Indian monsoon variability in the last 2000 years as inferred from benthic foraminifera

Suokhrie, Thejasino; Saalim, Syed Mohammad; Saraswat, Rajeev; Nigam, R.

doi:10.1016/j.quaint.2017.05.037

Cited by 22 publications

(9 citation statements)

References 59 publications

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“…The organic matter and dissolved oxygen are two major factors that affect benthic foraminifera in diverse settings from tropics to poles (Jorissen et al, 1995;Shetye et al, 2011;Suokhrie et al, 2017). The relative abundance of A. trispinosa is inversely related to %C org .…”

Section: Relationship With Organic Mattermentioning

confidence: 99%

Abundance and Ecology of EndemicAsterorotalia trispinosafrom the Western Bay of Bengal: Implications for its Application as a Paleomonsoon Proxy

Saraswat

Manasa

Suokhrie

et al. 2017

Acta Geologica Sinica (Eng)

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A total of 97 surface sediment samples were collected from the continental shelf and slope of the western Bay of Bengal to assess the potential application of Asterorotalia trispinosa as a paleomonsoon proxy. The relative abundance of living as well as total (living and dead) A. trispinosa ranges from being absent to a maximum of ∼31%. The highest abundance of A. trispinosa is close to the outfall region of the Ganga‐Brahmaputra Rivers and decreases away from the river mouths. Contrary to that, A. trispinosa is rare in front of both the Cauvery and Pennar river outfall regions, in the central part of the western Bay of Bengal. The living A. trispinosa abundance is the lowest in between two major river systems, viz. Ganga‐Brahmaputra‐Mahanadi and Krishna‐Godavari. The relative abundance of both the total and living A. trispinosa is strongly positively correlated with ambient seawater temperature, and negatively correlated with %Corg and salinity. Based on the spatial distribution, we conclude that A. trispinosa is stenohaline in nature, rather than euryhaline, and further that the increased relative abundance of A. trispinosa indicates warmer and only marginally hyposaline environment. Even though the ecological preference of A. trispinosa suggests it as a potential paleomonsoon proxy, the restricted distribution implies limited application.

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Section: Relationship With Organic Mattermentioning

confidence: 99%

Abundance and Ecology of EndemicAsterorotalia trispinosafrom the Western Bay of Bengal: Implications for its Application as a Paleomonsoon Proxy

Saraswat

Manasa

Suokhrie

et al. 2017

Acta Geologica Sinica (Eng)

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“…Thus, this group is used as a vital proxy for paleoclimatic reconstruction. Several studies have been conducted using foraminiferal census count around the globe to understand paleoclimatic variations (Kaiho, 1991; Manasa et al, 2016; Nigam et al, 1992; Severin, 1983; Suokhrie et al, 2018). Temporal variation in the abundance and morphology of foraminiferal tests is an evolutionary adaptation due to environmental change.…”

Section: Introductionmentioning

confidence: 99%

“…Several researchers prefer foraminiferal morpho-groups for paleoclimatic study over species-level identification due to the chances of errors during species-level identification and restricted geological range of benthic foraminiferal species across the large geological time scale (Manasa et al, 2016; Nigam et al, 1992). Researchers have grouped benthic foraminifera in terms of Angular Asymmetric Benthic Foraminifera (AABF) and Rounded Symmetric Benthic Foraminifera (RSBF) from the riverine influx-dominated regions and suggest these groups have potential for paleomonsoonal reconstruction (Manasa et al, 2016; Nigam et al, 1992; Suokhrie et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…The higher sedimentation rate provides an opportunity to reconstruct high-resolution (sub-centennial to multi-decadal timescales) paleomonsoonal and climatic history. Several studies have been performed using benthic foraminiferal assemblages from this basin to understand paleoclimate and paleomonsoonal history (Ma et al, 2019; Manasa et al, 2016; Saalim et al, 2019; Suokhrie et al, 2018; Verma et al, 2021). Foraminiferal research of Manasa et al (2016) elaborately described the habitat and ecological preferences of RSBF and AABF from the north-western BoB.…”

Section: Introductionmentioning

confidence: 99%

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Late-Holocene paleoceanographic and climatic changes and their impact on Indian socio-economic conditions: Benthic foraminiferal evidence from the Bay of Bengal

et al. 2023

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The present work is pursued on the benthic foraminiferal groups obtained from NGHP core samples of the western Bay of Bengal to understand the variations of paleoceanography and Indian Summer Monsoon (ISM), as well as socio-economic changes in ancient India. Benthic foraminiferal AMS 14C dating reveals that the studied interval spans between 335 BC and 1355 AD, covering the history of the last 1690 years. We compared foraminifera group counts with published isotopes, sunspot number, summer monsoon index, hematite-stained grain, Al/Ca, 14C data sets. Angular Asymmetrical Benthic Foraminifera, infaunal, and dysoxic groups exhibit declining trends with warm, humid intervals with intensified ISM signature from 335 BC to 406 AD (Roman Warm Period) and from 787 to 1202 AD (Medieval Warm Period). The Increasing trend of the above foraminiferal groups captures the signature of weak ISM from 406 to 787 AD (Dark Age Cold Period) and from 1202 to 1355 AD (Medieval Warm Period and Little Ice Age Transition). Whereas rounded symmetrical benthic foraminifera, epifaunal, and oxic groups show a reverse relation with the abovementioned groups. Spectral analysis of foraminiferal groups shows significant periodicities of 563/561, 450, 321, 281/250, 22/27, and 17/16/15 years, corresponding to various solar cycles. This research uncovers the relationship between solar activity and monsoonal changes, which influenced India’s economic growth and played a crucial role in the establishment and demise of successive dynasties throughout the Indian subcontinent during the late-Holocene.

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“…Contemporary studies (Faiz et al ., 2017, 2018) have focused on foraminiferal distribution, and little attention has been given to how this distribution can be applied to environmental monitoring. Furthermore, multiple studies have applied foraminifera as proxies for assessing the environmental status of coastal habitats (Murray, 2000; Buosi et al ., 2010; Sreenivasulu et al ., 2019); similar studies relying on ostracods as proxies are much rarer (Suokhrie et al ., 2017). The distribution of benthos is influenced strongly by a suite of abiotic factors including sediment size, sediment organic content, sediment nutrient content, water quality, current velocity and water depth (Koukousioura et al ., 2011; Magno et al ., 2012; Dutertre et al ., 2013).…”

Section: Introductionmentioning

confidence: 99%

Species composition and habitat preferences of benthic ostracod and foraminifera in seagrass and non-seagrass systems within a tropical estuary

et al. 2020

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Ostracods and foraminifera are excellent indicators of environmental change and can act as proxies for the presence of seagrass meadows. These proxies have been under-utilized in vulnerable coastal ecosystems in South-east Asia, and the fundamental habitat and environmental parameters required for such application in environmental monitoring have not yet been established. We investigated the habitat preferences of ostracods and foraminiferal species in seagrass and non-seagrass habitats within Sungai Pulai Estuary (Johor, Malaysia), a system currently undergoing major coastal changes. Samples consisted of surficial and downcore sediments collected from two seagrass meadows and a non-seagrass habitat. Multivariate analysis determined the variations in spatial and depth distribution of the meiofauna. Species dominance, abundance and distribution varied between sites, whereas diversity and community structure varied with sediment depth. We found fewer ostracod individuals (N = 1133) than foraminifera (N = 7242). Ostracods were more species-diverse (H′ = 3.34) in the non-vegetated area compared with seagrass areas (H′ = 2.74), whereas foraminifera species were most diverse (H′ = 3.60) in seagrass areas. Opportunistic species, such as Loxoconcha lilljeborgii, Asterorotalia pulchella, Murrayinella globosa, Ammonia tepida and Elphidium neosimplex dominated the meiofaunal assemblages. The presence of Nummulitidae and Paracyprididae in downcore samples provided information related to rare species and families. Salinity, organic matter and percentage of sand explained much of the meiofaunal distribution. Our findings provide new insight into the factors influencing the presence and distribution of ostracods and foraminifera in the estuary, comprising baseline information for understanding the vulnerability of such habitats to anthropogenic changes.

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Indian monsoon variability in the last 2000 years as inferred from benthic foraminifera

Cited by 22 publications

References 59 publications

Abundance and Ecology of EndemicAsterorotalia trispinosafrom the Western Bay of Bengal: Implications for its Application as a Paleomonsoon Proxy

Abundance and Ecology of EndemicAsterorotalia trispinosafrom the Western Bay of Bengal: Implications for its Application as a Paleomonsoon Proxy

Late-Holocene paleoceanographic and climatic changes and their impact on Indian socio-economic conditions: Benthic foraminiferal evidence from the Bay of Bengal

Species composition and habitat preferences of benthic ostracod and foraminifera in seagrass and non-seagrass systems within a tropical estuary

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