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dc.contributor.authorSijinkumar, A.V
dc.contributor.authorNath, B.N.
dc.contributor.authorVinodkumar, K.B.
dc.date.accessioned2020-12-31
dc.date.accessioned2021-02-09T10:13:14Z
dc.date.available2020-08-31
dc.date.available2021-02-09T10:13:14Z
dc.date.issued2020
dc.identifier.citationProceedings of the Indian National Science Academy, vol.86(2); 2020; 1107-1120
dc.identifier.issn0370-0046
dc.identifier.otherhttps://insa.nic.in/writereaddata/UpLoadedFiles/PINSA/PINSA_2019_Art58.pdf
dc.identifier.urihttps://doi.org/10.16943/ptinsa/2019/49714
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/8429
dc.descriptionIF2019 - No Impact Factor
dc.description.abstractAmong the different microfossils group, pteropods are least studied zooplanktons having delicate aragonitic shells which are very susceptible to dissolution. The present study has been carried out to understand the effect of dissolution, shell structure and the morphological variations of extant pteropods shells preserved in the late Quaternary sediments of the Andaman Sea with the help of scanning electron microscope (SEM). The study has helped to identify fifteen species of pteropods belong to Family of Limacinidae (Limacina inflata, L. bulimoides, L. trochiformis, Creseis chierchiae, C. virgula, Clio cuspidata and C. pyramidata) and Cavoliniidae (Creseis acicula, C. Conica, Diacria quadridentata, D. trispinosa, Clio convexa, Styliola subula, Cavolina gibbosa and Hyalocylis striata). Microscopic dissolution features are observed on all the species belong to both Limacinidae and Cavoliidae family. Specifically, species like H. striata and L. inflata are more prone to dissolution. The magnified SEM images of pteropods preserved in the last glacial maximum (LGM) and Heinrich event 1(H1) are not showing any features of dissolution which indicates better preservation. However, presence of pits, cavities, fractures and crevices on the shell surfaces was observed on the specimens of inter-stadial period B�lling/Aller�d (B/A). These dissolution features of B/A may be due to the increased strength of summer monsoon and resulted in high biological productivity which might have affected the pteropods shells owing to their vulnerability to dissolution. During high productivity, there is high concentration of dissolved inorganic carbon, resulting from high input and remineralisation of organic matter, lowering the pH of seawater which enhance dissolution of shells.
dc.languageen
dc.publisherIndian National Science Academy
dc.relation.ispartofProc Indian Natl Sci Acad
dc.relation.isreferencedbyNON-SCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleScanning Electron Microscopic Studies of Fossil Pteropods from the Andaman Sea: Inferences on Carbonate Dissolution
dc.typeJournal Article
dc.affiliation.authorCentral University of Kerala, Kasaragod, India


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