Assessment of metal enrichment and bioavailability in mangrove and mudflat sediments of the tropical (Zuari) estuary, west coast of India

Gadkar, Nikita S.; Nayak, G. N.; Nasnodkar, Maheshwar R.

doi:10.1007/s11356-019-05733-7

Cited by 18 publications

(3 citation statements)

References 56 publications

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“…Additionally, the differential source of metals at three stations might be another factor that regulated the metal accumulation in bivalves. For instance, the Zuari Estuary is reported to have received a signi cant concentration of metals through the catchment area operated ferromanganese mining activities (Noronha and Nayak 2016;Gadkar et al 2019). On the contrary, the rest of the two water bodies receive metal input through industrial, agricultural and domestic activities.…”

Section: Metal Bioaccumulationmentioning

confidence: 99%

“…The rivers/estuaries in Goa over the last two decades are exclusively contaminated with metals as a result of extensive mineral ore mining, industrialization and population expansion (Gadkar et al 2019). Metal as a pollutant in rivers/estuaries is often introduced through natural rocks weathering and anthropogenic actions such as mining, industries, agricultural waste and house-hold sewage (Nasnodkar and Nayak 2017).…”

Section: Introductionmentioning

confidence: 99%

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Speciation of Metals and Their Bioaccumulation by Edible Bivalves (Cassosstrea Spp. And Polymesoda Spp.) in the Aquatic Bodies of Goa, West Coast of India

Bhutia

Nasnodkar

Nayak

2021

Preprint

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Grain size, total organic carbon, total metals and their speciation was investigated in sediments from lower Chapora Estuary, middle Zuari Estuary and Moira River in Goa, India. Study aims to understand metal bioavailability and bioaccumulation in two edible bivalves (Cassosstrea spp. and Polymesoda spp.) in three water bodies of different lengths, catchment areas, hydrodynamics and anthropogenic stress. Hydrodynamics regulated coarser sediment transport and deposition at Chapora and Moira stations, while clay particles deposition at the Zuari Estuary. Considerable difference in total metal level (Mn and/or Zn) from November to December was attributed to their additional input and variation in physicochemical processes. Contamination factor revealed moderate contamination of Zn at Chapora (November), while Zn, Cu and Co were moderately contaminated at Zuari. Presence of metals in considerable or significant amount in bioavailable fractions indicated their bioavailability. Variation in metal accumulation in gills, adductor muscle and digestive gland at three stations and between months was the result of varying hydrodynamics, trophic levels, feeding habits and pollution gradients of metal causes. Interlinkage of metals in water, sediments and bivalves revealed discrepancies in accumulation of metal type. This might be attributed to differential response of species to varying physical and biological factors at study sites. Bivalves showed a selective preference for Zn at three stations highlighting its importance in biological activities. Moreover, metals in bivalves at one or more stations exceeded the standard permissible limit and thus, indicated their toxicity to bivalves and non-suitability for human consumption according to marine pollution index.

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Section: Metal Bioaccumulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Speciation of Metals and Their Bioaccumulation by Edible Bivalves (Cassosstrea Spp. And Polymesoda Spp.) in the Aquatic Bodies of Goa, West Coast of India

Bhutia

Nasnodkar

Nayak

2021

Preprint

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“…Consequently, coastal lagoons are highly exposed to various types of contaminants including trace metals, hydrocarbons, and plastics, which result from sources that include, but are not limited to, increased discharge of domestic, municipal, and industrial effluents (Pedro et al, 2016;Sogbanmu et al, 2016;Veiga et al, 2019;Wakkaf et al, 2020;El Zrelli et al, 2021). These contaminants persist for long periods and become bioavailable to living organisms because of their potential to bioaccumulate and biomagnify through the food chain (Bryan and Langston, 1992;Zhou et al, 2008;Bakshi et al, 2018), where sediments serve as their ultimate sink (Gadkar et al, 2019;Jung et al, 2019). Given that such lagoons are only occasionally connected with the open sea, marine influence is limited, and the sedimentary record is relatively continuous and undisturbed.…”

Section: Introductionmentioning

confidence: 99%

Sedimentary History of Trace Metals Over the Past Half-Century in Songkhla Lake, Western Coast of the Gulf of Thailand: Anthropogenic Impacts and Contamination Assessment

Dong

Qiao

et al. 2021

Front. Earth Sci.

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Coastal lagoons are among the most vulnerable and economically significant ecosystems on Earth. Songkhla Lake, connected with the Gulf of Thailand, is the second largest lake in Southeast Asia and supports the development of the fishery, transportation, and tourism industries in southern Thailand. With increasing anthropogenic disturbances, the lake is facing acute ecological problems and further research is needed. Here, we provide 55-year record of grain size, color reflectance, magnetic susceptibility, total organic carbon, total nitrogen, and trace element (As, Hg, Pb, Cr, Ni, Cu, and Zn) concentrations of sediment core SKL8-2 collected from Songkhla Lake. These records reveal a three-stage sedimentary and input history of trace metals under anthropogenic effects: 1) From 1964 to 1982, it was a natural terrigenous input period with a relative reduction environment when the channel connecting Songkhla Lake and the Gulf of Thailand was closed. 2) Trace metal concentrations, organic carbon content, b* value, and magnetic susceptibility changed abruptly in 1982. During 1982–2000, the sources of trace metals were more complex than during 1964–1982 and mainly came from urban wastewater, industrial effluent, and fishery discharge. 3) From 2000 to 2019, contamination signals of Pb, Hg, As, Zn, and Ni emerged in the first decade because of the rapid development and poor sewage treatment around nearby cities.

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Source, Processes, and Depositional Environments of Estuarine Mudflat Core Sediments, Central Western Coast of India

Nayak

Singh

2022

Geochemical Treasures and Petrogenetic Processes

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Assessment of metal enrichment and bioavailability in mangrove and mudflat sediments of the tropical (Zuari) estuary, west coast of India

Cited by 18 publications

References 56 publications

Speciation of Metals and Their Bioaccumulation by Edible Bivalves (Cassosstrea Spp. And Polymesoda Spp.) in the Aquatic Bodies of Goa, West Coast of India

Speciation of Metals and Their Bioaccumulation by Edible Bivalves (Cassosstrea Spp. And Polymesoda Spp.) in the Aquatic Bodies of Goa, West Coast of India

Sedimentary History of Trace Metals Over the Past Half-Century in Songkhla Lake, Western Coast of the Gulf of Thailand: Anthropogenic Impacts and Contamination Assessment

Source, Processes, and Depositional Environments of Estuarine Mudflat Core Sediments, Central Western Coast of India

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