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Govil, P.
- Environmental Implication on Chamber Accretion of Neogloboquadrina pachyderma (Ehrenberg) in Southern Indian Ocean
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Authors
Affiliations
1 National Centre for Antarctic and Ocean Research (Ministry of Earth Sciences), Headland Sada, Goa - 403 804, IN
2 Department of Geology, Banaras Hindu University, Varanasi - 221 005, IN
1 National Centre for Antarctic and Ocean Research (Ministry of Earth Sciences), Headland Sada, Goa - 403 804, IN
2 Department of Geology, Banaras Hindu University, Varanasi - 221 005, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No 3 (2009), Pagination: 379-385Abstract
Morphological variations with respect to the number of chambers in Neogloboquadrina pachyderma (Ehrenberg) were investigated in 25 surficial sediments of Indian Ocean taken along the N-S transect between 9.69° N and 55.01° S latitude and 80° E and 40° E longitude. The number of chamber was counted for at least 40 specimens picked for each sample. The average number of chamber was correlated with the average temperature and salinity along the changing latitude. The results showed a high correlation between the number of chambers and temperature and salinity. It was noted that number of chambers decreases from equatorial to polar region. The carbonate saturation and nutrient availability could possibly be other causes for the change in number of chambers. The results of this study, if applied on the subsurface marine sediments, will bear implications on paleoclimatic condition in the Indian Ocean region.Keywords
Neogloboquadrina pachyderma, Number of Chambers, Temperature and Salinity, Equatorial to Polar Region, Indian Ocean.
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- Statistical Approach to Correlate the Morphological Variations in Foraminifera Neogloboquadrina pachyderma with the Hydrological Parameters in Surface Sediments Along NS Transect in SW Indian Ocean
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Authors
Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow-226007, IN
2 Ministry of Earth Sciences, Mahasagar Bhawan, Block #12, CGO Complex, Lodhi Road, New Delhi-110003, IN
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow-226007, IN
2 Ministry of Earth Sciences, Mahasagar Bhawan, Block #12, CGO Complex, Lodhi Road, New Delhi-110003, IN
Source
International Journal of Earth Sciences and Engineering, Vol 9, No 3 (2016), Pagination: 951-957Abstract
A total of 23 surface sediment samples collected from north-south stretch along the Indian Ocean have been examined for their planktonic foraminiferal faunas. Among the other planktonic foraminiferal faunas, Neogloboquadrina pachyderma was found substantially in all samples. Census data of N. pachyderma were obtained for different parameters (average size, mean proloculus size, coiling direction and number of chamber) and were analyzed using a Q-mode cluster analysis. Samples were segregated into three clusters, each reflecting particular environmental conditions. These clusters are: (1) Cluster A comprised of 14 samples from tropical to sub-tropical zone, characterized by a moderate range of foraminiferal and ecological parameters; (2) Cluster B comprised of 8 samples mainly from sub-polar zone, characterized by lowest range of foraminiferal parameters with lowest range of sea surface temperature and salinity; (3) Cluster C comprised of a single sample (northernmost sample from our study area) from tropical zone, characterizing higher range of foraminiferal parameters along with highest value of sea surface temperature and lowest value of nutrient and dissolved oxygen. The study suggests that sea surface temperature, sea surface salinity and nutrients are the main ecological factors controlling the morphological characteristics of planktonic foraminiferal species N. pachyderma.Keywords
South Western Indian Ocean, Planktonic Foraminifera, Neogloboquadrina pachyderma, Morphological Characters, Q-Mode Cluster Analysis, Ecological Factors.Full Text