Late quaternary evolution of Ashtamudi–Sasthamkotta lake systems of Kerala, south west India

Nair, K. M.; Padmalal, D.; Kumaran, K.; Sreeja, R.; Limaye, Ruta B.; Srinivas, Reji

doi:10.1016/j.jseaes.2009.09.004

Cited by 57 publications

(28 citation statements)

References 7 publications

(8 reference statements)

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“…The associated evergreen and deciduous elements like Mesua, Elaeocarpus, Garcinia, Schima, Dillenia, Albizia, and Sapotaceae also exhibit 30 to 42% totals indicative of the heavy rainfall in the region. The presence of evergreen taxa, along with Piperaceae and Euphorbiaceae, suggests heavy rainfall in the region (Nair et al, 2010), which is reflected by the observed palynoassemblage in the sediments from both inside and outside of the cave. The occurrence of Dendrophthoe (epiphytic plants) pollen in the palynoassemblage is significant and reflects the existence of a primary forest that receives heavy rainfall in the region.…”

Section: Relationship Of Palynoassemblage Vegetation and Climatementioning

confidence: 99%

Modern Pollen Record on Bat Guano Deposit from Siju Cave and its Implication to Palaeoecological Study in South Garo Hills of Meghalaya, India

Basumatary¹,

Bera²

2014

JCKS

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Meghalaya is well known for its rich tropical biodiversity and numerous natural caves. The Siju Cave of Meghalaya, also known as cave of the bat, is among the longest caves on the Indian subcontinent. The palynological study of fifty bat-guano samples from Siju Cave and of thirty surface soil and moss cushion from the area immediate surrounding the cave reflects the close similarity between the modern pollen and vegetation in the region in the two areas sampled. The resulting palynodata comprise mainly the native flora, dominated by riparian taxa like Duabanga, Syzygium, Careya, and Ficus, along with evergreen and deciduous elements in the region. The evergreen taxa Mesua, Elaeocarpus, and Garcinia, along with Impatiens, reflect the high precipitation in the region. The climate of the region and the vegetation are strongly influenced by the Simsang River, and the heavy rainfall results in the dominance of riparian taxa and other high-rainfall indicator taxa. The occurrence of pollen from Nepenthes khasiana, an endemic and endangered plant of Meghalaya, in bat guano is significant and may be due to its insectivorous and entomophilous nature. However, medicinal plants like Swertia chirata, Cinchona, and Rauvolfia are not encountered in the bat-guano sediments, despite their luxuriant growth around the cave, and these species could be avoided by the insects due to their alkaloid contain and bitter taste. The presence of highland taxa such as Pinus, Abies, Picea, and Larix in the bat guano deposit is significant and suggestive of high winds from higher altitudes, or the pollen may be introduced by the return of migratory Siberian birds during winter to the nearby Siju wildlife and bird sanctuary. The recovery of cerealia along with Areca catechu and Citrus pollen indicate the human activity in the region. The abundance of fungal remains, namely Meliola, Glomus, and Microthyriaceae along with degraded palynomorphs are suggestive of strong microbial activity under warm and humid conditions during sedimentation in the region. The main objective of this study is to identify the potential of bat guano for palaeoecological research and as supportive data for surface and sedimentary soil profiles in the South Garo Hills of Meghalaya. The palynodata from the bat guano of the Siju Cave provides a useful source for palaeoecological information for the South Garo Hills, where intensive natural and human-caused forest fires, heavy rainfall, and soil erosion occur every year and there is a relative scarcity of the lake, wetland, and swamp habitats that normally preserve pollen.

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Section: Relationship Of Palynoassemblage Vegetation and Climatementioning

confidence: 99%

Modern Pollen Record on Bat Guano Deposit from Siju Cave and its Implication to Palaeoecological Study in South Garo Hills of Meghalaya, India

Basumatary¹,

Bera²

2014

JCKS

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“…Twenty three micro-texture features were identified ( Figure 3) and classified into morphological (6), mechanical (11) and chemical (9) features. The frequency distribution of these micro-texture features of the selected quartz grains were categorised into four components namely abundance (70%), common (40-70%), rare (15-40%) and sparse (< 15%) respectively ( Table 2).…”

Section: Micro-textural Analyses Of Quartz Grainsmentioning

confidence: 99%

“…Towards the southern part of the ridge-runnel barrier beach system, the coast is manifested with coast perpendicular Ashtamudi estuary, which is unique in configuration located in uplifted block and antecedent in characteristics [9,10]. The laterite cappings and oxbow lakes along the eastern fringes of the estuary indicates the existence of uplifted prograded or rising coastal margin followed by subsiding interiors marked by backwater channels [11].…”

Section: Introductionmentioning

confidence: 99%

“…However, coastal plain sourrounding the Ashtamudi estuary for its evolutionary history is limited. Recently Nair et al [9] and Padmalal et al [10] reported the evolution of Ashtamudi estuary during Holocene based on the subsurface sedimentological, palynological studies. Here we present the result of the depositional and transportation mechanism of the subsurface sediments of the coastal plain using SEM technique based on the analysis of micro-texture of quartz grains with lithological variation in terms of texture.…”

Section: Introductionmentioning

confidence: 99%

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Depositional History of Coastal Plain Sediments, Southern Kerala, South West India

Ti¹,

Tn²,

Nagendra³

2016

J Earth Sci Clim Change

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“…The coastal lands of the Kallada river basin, comprising an inter-lacing network of water bodies and fluvial channels, have evolved through complex interactions of climatic and sea level processes that affected the coast during the Holocene epoch (Nair et al, 2010). In the post-glacial period, the Ashtamudi lagoon was a semi-enclosed drowned channel with about 12 branches (arms).…”

Section: Holocene Evolution Of Kallada Bay Head Delta (Kbhd)mentioning

confidence: 99%

Climate and Sea Level Changes in a Holocene Bay Head Delta, Kerala, Southwest Coast of India

Padmalal

Nair²,

Kumaran

et al. 2013

Climate Change and Island and Coastal Vulnerability

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Late quaternary evolution of Ashtamudi–Sasthamkotta lake systems of Kerala, south west India

Cited by 57 publications

References 7 publications

Modern Pollen Record on Bat Guano Deposit from Siju Cave and its Implication to Palaeoecological Study in South Garo Hills of Meghalaya, India

Modern Pollen Record on Bat Guano Deposit from Siju Cave and its Implication to Palaeoecological Study in South Garo Hills of Meghalaya, India

Depositional History of Coastal Plain Sediments, Southern Kerala, South West India

Climate and Sea Level Changes in a Holocene Bay Head Delta, Kerala, Southwest Coast of India

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