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Syed Abbas Jafar

Syed Abbas Jafar
National Centre for Polar and Ocean Research Goa India.

M.Sc.(Lucknow); FPTC, Vienna University, Dr.phil.nat (JWG University, Frankfurt am Main, Germany).
Ultrastructural studies of Southern Ocean Coccolithophores and their bearing on Climatic fluctuations.

About

78
Publications
56,333
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475
Citations
Additional affiliations
April 1965 - March 1971
Aligarh Muslim University
Position
  • Lecturer
Description
  • Research and teaching undergraduate and postgraduate students

Publications

Publications (78)
Article
Full-text available
Finite element modeling (FEM) has been used to evaluate microstructure-controlled stability of selected eggshells of Indian dinosaurs. Our study suggests that under static load the eggshell microstructure of Megaloolithus cylindricus displays a low magnitude of tensile stress over most of the spherolith. The magnitude of this tensile stress is lowe...
Article
Full-text available
The results of the palynological study of road sections at Chainpur, Lip and Lipak from Middle Andaman Island are presented. Chainpur section, near to the site, now believed to be covered with vegetation, from which Late Triassic palynomorphs were first reported from this area, yielded rich Late Cretaceous palynomorphs assemblages which included La...
Article
An increase in the atmospheric pCO2 and temperature is expected to reduce ocean CO3²⁻ concentration, make oceans warmer and alter ocean circulation patterns. This will also affect the production and biogeographic distribution of marine calcifying organisms including coccolithophores. The lowering of oceanic CO3²⁻ is expected to interfere with the c...
Conference Paper
Full-text available
The thermal physiology of saurischian dinosaurs is a subject of research interest over the years. Here in this study, we have carried out clumped isotope investigation on well preserved late Cretaceous Sauropod eggshell from India. Our preliminary investigation reveals a ∆47 based temperature of 39 (±2)°C in CDES scale, similar to the Titanosurid e...
Article
Coccolithophore ecology and biogeography in the Southern Indian Ocean was studied during the austral summer of 2009 (SOE09; late austral summer), 2010 (SOE10; mid-austral summer), and 2012 (ISEA12; early austral summer). During the SOE09 and SOE10, surface water samples (55 and 54 water samples, respectively) were collected from two different trans...
Article
ABSTRACT: 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 fou...
Conference Paper
Full-text available
Coccolithophores are one of the most abundant eukaryotic phytoplankton in the oceans predominantly possessing calcite scales. They play a pivotal role in the oceanic biological pump. Increasing levels of atmospheric carbon dioxide would lead to lowering of oceanic pH affecting calcifiers and therefore the calcification ability of coccolithophores i...
Article
s Water samples from nine vertical profiles down to 110 m water depth and 19 samples from the sea-surface were studied for coccolithophore abundance and distribution across oceanic frontal regions of the Indian sector of the Southern Ocean. Sampling was performed along a north-south transect (between 39°S and 65.49°S, ~ 57.3°E) during the 4th India...
Article
Full-text available
New xenospheres and anomalous coccospheres are reported from the plankton samples collected during the austral summer (January–February) of 2010 in the Southern Indian Ocean. A new xenosphere consisting of a Calcidiscus leptoporus coccosphere and a Syracosphaera nodosa exothecal coccolith is documented. Another xenosphere consisting of different mo...
Article
Full-text available
A case of tiling using a single tile of golden trapezium is presented and each of the five pentagonal sectors when seen in isolation, reveals planes of translation suggesting periodicity. It is shown that this tile not only tessellates Euclidean plane, expanding to infinity, but also maintains perfect regular pentagonal outline at each completed ge...
Conference Paper
Sea surface (0-110m) water samples were collected from the Southern Indian Ocean between 39oS and 65oS (along ~48oE and 57.3oE) during the austral summer of 2010 which yielded Petasaria heterolepis. Out of the two known P. heterolepis forms, the scales with brim are observed with a size range (short and long axes length) of 1.68x1.80 μm and 2.17x2....
Conference Paper
New xenospheres are documented under the Scanning electron microscope from the Indian sector sites of the Southern Ocean, namely: associations of different Emiliania huxleyi morphotypes, Emiliania huxleyi and Syracosphera sp., Calcidiscus leptoporus and Syracosphaera nodosa A XCs, Calcidiscus leptoporus and Emiliania huxleyi and fused Calcidiscus l...
Article
Full-text available
Here we propose a new species of genus Trigonium namely Trigonium curvatus from the surface sediments of coastal Antarctica. A comparative study was done between Trigonium curvatus and Trigonium arcticum to find out the differential morphological characters. Trigonium curvatus is differentiated from the earlier described Trigonium arcticum on the b...
Article
Full-text available
Earlier studies have documented the role of diatoms in reducing the diversity and abundance of other silica dependent organisms, such as radiolaria. Here we hypothesize that diatom burst-driven depletion of dissolved silica (DSi) in the Antarctic under sea-ice waters affects other silica-biomineralizing organisms. We found intense diatom-dominated,...
Article
Full-text available
Prymnesium neolepis was collected from surface and sub-surface waters of the Southern Indian Ocean. It is characterized by the presence of broad 0.6μm-1 μm, recurved poreless brim (collar), and small sized numerous pores (0.1-0.2μm size, 180-240 pores) in the bulging central area of hat-shaped siliceous scale. It was observed in the subtropical and...
Article
Full-text available
Sea surface and sub-surface (0-110m) water samples were collected from the Southern Indian Ocean between 39°S and 65°S (along ~48°E and 57.3°E) during the austral summer of 2010 which yielded Petasaria heterolepis. Out of the two known P. heterolepis forms, the scales with brim are observed with a size range (short and long axes length) of 1.68×1.8...
Article
Full-text available
ABSTRACT The eggshell of Nicobar scrubfowl (Megapodius nicobariensis) is described for the first time. Its egg porosity is calculated and discussed with data from several taxa (another megapode, some extant and fossil reptiles including a titanosaur group) in order to compare incubation types with eggshell structure. Eggshell microstructure reflect...
Article
Full-text available
Late Bathonian - Callovian - Oxfordian - Early Kimmeridgian siliciclastic sediments of some prominent sections of Kachchh Mainland: Jumara, Basal Jumara, Ler, Kanthkot, including Kuldhar Member of Jaisalmer Basin, contain discrete succession of Calcareous Nannofossil assemblage encompassing Standard Jurassic Zones: NJ12 Ansulasphaera helvetica, NJ1...
Article
Full-text available
Relatively small magnitude combined with great numbers and high diversity of calcareous walled fossil plankton provide false impression of "massive", "mass" or "catastrophic" extinction at the Cretaceous-Tertiary Boundary, as revealed by detailed and critical evaluation of coccoliths and foraminifera. Each "mass extinction" in the geologic record,...
Article
Full-text available
Employing special preparation techniques, a rich and moderately preserved assemblage of planktonic foraminifera and coccoliths is documented from pelagic limestones of Melange Zone of Manipur ophiolite belt around Ukhrul area in northeastern India. Integrated biostratigraphy of five exotic limestone blocks encompassing a Late Santonian/Early Campan...
Article
Full-text available
Twentyone species of discoasters are documented from the East Coast and Nipple Hill sections of Sawai Bay Formation. Discoaster pentaperforatus is proposed as new and three species are described under open nomenclature. Discoster berggrenii and Discoaster quinqueramus are the most common forms in the assemblage. The calcareous nannofossil assemblag...
Article
Full-text available
We describe a carbonized wood fragment referable to Laurinoxylon Felix 1883 from flyschoid gritty sandstone (Palaeocene-Eocene) of Baratang Island. We also discuss the provenance and depositional environment of vegetal matter.
Article
Full-text available
The discovery of Danian calcareous nannoplankton of combined NP3-NP4: Chiasmolithus danicus/Ellipsolithus macellus zones from apparently unproductive Subathu of Dharampur, offers new scope for high resolution dating; reworked nannofloral elements of Late Maastrichtian (Micula mura Zone of low-mid latitudes) demand the fixing of lower age limit of S...
Article
Full-text available
A lack of detailed facies studies has resulted in a false impression of the Mesozoic depositional setting in Kachchh, western India (previously, Kachchh has been termed ‘Kutch’ or ‘Cutch’). In addition, designation of part of this sequence as Gondawana implies, by tradition, a predominantly non-marine origin. Recently, we examined these Jurassic–Cr...
Article
Full-text available
Why do you ask, when the Abstract is already there in the Text?
Article
Full-text available
The marine Cretaceous rocks of Narmada Valley are synchronous facies equivalents of a single stroke and short lived transgressive event of late Turonian age, which coincided with late Cretaceous spread of epicontinental seas on a global scale.Critical evaluation of age diagnostic Vertebrate-, Invertebrate and Microfossils earlier reported from diff...
Article
Full-text available
A critical re-examination of the original description and figures of the extant calcareous nannoplankton species "Coccosphaera" carteri Wallich 1877 - type species of the genus Helicosphaera KAMPTNER 1954 - and a comparison with recent and fossil material of its corresponding coccospheres, yields strong evidence that the name Helicosphaera KAMPTNER...
Article
Full-text available
A new species of holothurian sclerite, Calcancora kistnai, from the Pleistocene sediments off the coast of Bombay, India, is described and figured.

Questions

Questions (31)
Question
Blooms for an hour or so in the morning with 3 violet colored petals and 6 golden yellow Anthers.

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Projects

Projects (2)
Project
IGCP Project 608 aims at understanding practical questions of Palaeogeography, Stratigraphy based on fossil fauna and flora of different regions of Asia and Western Pacific with emphasis on Cretaceous Climate and Environmental Changes.