Papers by Pallavi Choudhari
Palaeogeography, Palaeoclimatology, Palaeoecology, 2021
Palaeogeography, Palaeoclimatology, Palaeoecology
Micropaleontology
The families Calciosoleniaceae, Syracosphaeraceae and Rhabdosphaeraceae belong to the order Syrac... more The families Calciosoleniaceae, Syracosphaeraceae and Rhabdosphaeraceae belong to the order Syracosphaerales and constitute a significant component of extant coccolithophore species, sharing similar ultrastructural bauplans. The literature on Calciosoleniaceae is reviewed and combined light- and scanning electron microscope studies of four extant species including Calciosolenia subtropicus sp. nov. described herein, reveal the unique interpretative V/R structure of the Calciosoleniaceae. Calciosolenia subtropicus sp. nov. is primarily distinguished from previously well documented extant species, Calciosolenia murrayi, Calciosolenia brasiliensis and Calciosolenia corsellii, by the consistent presence of prominent clockwise imbricated wedge shaped R-elements at the inner margin and in distal view of both ordinary and apical scapholiths, distinctly tapering in size towards the major axis of the scapholiths, as observed under the scanning electron microscope. Prompted by the contrasting...
Coccolithophores are one of the major groups of marine carbonate producers and are the most impor... more Coccolithophores are one of the major groups of marine carbonate producers and are the most important pelagic unicellular calcifying organisms which play a pivotal role in the marine biogeochemical cycles. Since past few decades, coccolithophores have gained attention due to their unique role in the global carbon cycle and particularly due to their combined effects on the biological carbon and carbonate counter pumps. Owing to their high diversity, better preservation, fast turnover rate and significant role in the marine biogeochemical cycles, coccolithophores are identified as a potential proxy to reconstruct palaeoceanographic changes. In this review, a broad introduction of the biology and biogeography of extant coccolithophores is discussed with a brief overview on the preservation of the coccoliths and their applications. This includes how coccolith abundance, diversity and morphometric studies are used to reconstruct palaeotemperature, palaeosalinity, palaeoproductivity and p...
Current Science, 2020
Coccolithophores are one of the major groups of marine carbonate producers and are the most impor... more Coccolithophores are one of the major groups of marine carbonate producers and are the most important pelagic unicellular calcifying organisms which play a pivotal role in the marine biogeochemical cycles. Since past few decades, coccolithophores have gained attention due to their unique role in the global carbon cycle and particularly due to their combined effects on the biological carbon and carbonate counter pumps. Owing to their high diversity, better preservation, fast turnover rate and significant role in the marine biogeochemical cycles, coccolithophores are identified as a potential proxy to reconstruct palaeoceanographic changes. In this review, a broad introduction of the biology and biogeography of extant coccolithophores is discussed with a brief overview on the preservation of the coccoliths and their applications. This includes how coccolith abundance, diversity and morphometric studies are used to reconstruct palaeotemperature, palaeosalinity, palaeoproductivity and palaeocirculation. In addition, implications of coccolithophores in the isotopic studies for the estimation of palaeotemperature and palaeoproductivity are also discussed.
Deep Sea Research Part II: Topical Studies in Oceanography
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Papers by Pallavi Choudhari