Response of particle-associated bacteria to long-term heavy metal contamination in a tropical estuary

Sheeba, V A; Anas, Abdulaziz; Corso, Jasmin; Vincent, Manu; Parameswaran, P.S.

doi:10.1007/s11274-020-02842-1

Cited by 8 publications

(1 citation statement)

References 59 publications

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“…Copper sulfate treatment selected for metal-tolerant bacteria, and bacterial biomarkers of the fish mucosal microbiota may act as indicators of heavy metal pollution as suggested by Montenegro et al [ 60 ]. Catenococcus (enriched in Captive-1) and Halomonas and Marinobacter (enriched in Captive-2) were found in high abundances downstream of a metal-polluted estuary where many copper tolerant isolates were collected [ 61 ] and may be bioindicators of copper contamination. Additionally, the genera Halomonas and Marinobacter positively correlate with environmental pollutants, such as polycyclic aromatic hydrocarbons and metals [ 60 ] and perform denitrification using a nitrite reductase (nirK) that requires and is positively correlated with copper [ 62 ].…”

Section: Discussionmentioning

confidence: 99%

Effect of copper sulfate on the external microbiota of adult common snook (Centropomus undecimalis)

et al. 2021

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Background The environment exerts a strong influence on the fish external microbiota, with lower diversity and increased abundances of opportunistic bacterial groups characterizing cultured fish compared to their wild counterparts. Deviation from a healthy external microbiota structure has been associated with increased susceptibility to bacterial pathogens. Treatment of wild-caught broodstock with copper sulfate for the removal of external parasites is a common aquaculture practice. Despite the microbiota’s importance to fish health, the effects of copper sulfate on mucosal bacterial communities and their ability to recover following this chemical treatment have not been examined. The skin microbiota of adult common snook was characterized from wild individuals (Wild), and wild-caught fish maintained in recirculating aquaculture systems (RAS) immediately following a month-long copper sulfate treatment (Captive-1), and then two-weeks (Captive-2) and 2 years (Captive-3) after cessation of copper treatment. Results The skin microbiota of wild fish were characterized by high diversity and taxa including Synechocococcus, SAR11, and a member of the Roseobacter clade. Bacterial diversity decreased in Captive individuals during the 2-year sampling period. Captive fish harbored greater abundances of Firmicutes, which may reflect glycan differences between aquaculture and natural feeds. Bacterial taxa with copper resistance mechanisms and indicative of metal contamination were enriched in Captive-1 and Captive-2 fish. Vibrionaceae were dominant in Captive fish, particularly immediately and 2 weeks following copper treatment. Based on our observations and previous literature, our results suggest putatively beneficial taxa amass over time in captivity. Within 2 years, Captive individuals harbored Bacillus which contains numerous probiotic candidates and the complex carbon degraders of the family Saprospiraceae. Predicted butanoate metabolism exceeded that of Wild fish, and its reported roles in immunity and energy provision suggest a prebiotic effect for fishes. Conclusions The mucosal microbiota contains bacterial taxa that may act as bioindicators of environmental pollution. Increases in mutualistic groups indicate a return to a beneficial skin microbiota following copper sulfate treatment. Our data also suggests that vastly different taxa, influenced by environmental conditions, can be associated with adult fish without noticeable health impairment, perhaps due to establishment of various mutualists to maintain fish mucosal health.

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Section: Discussionmentioning

confidence: 99%

Effect of copper sulfate on the external microbiota of adult common snook (Centropomus undecimalis)

et al. 2021

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Impact of environmental factors on diversity of fungi in sediments from the Shenzhen River Estuary

et al. 2023

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In this study, to explore the relationship between environmental factors and fungal diversity in the Shenzhen River ecosystem, multiple methods including chemical analysis, culture isolation, qPCR analysis of fungal ITS region and ITS-based Illumina next-generation-sequencing were integrated. A total of 115 isolates were finally isolated and could be classified into 23 genera. Top three abundant genera isolated were Meyerozyma (18 strains), Aspergillus (17 strains) and Penicillium (14 strains). Based on the Illumina sequencing approach, 829 OTUs were affiliated to seven phyla, 17 known classes, and 162 genera, indicating the Shenzhen estuary sediments are rich in fungal diversity. The major fungal genera were Meyerozyma, Trichoderma and Talaromyces. Environmental factors showed a gradient change in Shenzhen estuary, and fungal abundance was only significantly correlated with NH4+. Shannon index was significantly correlated with pH and IC (P < 0.05). Principal coordinate analysis based on OTU level grouped into three clusters among sampling sites along with the IC and pH gradient. Functional guilds analysis suggests most of the fungi in this studying area were almost all saprotrophs, suggesting a large number of saprophytic fungi may play a significant role in the organic matter decomposition and nutrient cycling process. In summary, this study will deepen our understanding of fungi community in Shenzhen River ecosystem and their distribution and potential function shaped by environmental factors.

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Fractionation and accumulation of selected metals in a tropical estuary, south-west coast of India

Jayasooryan

Ramasamy

Chandini

et al. 2021

Environ Monit Assess

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Response of particle-associated bacteria to long-term heavy metal contamination in a tropical estuary

Cited by 8 publications

References 59 publications

Effect of copper sulfate on the external microbiota of adult common snook (Centropomus undecimalis)

Effect of copper sulfate on the external microbiota of adult common snook (Centropomus undecimalis)

Impact of environmental factors on diversity of fungi in sediments from the Shenzhen River Estuary

Fractionation and accumulation of selected metals in a tropical estuary, south-west coast of India

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