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Kar, Ratan

Earliest record of slime moulds (Myxomycetes) from the Deccan Intertrappean beds (Maastrichtian), Padwar, India

Dwarfism and Lilliput Effect: A Study on the Glossopteris from the Late Permian and Early Triassic of India

Abstract Views :216 | PDF Views:84

Authors

Reshmi Chatterjee ¹, Amit K. Ghosh ¹, Ratan Kar ¹, G. M. Narasimha Rao ²

Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow 226 007, IN
2 Department of Botany, Andhra University, Visakhapatnam 530 003, IN

Source

Current Science, Vol 107, No 10 (2014), Pagination: 1735-1744

Abstract

The 'Lilliput effect' represents the phenomenon whereby there is a pronounced reduction in the size of biota associated with the aftermath of mass extinction. This fact has been supported by the evidence of dwarfism both in invertebrates and vertebrates recorded after the end-Permian mass extinction event. The extinct genus Glossopteris belonging to seed ferns Glossopteridales is one of the best known fossil taxon that flourished during the Permian and continued its existence till Triassic. In contrast to the Permian, the Triassic was a time when greenhouse conditions with an increased temperature and widespread aridity prevailed as evidenced by the global dataset. The new set of environmental conditions in the Triassic posed a major challenge for the existing Glossopteris lineage, whereby the smaller forms (dwarfs) with reduced leaf surface area continued and sustained. The present study from different late Permian and early Triassic formations of India is aimed at unravelling the changes in morphological traits of seven species of Glossopteris leaves whose existence continued surpassing the Permian-Triassic mass extinction event.

Keywords

Dwarfism, Extinction Event, Glossopteris, Lilliput Effect, Permian–Triassic Boundary.

Full Text

Modern Pollen Rain in Kedarnath:Implications for Past Vegetation and Climate

Late Pleistocene–Holocene Vegetation and Climate Change From the Western and Eastern Himalaya (India): Palynological Perspective

Abstract Views :229 | PDF Views:85

Authors

Ratan Kar ¹, M. Firoze Quamar ¹

Affiliations
1 Birbal Sahni Institute of Palaeosciences, Lucknow 226 007, IN

Source

Current Science, Vol 119, No 2 (2020), Pagination: 195-218

Abstract

A palynological assay of the studies carried out from the Western and the Eastern Himalaya (India) during the Late Pleistocene and Holocene is presented here. The Western Himalaya is affected by both the Indian Summer Monsoon (ISM) and Western Disturbances, whereas the Eastern Himalaya receives precipitation only from the ISM. During the Late Pleistocene (~77 ka), a cold and arid climate supported steppe vegetation in the Western Himalaya. In the Eastern Himalaya, around 66 ka, a cool and dry climate supported the savannah vegetation with few scattered trees of Pinus and Tsuga. A number of warm-moist fluctuations are also perceptible during the Late Pleistocene. The impacts of Last Glacial Maximum, Holocene Climatic Optimum, Medieval Warm Period and Little Ice Age are well discernible in the vegetation in both the regions. Within a broad similarity, the climate change and associated vegetation succession varied from region to region; as the palynological records are characterized by the evidences of prolonged humid phases in the eastern sector, whereas the arid events are better marked in the western part. The similarities and incompatibilities in the climate and vegetation between the Western and Eastern Himalaya during the Late Pleistocene and Holocene are discussed in the present paper.

Keywords

Climate Change, Himalaya, India, Palaeopalynology, Vegetation Dynamics.

Full Text

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