Bacterial diversity in relatively pristine and anthropogenically-influenced mangrove ecosystems (Goa, India)

Fernandes, Sheryl Oliveira; Kirchman, David L.; Michotey, Valérie; Bonin, Patricia; LokaBharathi, P.A.

doi:10.1590/s1517-83822014000400006

Cited by 43 publications

(28 citation statements)

References 61 publications

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“…Furthermore, higher eutrophic conditions can also lead to higher labile organic carbon inputs, which was apparent in transect A (Liu et al, 2016). Elevated nutrient load in combination with labile organic carbon availability favors the fast-growing r-strategist microbes (Fernandes, Kirchman, Michotey, Bonin, & LokaBharathi, 2014;Pinhassi & Berman, 2003;Trevathan-Tackett et al, 2017) and is likely linked to the higher relative abundances of Gammaproteobacteria, like Vibrionales, Alteromonadales, and Pseudomonadales, in transect A.…”

Section: Responses Of Bacterial and Pathogenic Community Structure mentioning

confidence: 97%

Effects of nutrient loading on sediment bacterial and pathogen communities within seagrass meadows

et al. 2018

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Eutrophication can play a significant role in seagrass decline and habitat loss. Microorganisms in seagrass sediments are essential to many important ecosystem processes, including nutrient cycling and seagrass ecosystem health. However, current knowledge of the bacterial communities, both beneficial and detrimental, within seagrass meadows in response to nutrient loading is limited. We studied the response of sediment bacterial and pathogen communities to nutrient enrichment on a tropical seagrass meadow in Xincun Bay, South China Sea. The bacterial taxonomic groups across all sites were dominated by the Gammaproteobacteria and Firmicutes. Sites nearest to the nutrient source and with the highest NH4 + and PO4 3− content had approximately double the relative abundance of putative denitrifiers Vibrionales, Alteromonadales, and Pseudomonadales. Additionally, the relative abundance of potential pathogen groups, especially Vibrio spp. and Pseudoalteromonas spp., was approximately 2‐fold greater at the sites with the highest nutrient loads compared to sites further from the source. These results suggest that proximity to sources of nutrient pollution increases the occurrence of potential bacterial pathogens that could affect fishes, invertebrates and humans. This study shows that nutrient enrichment does elicit shifts in bacterial community diversity and likely their function in local biogeochemical cycling and as a potential source of infectious diseases within seagrass meadows.

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Section: Responses Of Bacterial and Pathogenic Community Structure mentioning

confidence: 97%

Effects of nutrient loading on sediment bacterial and pathogen communities within seagrass meadows

et al. 2018

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“…Dona Paula, Cortalim, Chicalim and Siridao were sampled in the Zuari estuary, and Campal was sampled in the Mandovi estuary. Previously, the dominance of cultivable Vibrio, Alteromonas, Aeromonas, Enterobacter, Marinobacter, and Exiquinobacterium have been reported in the Zuari estuary (Khandeparker et al 2011;Fernandes et al 2014;Khandeparker et al 2015). The Dona Paula station in Zuari estuary showed a high abundance of cultivable V. cholerae in the monsoon season (Khandeparker et al 2015).…”

Section: Resultsmentioning

confidence: 94%

Application of Fluorescence in situ hybridization-Flow cytometry (FISH-FCM) technique to detect and quantify Vibrio cholerae population from different geographic regions

Khandeparker

Desai

Anil

et al. 2018

AJSTD

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Rapid and species-specific detection, and quantification of pathogenic bacteria are fundamental for monitoring and assessment of the risk they pose to any ecosystem. The study employed Vibrio cholerae, a human pathogen responsible for the life-threatening diarrhoeal disease, cholera and one among the most unwanted from marine bioinvasion point of view. The present study coupled fluorescence in situ hybridization (FISH) technique, a powerful tool in molecular phylogenetic discrimination, with flow cytometry (FCM), a technique used for rapid and accurate quantification of both viable but non-cultivable and non-viable microorganisms. The FISH-FCM technique was used for the first time to quantify V. cholerae (includes cultivable and non-cultivable) from different geographic regions of Southeast Asia (Brunei, Indonesia, Lao PDR, Myanmar, Philippines, Singapore, Thailand, Vietnam) and India (Goa, west coast of India). The data acquired from the analyses provides a snap shot view of the total bacterial abundance with special reference to V. cholerae. As the method developed, it was evaluated with bacterial samples collected from different sites in Southeast Asia and India, and the application of this technique to different geographical regions appears feasible. Considering that the continuous growth of the shipping industry and ballast water as one of the primary vectors responsible for the global transport of pathogenic microorganisms, the risk they present needs immediate attention. This technique will be useful in the quick and accurate detection of specific pathogens. It may also provide significant insights to quarantine measures for Ballast Water Management.

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“…10 reflected the possibility of higher abundance of generalists as compared to sensitive species (Jordaan et al, 2019) as microbial communities generally adapt to permanent stress events such as increased concentrations of inorganic or organic nutrients. In another study conducted by Fernandes et al (2014), anthropogenicallyinfluenced mangroves had 2x higher the amount of γ-Proteobacteria compared to pristine mangroves.…”

Section: Possible Pathogenic Bacteria And/or Anthropogenic Influence mentioning

confidence: 89%

Biogeographical distribution of Microbial Communities along the Rajang River-South China Sea Continuum

Sia¹,

Zhu²,

Zhang³

et al. 2019

Preprint

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Abstract. Microbial community composition and diversity in freshwater habitats, especially in lotic environments, are much less studied compared to marine and soil communities. The Rajang River is the main drainage system for central Sarawak in Malaysian Borneo and passes through peat domes whereby peat-rich material is being fed into the system and eventually into the southern South China Sea. Microbial communities found within peat-rich systems are important biogeochemical cyclers in terms of methane and carbon dioxide sequestration. To address the critical lack of knowledge about microbial communities in tropical (peat-draining) rivers, this study represents the first seasonal assessment targeted at establishing a foundational understanding of the microbial communities of the Rajang River-South China Sea continuum. This was carried out utilizing 16S rRNA gene amplicon sequencing via Illumina MiSeq in size-fractionated samples (0.2 and 3.0 μm GF/C filter membranes) covering different biogeographical features/sources from headwaters to coastal waters. The microbial communities found along the Rajang river exhibited taxa common to rivers (i.e. the predominance of β-Proteobacteria) while estuarine and marine regions exhibited taxa that were common to the aforementioned regions as well (i.e. predominance of α- and γ-Proteobacteria). This is in agreement with studies from other rivers which observed similar changes along the salinity gradients. In terms of particulate versus free-living bacteria, nonmetric multi-dimensional scaling (NMDS) results showed similarly distributed microbial communities with varying separation between seasons. Distinct patterns were observed based on linear models as a result of the changes in salinity along with variation of other biogeochemical parameters. Alpha diversity indices indicated that microbial communities were higher in diversity upstream compared to the marine and estuarine regions whereas anthropogenic perturbations led to increased richness but less diversity. Despite the observed changes in bacterial community composition and diversity that occur along the Rajang River to sea continuum, the PICRUST predictions showed minor variations. The results provide essential context for future studies such as further analyses on the ecosystem health in response to anthropogenic land-use practices and probable development of biomarkers to improve the monitoring of water quality in this region.

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Bacterial diversity in relatively pristine and anthropogenically-influenced mangrove ecosystems (Goa, India)

Cited by 43 publications

References 61 publications

Effects of nutrient loading on sediment bacterial and pathogen communities within seagrass meadows

Effects of nutrient loading on sediment bacterial and pathogen communities within seagrass meadows

Application of Fluorescence in situ hybridization-Flow cytometry (FISH-FCM) technique to detect and quantify Vibrio cholerae population from different geographic regions

Biogeographical distribution of Microbial Communities along the Rajang River-South China Sea Continuum

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