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Title: Changes in inter-tidal foraminifera following tsunami inundation of Indian coast
Authors: Gadi, Subhadra Devi
Rajashekha, K.P
Keywords: Tsunami
Indian Ocean
Issue Date: Mar-2007
Publisher: CSIR
Abstract: To ascertain whether severe Indian Ocean tsunami of 26 December 2004 along the coast of India generated a change in diversity of foraminifera, inter-tidal post- tsunami samples were collected between 3rd and 4th January 2005 and compared with shore samples prior to tsunami, collected during an ongoing survey between 11th and 12th December 2004. A total of 24 sediment samples from different sites were analysed for foraminiferal diversity and also for sediment characteristics. Total foraminiferal number, organic matter and calcium carbonate showed considerable increase in post-tsunami samples. Significant changes in diversity were observed as indicated by Shannon Diversity and Morisita-Horn Similarity indices. As many as 41 species belonging to 20 genera, 14 families and 3 sub-orders were identified from pre-tsunami samples, while 71 species belonging to 34 genera, 17 families and 3 sub-orders were recorded from post-tsunami samples. A marked increase in foraminiferal relicts was observed in post-tsunami samples, suggesting a large-scale transportation of deeper water, offshore sediment to intertidal zone. Thus, geological events may cause abrupt changes in foraminiferal abundance and diversity of sediments.
Page(s): 35-42
ISSN: 0379-5136
Source:IJMS Vol.36(1) [March 2007]

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