Abundance and Ecology of Endemic<i>Asterorotalia trispinosa</i>from the Western Bay of Bengal: Implications for its Application as a Paleomonsoon Proxy

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

doi:10.1111/1755-6724.13463

Cited by 16 publications

(4 citation statements)

References 35 publications

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“…Due to deposition of sediments, the northern BoB has the widest shallow shelf region of the Indian Ocean (extending >185 km), which is three to four times wider off the coast of Bangladesh compared with Myanmar, the eastern coast of India and the global average of 65 km. The BoB also plays a major role in determining the climatic conditions of India and other south-east Asian countries and thus, its ecology is of paramount interest (Saraswat et al ., 2017).…”

Section: Methodsmentioning

confidence: 99%

A bio-physicochemical perspective of the Bay of Bengal

et al. 2020

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Knowledge of bio-physicochemical variables is essential to better understand the functioning of tropical marine ecosystems, which are rich in biodiversity and provide nutrition and livelihoods to billions of people in the developing countries. This study analysed the spatial and temporal variability of phytoplankton and zooplankton with chlorophyll, primary productivity, temperature, salinity, oxygen and nutrients in the Bay of Bengal (BoB), collecting data from the World Ocean, and COPEPOD and Aqua MODIS records. The results indicated a strong gradient in bio-physicochemical conditions of the BoB, from the coast to the open sea. Specifically, the spatial variability in chlorophyll was negatively correlated (R2 = 0.59) with temperature and zooplankton, while a positive correlation (R2 = 0.70) was noted between chlorophyll and silicate, nitrate, phosphate, dissolved oxygen and salinity. All the variables exhibited a strong vertical gradient at depths up to 500 m. Temperature, nutrients, zooplankton and to a lesser extent salinity and rainfall had an influence on the annual abundance of phytoplankton. Over the long term, a significant positive trend in temperature and a significant negative trend in primary productivity were observed in the BoB. The findings of this study will be useful to draw insights on the state of fisheries habitats and the overall environmental conditions of the BoB in response to future climate changes.

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Section: Methodsmentioning

confidence: 99%

A bio-physicochemical perspective of the Bay of Bengal

et al. 2020

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“…Manasa et al (2016) discuss the ecological preferences of two benthic foraminiferal morpho-groups namely rounded symmetrical and angular asymmetrical benthic foraminifera to reconstruct paleomonsoon from continental shelf region of the northwestern BoB. Saraswat et al (2017) studied the abundance and Ecology of Endemic Asterorotalia trispinosa from the Western BoB. The spatial variation of Asterorotalia trispinosa abundance suggested for paleomonsoon reconstructions based on their ecological preferences.…”

Section: Quaternarymentioning

confidence: 99%

Marine Micropalaeontology: An overview on Indian contributions during 2016-2019

Manoj¹,

Singh²,

Verma³

et al. 2020

PINSA

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Marine micropaleontology concerns biostratigraphy for dating and correlation of deep time sequences as well as in palaeoceanography to understand the marine processes of the past. For this, marine micropalaeontology utilizes detailed studies on exclusively marine microbiota such as foraminifers, nannofossils, diatoms, dinoflagellates, and others. This article discusses (in detail) our present state of palaeoceanographic knowledge based on marine micropalaeontology studies in the Indian sector. A detailed literature survey showcases that numerous studies have been carried out in deep time (Jurassic -Neogene) as well as Quaternary sediments utilizing marine microfossils from India. These studies from different geological periods and regions within the Indian territory such as Jurassic (Kutch Basin), Cretaceous and Cretaceous-Paleogene (K-Pg) transition (western, peninsular and northeast India), Palaeogene (northeast and western India), Neogene (Andaman & Nicobar Islands, northeast Indian Ocean), Quaternary (Indian Ocean, Southern Ocean, coastal and estuarine regions of peninsular India) have provided better insights to our previous understandings on various aspects that include biostratigraphy, paleoenvironment, evolution, ocean/land-climate variability, its dynamics and teleconnections.

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“…Benthic foraminifera are the dominant marine biota in the continental margin sediments and are the primary component of the global carbon cycling. The large abundance, combined with the sensitivity to the ambient conditions and long-term preservation in sediments, makes benthic foraminifera a widely used proxy to reconstruct paleoceanographic changes (Saraswat, 2015;Saraswat et al, 2017). The precise knowledge of the influence of ambient environmental parameters on abundance and distribution, is a prerequisite to use benthic foraminiferal characteristics for paleoceanographic and paleoclimatic interpretation (Murray, 2001;Gooday, 2003;Jorissen et al, 2007;Gooday and Jorissen, 2012;Saraswat and Nigam, 2013).…”

Section: Introductionmentioning

confidence: 99%

Multiple Ecological Parameters Affect Living Benthic Foraminifera in the River-Influenced West-Central Bay of Bengal

2021

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The huge riverine influx and associated processes decrease the ambient salinity, stratify the water column, modulate the oxygen-deficient zone, and are also responsible for the recent acidification in the Bay of Bengal. Here, we have studied the effect of these riverine influx-dominated ecological parameters on living benthic foraminifera in the west-central Bay of Bengal. We report that the pH below 7.6 in front of the Krishna river, reduces the diversity and the richness of living benthic foraminifera on the adjacent shelf and the slope. A similar decreased diversity and richness is also observed in front of the Godavari River. We delineate three prominent assemblages, representing different depth zones with associated distinct physico-chemical conditions. The shallow water assemblage (∼27–100 m) is represented by Nonionella labradorica, Hanzawaia nipponica, Brizalina dilatata, Ammonia tepida, and Nonionella limbato-striata. These species are adapted to relatively warmer temperatures and more oxygenated waters. The deepwater assemblage (∼1,940–2,494 m) includes Bulimina cf. delreyensis, Bulimina marginata, Hormosinella guttifera, Cassidulina laevigata, and Gyroidinoides subzelandica and can tolerate a relatively colder temperature. The intermediate-depth assemblage (∼145–1,500 m) dominated by Eubuliminella exilis, Bolivinellina earlandi, Fursenkoina spinosa, Bolivinellina lucidopunctata, Globobulimina globosa, Fursenkoina spinosa, Eubuliminella cassandrae, Uvigerina peregrina, Rotaliatinopsis semiinvoluta, and Cassidulina laevigata, represents oxygen-deficient and organic carbon-rich environment. Besides the pH, temperature, dissolved oxygen and organic matter, we also report a strong influence of bathymetry, coarse fraction (CF) and the type of organic matter on a few living benthic foraminifera. The ecological preferences of 40 such dominant living benthic foraminifera, each representing a specific environment, have also been reported for site-specific proxy. We conclude that although the huge riverine influx affects living benthic foraminifera on the shelf, the dissolved oxygen and organic carbon mostly control benthic foraminiferal distribution in the deeper west-central Bay of Bengal.

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

Cited by 16 publications

References 35 publications

A bio-physicochemical perspective of the Bay of Bengal

A bio-physicochemical perspective of the Bay of Bengal

Marine Micropalaeontology: An overview on Indian contributions during 2016-2019

Multiple Ecological Parameters Affect Living Benthic Foraminifera in the River-Influenced West-Central Bay of Bengal

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