proved that genetic differentiation is not related to geographic distance between populations. Mitochondrial COI sequence analysis showed concordant differentiation pattern as well indicated the relevance of COI in population genetics of shrimps. Pairwise ɸST and phylogenetic and Bayesian analyses revealed four distinct clades, as observed with nuclear markers. Divergence time analysis revealed the origin and initial divergence of F. indicus corresponds to late Miocene and divergence to phylogroups in the Pleistocene. BSP analysis presented a long stable population size with a slight decrease in the late Pleistocene and gradually expanded to the current status. The information here will be useful in commercial shrimp breeding and selection programmes and management of natural stocks of Indian white shrimp.
- Published
- 2018
8. Priorities and Strategies to Boost Incomes of Marine Fisher Folk in India
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Parappurathu, Shinoj, George, Grinson, Narayanakumar, R., Aswathy, N., Ramachandran, C., and Gopalakrishnan, A.
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Agricultural and Food Policy - Published
- 2017
- Full Text
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9. Assessment of the coral bleaching during 2005 to decipher the thermal stress in the coral environs of the Andaman Islands using Remote Sensing
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Shailesh Nayak, Srinivasa Kumar Tummula, Hrusikesh Bisoyi, George Grinson, R. S. Mahendra, Bijaya Kumar Sahu, and P. C. Mohanty
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Atmospheric Science ,geography ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,biology ,Coral bleaching ,Applied Mathematics ,Coral ,Porites ,0211 other engineering and technologies ,02 engineering and technology ,biology.organism_classification ,01 natural sciences ,Montipora ,Sea surface temperature ,Oceanography ,Climatology ,Satellite data ,Acropora ,Computers in Earth Sciences ,Reef ,021101 geological & geomatics engineering ,0105 earth and related environmental sciences ,General Environmental Science ,Remote sensing - Abstract
Sea Surface Temperature (SST) derived from the NOAA AVHRR satellite data were used to generate the Degree of Heating Weeks (DHW) and Hot Spot (HS) products. Combination of the cumulative temperature anomalies and the thermal stress studies were yielded to synoptically identify the probable areas of bleaching. The bleaching status of the Andaman region was assessed based on the DHW and HS for the bleaching event occurred in the Andaman region in April/May 2005. The bleaching status up to Alert Level-1 was recorded with the maximum HS of 3 o C and DHW 6 o C-week. Simultaneous in-situ reef observations conducted in the Andaman Sea confirmed the coral bleaching event. The maximum mortality in the region due to coral bleaching was shown by the Acropora species (43%) followed by Montipora species (22%) and Porites species (14%). This study focused on detection of coral bleaching warning based on the SST in compliment with the in-situ observations. Keywords: Andaman Island, Hot Spot, degree of heating weeks, thermal stress, sea surface temperature.
- Published
- 2013
10. Differential bleaching of corals based on El Niño type and intensity in the Andaman Sea, southeast Bay of Bengal
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S. Ramasundaram, Muthiah M Arul, Ramasamy Venkatesan, V K Jineesh, Malayath Aravindakshan Atmanand, G. Vengatesan, J K Lix, R R Rao, R. Sundar, and George Grinson
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0106 biological sciences ,Hot Temperature ,010504 meteorology & atmospheric sciences ,Climate change ,India ,Management, Monitoring, Policy and Law ,01 natural sciences ,Stress, Physiological ,Animals ,0105 earth and related environmental sciences ,General Environmental Science ,El Nino-Southern Oscillation ,geography ,geography.geographical_feature_category ,Coral Reefs ,010604 marine biology & hydrobiology ,General Medicine ,Coral reef ,Anthozoa ,Pollution ,Sea surface temperature ,Indian ocean ,Oceanography ,El Niño ,Bays ,Climatology ,BENGAL ,Walker circulation ,Bay ,Geology ,Environmental Monitoring - Abstract
The Andaman coral reef region experienced mass bleaching events during 1998 and 2010. The purpose of this study is to investigate the role of the El Nino in the coral reef bleaching events of the Andaman region. Both Nino 3.4 and 3 indices were examined to find out the relationship between the mass bleaching events and El Nino, and correlated with sea surface temperature (SST) anomalies in the Andaman Sea. The result shows that abnormal warming and mass bleaching events in the Andaman Sea were seen only during strong El Nino years of 1997–1998 and 2009–2010. The Andaman Sea SST was more elevated and associated with El Nino Modoki (central Pacific El Nino) than conventional El Nino (eastern Pacific El Nino) occurrences. It is suggested that the development of hot spot patterns around the Andaman Islands during May 1998 and April–May 2010 may be attributed to zonal shifts in the Walker circulation driven by El Nino during the corresponding period.
- Published
- 2015
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