Distribution and sources of sedimentary organic matter in Chitrapuzha, a tropical tidal river, southwest coast of India

Kumar, Kurunthachalam Senthil; Nair, Swapna S.; Salas, P. M.; Cheriyan, Eldhose

doi:10.1080/15275922.2017.1304468

Cited by 11 publications

(6 citation statements)

References 58 publications

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“…Unfortunately, the lack of similar data from previous study periods in Po River sediments does not allow any inference on temporal changes in the benthic trophic status of the riverine station. Nevertheless, the overall BPC contents in the Po River sediments during our study were in the lowest range observed in other rivers, although in largely different ecological contexts and latitudes [75]. This would suggest that, most likely due to the increased use of inner freshwaters for human usage [76], the sediments of the Po River could also have recently experienced a decrease in the benthic trophic status.…”

Section: Discussioncontrasting

confidence: 50%

Sedimentary Organic Matter, Prokaryotes, and Meiofauna across a River-Lagoon-Sea Gradient

et al. 2020

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In benthic ecosystems, organic matter (OM), prokaryotes, and meiofauna represent a functional bottleneck in the energy transfer towards higher trophic levels and all respond to a variety of natural and anthropogenic disturbances. The relationships between OM and the different components of benthic communities are influenced by multiple environmental variables, which can vary across different habitats. However, analyses of these relationships have mostly been conducted by considering the different habitats separately, even though freshwater, transitional, and marine ecosystems, physically linked to each other, are not worlds apart. Here, we investigated the quantity and nutritional quality of sedimentary OM, along with the prokaryotic and meiofauna abundance, biomass, and biodiversity, in two sampling periods, corresponding to high vs. low freshwater inputs to the sea, along a river-to-sea transect. The highest values of sedimentary organic loads and their nutritional quality, prokaryotic and meiofaunal abundance, and biomass were consistently observed in lagoon systems. Differences in the prokaryotic Operational Taxonomic Units (OTUs) and meiofaunal taxonomic composition, rather than changes in the richness of taxa, were observed among the three habitats and, in each habitat, between sampling periods. Such differences were driven by either physical or trophic variables, though with differences between seasons. Overall, our results indicate that the apparent positive relationship between sedimentary OM, prokaryote and meiofaunal abundance, and biomass across the river-lagoon-sea transect under scrutiny is more the result of a pattern of specifically adapted prokaryotic and meiofaunal communities to different habitats, rather than an actually positive ‘response’ to OM enrichment. We conclude that the synoptic analysis of prokaryotes and meiofauna can provide useful information on the relative effect of organic enrichment and environmental settings across gradients of environmental continuums, including rivers, lagoons, and marine coastal ecosystems.

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Section: Discussioncontrasting

confidence: 50%

Sedimentary Organic Matter, Prokaryotes, and Meiofauna across a River-Lagoon-Sea Gradient

et al. 2020

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“…Coastal sediments receive organic matter from different sources, including autochthonous inputs of phytoplankton primary productivity, and allochthonous inputs such as terrigenous, river runoff, and anthropogenic sources (Graham et al, 2001;Lamb et al, 2006). Since organic carbon and nitrogen stable isotope ratios (δ 13 C and δ 15 N) and C/N elemental ratios of surface sediments from different sources generally have different values, data can be used to identify the organic matter provenance in coastal marine environments (Voβ and Struck, 1997;Ruiz-Fuiz-Fernández et al, 2002;Kubo and Kanda, 2017;Sanil Kumar et al, 2017;Yu and Zhang, 2017). For instance, high δ 15 N values of 10-14‰ may characterize recent river borne particulates (Voβ and Struck, 1997), low δ 13 C values of −27.94 to −26.05‰ may indicate terrestrial inputs from higher plants (Sanil Kumar et al, 2017) and C/N ratios of 15.13-29.69 may signal a combined input of both autochthonous and terrestrial organic matter sources (Sanil Kumar et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

The distribution and seasonal variations of sedimentary organic matter in the East China Sea shelf

Zhou

Gao

Yuan

et al. 2018

Marine Pollution Bulletin

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We sampled the surface sediments of the East China Sea shelf (ECSS) in spring and autumn, 2014, and analyzed the biogenic element concentrations and stable carbon (δC) and nitrogen (δN) isotopic compositions to study the distribution and seasonal variations of sedimentary organic matter (OM). The average concentrations of TOC, TN and OP in autumn decreased obviously compared with those in spring. The increase of δN values in autumn indicated the priority utilization of N by bacterial decomposition activity. The values of δC were used to trace organic matter sources. The estimated percentages for terrestrial OM were in the range of 0-34.6%. They generally decreased seaward in nearshore areas, indicating the decrease of terrigenous influence. There was an obvious tongue-shaped region with relatively low percentages of terrestrial OM (<12%) in the northern part of the ECSS, which may be a reflection of the intrusion pathway of the outer seawater.

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“…TOC/TS ratios give relevant implications on the redox conditions prevailing in the depositional environment (Raisewell et al 1988). Usually, the dissolved SO 4 2is reduced to H 2 S gas, which reacts with iron minerals to form Fe sulphides which causes a qualitative redox status of the environment under deposition (Akhil et al 2013;Kumar et al 2017). TOC/TS ratios (Fig.…”

Section: Characterisation Of Depositional Environmentmentioning

confidence: 99%

“…The enhanced levels of LOM re ected the increased productivity associated with the external inputs of terrigenous materials (Kumar et al 2017). LOM to TOM ratio in the present investigation (Fig.…”

Section: Characterisation Of Depositional Environmentmentioning

confidence: 99%

“…Benny 2009;Kumar et al 2017). Majority of stations (S 5 , S 7 , S 8 , S 9 , S 10 , S 11 and S 15 ) recorded TOC/TS > 5 category and the stations (S 2 , S 3 , S 13 and S 14 ) exhibited TOC/TS = 1.5 -5 category which pointed out that the sediments undergo sulphate reduction below an oxygenated water system(Hedges and Keil 1995;Renjith et al 2011;Gireeshkumar et al 2013).…”

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Composition of sedimentary organic matter in Thrissur Kole wetland, southwest India

Vidya

Rajathy²,

Kumar³

2023

Environ Earth Sci

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Spatio-temporal distribution dynamics of various biochemical components in Thrissur Kole wetland were analysed to assess the quality of organic matter (OM) and trophic status. Thrissur Kole wetland forms the part of the Vembanad wetland system, located in the southwest coast of India. Surface sediment samples were collected from sixteen sites during non-monsoon (February 2019) and monsoon (August 2019) seasons. Concentration of biochemical parameters displayed a trend as follows: total carbohydrates > total protein > tannin & lignin > total lipids. Observed chlorophyll pigment concentration in sediments was as follows: Chl a > Chl b > Chl c (in both seasons). Intermediate values of C/N ratios indicated a mixed origin of OM. Majority of stations exhibited lower values of protein to carbohydrate ratios which revealed the occurrence of aged sedimentary OM. Lower values of lipid to carbohydrate ratio indicated lower nutritional value of the organic content. The lower content of labile OM, low biopolymeric carbon to total organic carbon ratio and low algal contribution to the biopolymeric carbon suggested that a bulk fraction of OM exist as refractory. Trophic state of the wetland system was evaluated as hypertrophic, based on protein and carbohydrate content, biopolymeric carbon and algal contribution to biopolymeric carbon.

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Distribution and sources of sedimentary organic matter in Chitrapuzha, a tropical tidal river, southwest coast of India

Cited by 11 publications

References 58 publications

Sedimentary Organic Matter, Prokaryotes, and Meiofauna across a River-Lagoon-Sea Gradient

Sedimentary Organic Matter, Prokaryotes, and Meiofauna across a River-Lagoon-Sea Gradient

The distribution and seasonal variations of sedimentary organic matter in the East China Sea shelf

Composition of sedimentary organic matter in Thrissur Kole wetland, southwest India

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