Inter-annual variations in the hydrochemistry of Alappuzha mud banks, southwest coast of India

Mathew, Dayana; Gireeshkumar, T.R.; Udayakrishnan, P B; Muraleedharan, K. R.; Madhu, N.V.; Nair, M.; Revichandran, C.; Balachandran, K.K.

doi:10.1016/j.csr.2019.03.008

Cited by 13 publications

(5 citation statements)

References 29 publications

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“…Rich pelagic sheries along the southwest coast of India are assumed to be mainly caused by upwelling during the southwest monsoon season (Jyothibabu et al, 2018;Dayana et al, 2019;Gireeshkumar et al, 2017;Balachandran et al, 2004). The nutrient enrichment during upwelling promotes phytoplankton growth (Karnan et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…Historically, Mudbanks have been described as patches of calm, highly turbid waters due to suspended sediments within the 10 m isobaths (Jyothibabu et al, 2018). The most noticeable feature of mudbanks is the suspended loose mud made of ne clay above the unconsolidated silt just above the ocean oor (Dayana et al, 2019). The energy of the incident waves is lost due to this suspended uid muddy layer, causing wave damping in the Mudbanks (Jyothibabu et al, 2018;Dayana et al, 2019;Gireeshkumar et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…The most noticeable feature of mudbanks is the suspended loose mud made of ne clay above the unconsolidated silt just above the ocean oor (Dayana et al, 2019). The energy of the incident waves is lost due to this suspended uid muddy layer, causing wave damping in the Mudbanks (Jyothibabu et al, 2018;Dayana et al, 2019;Gireeshkumar et al, 2017). The Mudbanks water column is not turbid and thus supports an extraordinarily high phytoplankton production (Jyothibabu et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…This area is unique because it experiences coastal upwelling at the same time as the southwest monsoon season, which starts in June and delivers cool, hypoxic, nutrientrich subsurface waters to the surface. From June through September, this leads to an increase in phytoplankton biomass, which causes a lot of diatom blooms and high levels of chlorophyll a. Mudbanks of Alappuzha are tantamount to rich sheries, probably due to the enrichment of nutrients during upwelling (Jyothibabu et al, 2018;Dayana et al, 2019;Gireeshkumar et al, 2017;Balachandran et al, 2004). This study forms a part of Alappuzha Mudbank process studies (AMPS, 2014) organized by CSIR National Institute of Oceanography, India.…”

Section: Introductionmentioning

confidence: 99%

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Microbial distribution in Mudbank regions off Alappuzha, South-west coast of India

Vijayan,

Ammini,

Sri

et al. 2024

Preprint

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The coastal waters of Kerala, in the South Eastern Arabian Sea (SEAS), are unique during the Southwest monsoon season due to the concurrent occurrence of two physical processes, the upwelling and Mudbanks. However, little is known about the viral ecology and activity in a system where upwelling and mudbanks coexist, though it is generally recognized that microbial assemblages play a vital role in the food web dynamics of marine systems, particularly in upwelling. Water samples were taken from three locations, M1, M2, and M3, off Alappuzha, on the southwest coast of India to examine the viral activity and distribution. An 18-week study in 2014 and a 16-week study in 2016 on a weekly/biweekly interval were carried out from April to September, which were categorized into three seasons April to May, as pre-monsoon, June to August as monsoon, and September period as late-monsoon. The dissolved oxygen levels showed the incursion of hypoxic waters in all the stations during the peak upwelling period. Upwelling signals were prominent in all the stations, but Mudbank and upwelling co-occurred at M2 alone during monsoon. The abundance of viruses ranged from 0.86 to 15.68×106 Viral like Particles (VLPs mL-1) and prokaryotic abundance ranged from 2.73-16.26×105 cells mL-1. Viral and prokaryotic abundance was significantly higher in the monsoon compared to pre and late-monsoon. Based on Transmission electron microscopy (TEM) results, the non-tailed viruses constituted the major (43%) proportion of the total viruses during this study region. However, the viral production rates and viral-mediated bacterial mortality were high in the pre-monsoon compared to the monsoon and late-monsoon periods. There was no obvious effect of Mudbanks on viral dynamics and the observed variations in virological and hydrological features were governed mainly by coastal upwelling.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microbial distribution in Mudbank regions off Alappuzha, South-west coast of India

Vijayan,

Ammini,

Sri

et al. 2024

Preprint

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“…The hydro-chemical properties of the near shore waters of Alappuzha based on two time-series measurements taken during 2014 and 2016 showed a marked increase in the nitrate levels during 2014, resulting in a massive diatom bloom [64]. The seasonal distribution of foraminifera in response to physicochemical changes associated with the mudbank formation showed that food availability and its source are not a significant factor affecting its distribution in the mudbank.…”

Section: Biogeochemical Processes In Mudbanksmentioning

confidence: 98%

Characteristics of Mudbanks along the Southwest Coast of India

2021

EESRR

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Mudbank is a unique phenomenon observed along the south-west coast of India among all the Indian coastal regions during the Southwest Monsoon Season. The scientific reasons behind the formation and its persistence are vague. Mudbank is considered as a boon to the fishermen of Kerala, as they are getting reasonable catches during the occurrence of mudbanks using indigenous boats from the calm sea, which otherwise is in a fury during the rough Southwest Monsoon Season. Since the region, the Arabian Sea, is significant as a carbon sink due to its very high productivity because of different coastal ocean features, variations in the smaller and highly restricted coastal processes due to climate change can have a significant impact on the rates of global warming. Here, we consolidate the previous publications on various aspects of mudbanks with the reports of the occurrence of mudbanks on the south-west coast of India. A model for the prediction of the formation and location of mudbanks, inclusive of all the intrinsic and extrinsic parameters involved, through an extensive study is much relevant as far as the socio-economic and food security significance is concerned. Here, we discuss the most conducive factors for the formation of mudbank and its characteristics with special reference to Alappuzha, where the frequency of occurrence of mudbanks is maximum among the Indian coastal regions.

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Microbial distribution in Mudbank regions off Alappuzha, South-West coast of India

Vijayan,

Ammini,

Pradeep Ram

et al. 2024

Environ Monit Assess

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Inter-annual variations in the hydrochemistry of Alappuzha mud banks, southwest coast of India

Cited by 13 publications

References 29 publications

Microbial distribution in Mudbank regions off Alappuzha, South-west coast of India

Microbial distribution in Mudbank regions off Alappuzha, South-west coast of India

Characteristics of Mudbanks along the Southwest Coast of India

Microbial distribution in Mudbank regions off Alappuzha, South-West coast of India

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