Ecological indications of copepods to oxygen-deficient near-shore waters

Jyothibabu, R.; Jagadeesan, L.; Karnan, C.; Arunpandi, N.; Pandiyarajan, R.S.; Balachandran, K.K.

doi:10.1016/j.ecolind.2018.04.069

Cited by 19 publications

(5 citation statements)

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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%

“…Mudbank is a unique coastal oceanographic feature that occurs in certain regions along the SEAS and are unusually calm areas of the coastal sea during rough monsoons. 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).…”

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%

“…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). They appear during the monsoon and can be found up to around 5 kilometers from the shore in water that is 5 to 10 meters deep and 4 km from the shore (Balachandran et al, 2004).…”

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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