Anthropogenic influence shapes the distribution of antibiotic resistant bacteria (ARB) in the sediment of Sundarban estuary in India

Bhattacharyya, Anish; Haldar, Anwesha; Bhattacharyya, Maitree; Ghosh, Abhrajyoti

doi:10.1016/j.scitotenv.2018.08.038

Cited by 47 publications

(20 citation statements)

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“…Mangroves being vulnerable to pollutants including heavy metals could hence harbour a high abundance of ARGs ( Imchen & Kumavath, 2020 ). Analysis of samples from Sundarbans has also shown a strong correlation between ARGs and heavy metals ( Bhattacharyya et al, 2019 ). Several studies have explored heavy metal pollution in mangrove ecosystems and the capability of mangroves to retain these hazardous pollutants ( Fernandes & Nayak, 2012 ; Bodin et al, 2013 ; Li et al, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

Metagenomic insights into surface water microbial communities of a South Asian mangrove ecosystem

Ghosh

Saha

Bhadury

2022

PeerJ

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Estuaries are one of the most productive ecosystems and their productivity is maintained by resident microbial communities. Recent alterations driven by climate change have further escalated these stressors leading to the propagation of traits such as antibiotic resistance and heavy metal resistance in microbial communities. Surface water samples from eleven stations along the Thakuran and Matla estuaries of the Sundarbans Biosphere Reserve (SBR) of Sundarbans mangrove located in South Asia were sampled in monsoon (June) 2019 to elucidate resident microbial communities based on Nanopore sequencing. Metagenomic analyses revealed the widespread dominance of Proteobacteria across all the stations along with a high abundance of Firmicutes. Other phyla, including Euryarchaeota, Thaumarchaeota, Actinobacteria, Bacteroidetes and Cyanobacteria showed site-specific trends in abundance. Further taxonomic affiliations showed Gammaproteobacteria and Alphaproteobacteria to be dominant classes with high abundances of Bacilli in SBR_Stn58 and SBR_Stn113. Among the eukaryotic communities, the most abundant classes included Prasinophyceae, Saccharyomycetes and Sardariomycetes. Functional annotation showed metabolic activities such as carbohydrate, amino acid, nitrogen and phosphorus metabolisms to be uniformly distributed across all the studied stations. Pathways such as stress response, sulphur metabolism and motility-associated genes appeared in low abundances in SBR. Functional traits such as antibiotic resistance showed overwhelming dominance of genes involved in multidrug resistance along with widespread resistance towards commonly used antibiotics including Tetracycline, glycopeptide and aminoglycoside. Metal resistance genes including arsenic, nickel and copper were found in comparable abundances across the studied stations. The prevalence of ARG and MRG might indicate presence of pollutants and hint toward deteriorating ecosystem health status of Sundarbans mangrove.

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Section: Discussionmentioning

confidence: 99%

Metagenomic insights into surface water microbial communities of a South Asian mangrove ecosystem

Ghosh

Saha

Bhadury

2022

PeerJ

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“…Still, tourism is one of the main factors identified as responsible for the degradation of mangrove ecosystems [ 70 ]. Several reports describe the relationship between the presence of ECs in different environments and a high presence of touristic activities on those sites [ 71 , 72 , 73 , 74 ], and recently, this relationship has been reported in mangroves [ 21 , 38 ]. The enforcement of protection laws and environmental planning for mangrove protection from the negative effect of tourism, including the increase in ECs, must be priority actions by any country with mangrove ecosystems.…”

Section: Discussionmentioning

confidence: 99%

“…Today, the effect of anthropogenic activities in mangroves is contradictory. While the presence of ARB and antibiotic resistance genes (ARGs) in mangroves from India was related to anthropogenic activities [21], in other studies, mangroves have been considered as "natural wastewater wetlands" with an active role as nutrient filters and even to reduce the presence of ARG and antibiotics (ABs) in these ecosystems [22][23][24]. Therefore, several questions have arisen: (1) What are the uptake mechanisms developed by mangrove plants to reduce antibiotics and their degradation products from sediments?…”

Section: Introductionmentioning

confidence: 99%

Antibiotics, Multidrug-Resistant Bacteria, and Antibiotic Resistance Genes: Indicators of Contamination in Mangroves?

et al. 2021

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Multidrug-resistant bacteria and antibiotic resistance genes can be monitored as indicators of contamination in several environments. Mangroves are among the most productive ecosystems, and although they can be resilient to the action of climate phenomena, their equilibrium can be affected by anthropogenic activities. Regarding the presence and persistence of multidrug-resistant bacteria in mangroves, it is common to think that this ecosystem can function as a reservoir, which can disperse the antibiotic resistance capacity to human pathogens, or serve as a filter to eliminate drug-resistant genes. The possible impact of anthropogenic activities carried out near mangroves is reviewed, including wastewater treatment, food production systems, leisure, and tourism. Adverse effects of antibiotic resistance genes or multidrug-resistant bacteria, considered as emerging contaminants, have not been reported yet in mangroves. On the contrary, mangrove ecosystems can be a natural way to eliminate antibiotics, antibiotic-resistant bacteria, and even antibiotic-resistant genes from the environment. Although mangroves’ role in decreasing antibiotics and antibiotic resistance genes from the environment is being proposed, the mechanisms by which these plants reduce these emerging contaminants have not been elucidated and need further studies. Additionally, further evaluation is needed on the effects of antibiotics and antibiotic-resistant bacteria in mangroves to generate an analysis of the human contribution to the degradation of this specific ecosystem as well as to define if these contaminants can be used as indicators of contamination in mangrove ecosystems.

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“…Microbial diversity and their spatial distribution in Sundarbans mangrove have been previously explored (Basak et al, 2015a;Chakraborty et al, 2015;Dhal et al, 2020). Major studies have been reported on the biotechnological potential of the microorganisms isolated from this mangrove ecosystem (Nag et al, 2018;Bhattacharyya et al, 2019). Nevertheless, there is no report on the physiology and the interaction of microorganisms in response to low nutrient resources.…”

Section: Discussionmentioning

confidence: 99%

Nanotube mediated cell-to-cell communication and cannibalism in Halobacillus sp. GSS1 isolated from Sundarbans, India: A cryptic story of survival under nutrient-limiting condition

Guria

Sengupta

Bhattacharyya

et al. 2020

Preprint

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Microorganisms play a self-protective role by evolving their genetic and metabolic machinery to thrive in extreme environmental habitats. Halophiles are such salt-loving extremophilic microorganisms able to adapt, survive, and tend to grow at high salt concentrations. In this study, we have isolated Halobacillus sp. GSS1 from Sundarbans mangrove, India having a strong salt-tolerant ability (up to 4M) in Zobell Marine 2216 medium. The salt adaptation mechanism of Halobacillus sp. was investigated by Confocal microscopy using [Na+] specific dye, Sodium Green indicating the salt-in strategy for their osmoadaptation. Electron microscopic studies revealed that a contact-dependent cell-to-cell communication was profound among the Halobacillus sp. under nutrient limiting condition. This communication is mediated by nanotube, which is highly recommended for the exchange of molecular information between the two individual bacteria. The existence of the ymdB gene strongly supports our claim for nanotube formation by Halobacillus sp. GSS1. Surprisingly, Halobacillus sp. not only utilizing the nanotubes for communication, rather they desperately use nanotubes as a survival weapon under nutrient limiting conditions by triggering cannibalism. This is the first-ever report on the existence of nanotube mediated cell-to-cell communication and cannibalism in any halophilic bacteria, isolated from Sundarbans mangrove forest, India.

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Anthropogenic influence shapes the distribution of antibiotic resistant bacteria (ARB) in the sediment of Sundarban estuary in India

Cited by 47 publications

References 74 publications

Metagenomic insights into surface water microbial communities of a South Asian mangrove ecosystem

Metagenomic insights into surface water microbial communities of a South Asian mangrove ecosystem

Antibiotics, Multidrug-Resistant Bacteria, and Antibiotic Resistance Genes: Indicators of Contamination in Mangroves?

Nanotube mediated cell-to-cell communication and cannibalism in Halobacillus sp. GSS1 isolated from Sundarbans, India: A cryptic story of survival under nutrient-limiting condition

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