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Title: The study of benthic foraminifera from the Vellar river estuary, Tamil Nadu and their ecological significance
Researcher: Jeevanandam, S
Guide(s): Kumar, V
Keywords: Vellar river
Upload Date: 7-Nov-2012
University: Bharathidasan University
Completed Date: December 2010
Abstract: The present work has been undertaken with a view to inventory the foraminiferal fauna and to evaluate the various environmental factors governing the living population of the Vellar river estuary, Tamil Nadu, South India. Systematic collection of sediment and bottom water samples were made at 23 stations, once in four months, viz., May (2007), September (2007) and January (2008) for the study. In the study area, 63 foraminiferal species belonging to 31 genera, 22 families, 15 super families of 5 suborders were identified and described. The various ecological parameters such as type of substrate, calcium carbonate, organic matter contents and heavy metal concentrations of the sediment and dissolved oxygen, salinity, pH, nutrients (nitrate, silicate and phosphate content) of the bottom water have been evaluated. The maximum living population size is found to be more between stations 3 and 9 in all the three seasonal collections. Seasonally, the living population size is found to be more during summer and is closely followed by post-monsoon. All the 63 benthic foraminiferal species recognized from the Vellar river estuary are found in living condition in all the seasons. Among these 63 species, the following 5 species are abundant Ammonia beccarii, Ammonia tepida, Nonionoides boueanum, Quinqueloculina seminulum and Trochammina inflata. The spatial distribution of heavy metal concentration reveals that they are more concentrated in and around the stations 5 and 16. Deformities in Ammonia beccarii, Elphidium advenum, Helinina perlucida, Nonionoides boueanum and N. grateloupi are attributed to the concentration of the heavy metals in the sediments. The cluster analysis, taking 23 stations as variables, gave rise to different dendrograms for different collections. A comparative study of the foraminiferal assemblage of the present area, with those from Coleroon estuary, Tamil Nadu has also been made. Temporally, the increase in temperature, salinity and dissolved oxygen content of the bottom water.
Pagination: 231p.
Appears in Departments:Department of Geology

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01_title.pdfAttached File889.97 kBAdobe PDFView/Open
02_declaration.pdf162.37 kBAdobe PDFView/Open
03_certificate.pdf168.04 kBAdobe PDFView/Open
04_acknowledgements.pdf110.16 kBAdobe PDFView/Open
05_contents.pdf178.05 kBAdobe PDFView/Open
06_abstract in english.pdf68.96 kBAdobe PDFView/Open
07_abstact in tamil.pdf24.44 kBAdobe PDFView/Open
08_chapter 1.pdf383.09 kBAdobe PDFView/Open
09_chapter 2.pdf427.39 kBAdobe PDFView/Open
10_chapter 3.pdf329.36 kBAdobe PDFView/Open
11_chapter 4.pdf321.07 kBAdobe PDFView/Open
12_chapter 5.pdf148.94 kBAdobe PDFView/Open
13_chapter 6.pdf155.83 kBAdobe PDFView/Open
14_chapter 7.pdf147.74 kBAdobe PDFView/Open
15_references.pdf367.46 kBAdobe PDFView/Open
16_list of tables.pdf99.72 kBAdobe PDFView/Open
17_list of figures.pdf115.92 kBAdobe PDFView/Open
18_plates, figures and tables.pdf7.82 MBAdobe PDFView/Open

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