http://nopr.niscpr.res.in/handle/123456789/34816 2026-10-09T08:46:06Z http://nopr.niscpr.res.in/handle/123456789/35018 Title: Mapping and monitoring of land use/land cover changes in Neil Island (South Andaman) using geospatial approaches Authors: Mageswaran, T.; Sachithanandam, V.; Sridhar, R; Thirunavukarasu, E; Ramesh, R. Abstract: Present study examines the dynamics of land use/ land cover changes to Neil Island, South Andaman using Remote Sensing and GIS for a period of 13 years. Geocoded satellite imageries of Landsat TM (2000) and Landsat ETM 8 (2013) were used to identify the changes between 2000 and 2013. Visual interpretation technique was carried out to identify the features from the satellite imagery along with ground truth verifications. Land use categories such as forest area, mangroves, coral reefs, sandy beach, water body and built-up land have been identified and mapped. The present status (2013) of these resources is as follows: forest area 735.17 ha (40.17%), built-up land covers 601.15 ha (32.85%), coral reef covers an area of 441.00 ha (24.10%), mangroves covers 34.03 ha (1.86%) and sandy beach covers 16.15 ha (0.88%). Forest area was the largest component of land use feature which shows a significant change from 2000 to 2013. Aerial extent of coral reef and mangroves was decreased to 9.21 ha and 2.32 ha respectively. Page(s): 1762-1768 2015-11-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/35017 Title: Impact of Thermal Discharge from a Tropical Coastal Power Plant on Physico-chemical Properties with Special Nutrients of Kalpakkam Coastal Area, Southeastern Coast of India Authors: Natesan, Usha; Muthulakshmi, AL; Deepthi, K; Ferrer, Vincent A; Narasimhan, S.V; Venugopalan, V.P Abstract: Madras Atomic Power Station (MAPS) in Kalpakkam, southeast coast of India discharges cooling water from the power plant into coastal environments. Present study focussed on the seasonal variations in the water quality of coastal water bodies caused by the release of warm water from the power station. The finding reveals that the coastal waters are significantly influenced by freshwater input from the nearby backwaters, such as Edaiyur and Sadras. pH displayed alkaline condition in most of the stations except few stations (S3, S4, S7 and S11) and it varied from (6.3 – 8.0) The nutrient concentration in the coastal waters increases significantly throughout the study period but the phytoplankton production is adversely affected which is reflected by relatively low concentrations of chl-a. It shows that Kalpakkam coast is not adversely affected by thermal pollution or eutrophication and influenced by backwaters inflow and contains traits and characteristics pertaining to an unpolluted environment. Page(s): 1750-1761 2015-11-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/35016 Title: Investigation on antibacterial, antifungal and cytotoxic properties of chosen mangroves Authors: Ramasubburayan, R.; Prakash, S.; Iyapparaj, P.; Sumathi, S.; Thaddaeus, B. Jude; Palavesam, A.; Immanuel, G. Abstract: In the present study antibacterial, antifungal and cytotoxic properties of organic solvent extracts of three mangroves viz. Avicennia marina, Acanthus ilicifolius and Excoecaria agallocha were evaluated. Results showed significant variation in bioactivity with respect to mangroves and solvents used for extraction. Antibacterial and antifungal activity of crude extracts revealed that, methanol extracts had wide spectrum antagonistic activity than chloroform and acetone extracts. Antagonistic activity exhibited by methanol extracts were in the following order: E. agallocha > A. marina > A. ilicifolius. Artemia cytotoxicity assay results inferred that, methanol extracts of E. agallocha, A. marina and A. ilicifolius recorded higher toxicity at lower concentration. Phytochemical analysis of crude extracts showed marked variation in its presence. Findings of the present study indicated that, the synergistic effect of active principles within the crude extracts were responsible for promising biological activity. Thus mangroves proved to be a good source of antimicrobial and cytotoxic agent. Page(s): 1769-1777 2015-11-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/35015 Title: Identification and Reappraisal of Epinephelus coioides and Epinephelus tauvina through a DNA Barcoding Approach from the Andaman waters Authors: Sachithanandam, V.; Mohan, P.M.; Muruganandam, N.; Thamizhmani, R.; Baskaran, R. Abstract: Present study consists sequencing of Cytochrome Oxidase I gene (COI) (DNA barcoding) to identify Epinephelus coioides (Hamilton, 1822) and Epinephelus tauvina (Forsskal, 1775)specimens. Using a Kimura two parameter (K2P), Neighbour Joining (NJ) phylogram and species identification found in the Barcoding of Life database (BOLD) revealed that Andaman species of E. coioides and E. tauvina has low genetic divergence indicating that they may in fact belong to the same species despite, earlier conventional taxonomy reporting the existence of E. coioides and E. tauvina in Andaman waters. In addition, COI gene sequences (many from voucher specimens) retrieved from public databases such as NCBI and BOLD for the comparative and real genetic identity was done. The COI gene sequence used for the K2P analysis delineated species studied in Andaman (E. coioides and E. tauvina ) and Indian references (E. tauvina) sequences had intraspecific genetic divergence values of 0.005 and NJ phylogram showed that these two species are one and same in Andaman waters as well as Indian reference sequences. Based on the morphological study of Andaman water species it showed two different species but the internal organelle (pyloric caeca count) study exhibited as a single species, i.e. E.coioides. The present study concluded that DNA barcoding sequence provides the distinct genetic distances among studied Epinephelus species with low level of interspecific genetic distances for E. tauvina and E. coioides. Present study concluded that the Andaman water groupers need reclassification or re-evaluation in future. Page(s): 1778-1786 2015-11-01T00:00:00Z