Distribution of microbial communities in metal-contaminated nearshore sediment from Eastern Guangdong, China

Zhuang, Mei; Sanganyado, Edmond; Li, Ping; Liu, Wenhua

doi:10.1016/j.envpol.2019.04.041

Cited by 67 publications

(19 citation statements)

References 54 publications

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“…At the class level, Gammaproteobacteria and Deltaproteobacteria, belonging to Proteobacteria, were two dominant groups with relative abundance of 20.26% and 16.04%, respectively (Figure 2b). Those results were consistent with the previous study in the same sampling area at different seasons, with two main class groups of Gammaproteobacteria and Deltaproteobacteria [27]. Moreover, several studies in nearshore sediment from different regions found similar results [32,33].…”

Section: Resultssupporting

confidence: 92%

“…The diversity of sediment bacteria from this study was high with an average Shannon index of over 6.00 compared to the average Shannon index of 3.27 reported in the South China Seas, respectively [31]. The diversity indices of the present study were similar to those obtained in samples collected the following year in our previous study suggesting there was no apparent change in microbial diversity over the time period [27]. Proteobacteria was the dominant phylum in all samples with the average relative abundance of 46.17%.…”

Section: Resultssupporting

confidence: 77%

“…Details of the procedures for assessing the physicochemical properties and metal concentration in these samples was provided in our previous study [27]. Briefly, inorganic nutrients (NO 3− , NO 2− , NH 4 + , PO 4 3− , and SO 3 2− ) were determined using the "the specialties for oceanography survey" standard procedures (GB17378.4e2007, China) while salinity and TOC were analyzed using a smarTROLLTM multiparameter system (In-Situ Inc., Fort Collins, CO, USA) and an elemental analyzer (Multi N/C 2100, Germany), respectively.…”

Section: Sample Collection and Chemical Analysismentioning

confidence: 99%

“…The microbial genomic DNA extraction from sediment samples and the polymerase chain reaction (PCR) were conducted according to our previous study [27]. Briefly, an OMEGA E.Z.N.A.…”

Section: Dna Extraction and High-throughput Sequencingmentioning

confidence: 99%

“…The region surrounding Shantou Bay contributes more than 10% global production of lingerie and toys, industries which consume large volumes of azo dyes [6]. In the present study, we examined the distribution and diversity of azo dye degradation genes in nearshore sediment samples for which the physicochemical properties and metal pollution levels (i.e., salinity, total organic carbon (TOC), NO 3− , NO 2− , NH 4 + , PO 4 3− , SO 3 2− , Cu, Cr, As, Pb, Hg, and Zn) were characterized in our previous study [27].…”

Section: Introductionmentioning

confidence: 99%

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High Throughput Sediment DNA Sequencing Reveals Azo Dye Degrading Bacteria Inhabit Nearshore Sediments

Zhuang

Sanganyado

et al. 2020

Microorganisms

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Estuaries and coastal environments are often regarded as a critical resource for the bioremediation of organic pollutants such as azo dyes due to their high abundance and diversity of extremophiles. Bioremediation through the activities of azoreductase, laccase, and other associated enzymes plays a critical role in the removal of azo dyes in built and natural environments. However, little is known about the biodegradation genes and azo dye degradation genes residing in sediments from coastal and estuarine environments. In this study, high-throughput sequencing (16S rRNA) of sediment DNA was used to explore the distribution of azo-dye degrading bacteria and their functional genes in estuaries and coastal environments. Unlike laccase genes, azoreductase (azoR), and naphthalene degrading genes were ubiquitous in the coastal and estuarine environments. The relative abundances of most functional genes were higher in the summer compared to winter at locations proximal to the mouths of the Hanjiang River and its distributaries. These results suggested inland river discharges influenced the occurrence and abundance of azo dye degrading genes in the nearshore environments. Furthermore, the azoR genes had a significant negative relationship with total organic carbon, Hg, and Cr (p < 0.05). This study provides critical insights into the biodegradation potential of indigenous microbial communities in nearshore environments and the influence of environmental factors on microbial structure, composition, and function which is essential for the development of technologies for bioremediation in azo dye contaminated sites.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 77%

Section: Sample Collection and Chemical Analysismentioning

confidence: 99%

“…The microbial genomic DNA extraction from sediment samples and the polymerase chain reaction (PCR) were conducted according to our previous study [27]. Briefly, an OMEGA E.Z.N.A.…”

Section: Dna Extraction and High-throughput Sequencingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High Throughput Sediment DNA Sequencing Reveals Azo Dye Degrading Bacteria Inhabit Nearshore Sediments

Zhuang

Sanganyado

et al. 2020

Microorganisms

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Seasonal distribution of the Indo‐Pacific humpback dolphins: Implications for coastal habitat management

Wang

et al. 2021

Aquatic Conservation

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Organisms utilize suitable habitat patches wherein they optimize fitness. For marine megafauna such as cetaceans, foraging is generally the explanation for their utilization distribution. However, an explicit link between cetaceans' distribution and spatio‐temporal pattern of food resource is usually lacking. The Indo‐Pacific humpback dolphin (Sousa chinensis; VU listed in the IUCN Red List) inhabits the coastal waters from south‐east China to eastern India. Seasonal distribution of the humpback dolphin was explored in the northern Beibu Gulf, China. Sightings of the humpback dolphin were systematically collected at monthly intervals from 2012 winter till 2018 spring and used to derive distribution patterns from kernel density estimates. Satellite remotely sensed net primary productivity (NPP) and bathymetry were used to present oceanographic characteristics in the study region. Seasonal variations were observed in oceanographic characteristics and spatial distribution of the humpback dolphin. Although the core distribution area of the humpback dolphin showed seasonal expansion and contraction, it had consistently higher NPP and shallower depth than the survey range throughout the seasons. Our findings indicate a clear profile of these two oceanographic characteristics (i.e. NPP and bathymetry) in the humpback dolphin's core distribution area. Food resource utilization could play an important role in the humpback dolphin's distribution within the study site. The seasonal dynamics imply that not only food abundance, but also efficiency in accessing/capturing the prey may affect distribution of the humpback dolphin. In the study site, human activities that can change regional topography and productivity of the coastal water through land reclamation, dredging, sand mining and bottom trawling, should be mitigated, regulated or avoided. Proactive conservation should incorporate catchment management of the main rivers to address potential sediment and nutrient load into the estuary to protect local habitat configuration in terms of NPP and bathymetry.

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Conservation planning for threatened marine megafauna: Moving forward with a better approach

Huang

et al. 2022

Aquatic Conservation

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1. For threatened marine megafauna, such as the Indo-Pacific humpback dolphin (Sousa chinensis), sound conservation planning should aim to ensure demographic and ecological persistence of populations. One method to address this challenge is through ecosystem-based conservation planning (ECP) based on threatened marine megafauna distribution, biodiversity richness, and ecosystem functionality. 2. ECP exercises for the Indo-Pacific humpback dolphin in Chinese and adjacent northern Vietnamese waters were conducted based on the Indo-Pacific humpback dolphin distribution, Hill-2 biodiversity index, and marine net primary productivity. Habitat protection priorities were scored using the program MARXAN and were used to identify special areas for conservation (SACs) for the Indo-Pacific humpback dolphin. 3. To ensure the minimal risk of local extinction, the SACs enclosed a total of 26,858 km 2 of waters, accounting for 49.9% of core habitats of the Indo-Pacific humpback dolphin and 24.3% of the IUCN Red List species in the study region. To enclose 30% of biodiversity richness and ecosystem functionality, a total of 40,179 km 2 SACs was required. 4. In the context of threatened marine megafauna conservation, megafauna distribution can be used to highlight focal areas, while information on biodiversity richness and ecosystem functionality should be factored in. Using surrogates with different ecological niches would be a better tactic to ensure sufficient protection coverage by minimizing the omission bias. 5. The conservation of threatened marine megafauna in coastal and estuarine waters shares similar objectives with global marine biodiversity conservation. The challenges to conduct ECP exercises come from data scarcity and poor data quality in representing distributions of biodiversity features. A certified openaccess database that shares survey effort, occurrence, population density, and habitat mapping at national and local scales is recommended. Such a result requires national planning, investment, and policing. Shiang-Lin Huang and Haiping Wu contributed equally to this article.

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Distribution of microbial communities in metal-contaminated nearshore sediment from Eastern Guangdong, China

Cited by 67 publications

References 54 publications

High Throughput Sediment DNA Sequencing Reveals Azo Dye Degrading Bacteria Inhabit Nearshore Sediments

High Throughput Sediment DNA Sequencing Reveals Azo Dye Degrading Bacteria Inhabit Nearshore Sediments

Seasonal distribution of the Indo‐Pacific humpback dolphins: Implications for coastal habitat management

Conservation planning for threatened marine megafauna: Moving forward with a better approach

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