Microbial Diversity in the Indian Ocean Sediments: An Insight into the Distribution and Associated Factors

Ambati, Madhav; Kumar, Maushmi S.

doi:10.1007/s00284-022-02801-z

Cited by 9 publications

(2 citation statements)

References 79 publications

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“…7c ). The different geographic distribution patterns between viral and prokaryotic communities may be explained by the fact that the factors influencing prokaryotic communities are complex and diverse 86 , 87 . While the virus is indeed a significant factor in shaping host communities, other factors such as grazing and environmental conditions (e.g., depth, salinity, temperature, and nutrients) also play important roles in shaping prokaryotic communities 86 , 87 .…”

Section: Resultsmentioning

confidence: 99%

“…The different geographic distribution patterns between viral and prokaryotic communities may be explained by the fact that the factors influencing prokaryotic communities are complex and diverse 86 , 87 . While the virus is indeed a significant factor in shaping host communities, other factors such as grazing and environmental conditions (e.g., depth, salinity, temperature, and nutrients) also play important roles in shaping prokaryotic communities 86 , 87 . In addition, although our results showed that virus and host communities in deep-sea seamount sediments are interacting through close associations, a substantial proportion of seamount viruses was revealed to be temperate (Fig.…”

Section: Resultsmentioning

confidence: 99%

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Diversity and potential host-interactions of viruses inhabiting deep-sea seamount sediments

Yu,

Zhang,

Zeng

et al. 2024

Nat Commun

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Seamounts are globally distributed across the oceans and form one of the major oceanic biomes. Here, we utilized combined analyses of bulk metagenome and virome to study viral communities in seamount sediments in the western Pacific Ocean. Phylogenetic analyses and the protein-sharing network demonstrate extensive diversity and previously unknown viral clades. Inference of virus-host linkages uncovers extensive interactions between viruses and dominant prokaryote lineages, and suggests that viruses play significant roles in carbon, sulfur, and nitrogen cycling by compensating or augmenting host metabolisms. Moreover, temperate viruses are predicted to be prevalent in seamount sediments, which tend to carry auxiliary metabolic genes for host survivability. Intriguingly, the geographical features of seamounts likely compromise the connectivity of viral communities and thus contribute to the high divergence of viral genetic spaces and populations across seamounts. Altogether, these findings provides knowledge essential for understanding the biogeography and ecological roles of viruses in globally widespread seamounts.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Diversity and potential host-interactions of viruses inhabiting deep-sea seamount sediments

Yu,

Zhang,

Zeng

et al. 2024

Nat Commun

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Depth-Dependent Distribution of Prokaryotes in Sediments of the Manganese Crust on Nazimov Guyots of the Magellan Seamounts

Sun,

Zhou,

Cheng

et al. 2023

Microb Ecol

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Deep ocean polymetallic nodules, rich in cobalt, nickel, and titanium which are commonly used in high-technology and biotechnology applications, are being eyed for green energy transition through deep-sea mining operations. Prokaryotic communities underneath polymetallic nodules could participate in deep-sea biogeochemical cycling, however, are not fully described. To address this gap, we collected sediment cores from Nazimov guyots, where polymetallic nodules exist, to explore the diversity and vertical distribution of prokaryotic communities. Our 16S rRNA amplicon sequencing data, quantitative PCR results and phylogenetic beta diversity indices showed that prokaryotic diversity in the sur cial layers (0-8 cm) was > 4-fold higher compared to deeper horizons (8-26 cm), while heterotrophs dominated in all sediment horizons. Proteobacteria was the most abundant taxon (32-82%) across all sediment depths, followed by Thaumarchaeota (4-37%), Firmicutes (2-18%) and Planctomycetes (1-6%). Depth was the key factor controlling prokaryotic distribution, while heavy metals (e.g., iron, copper, nickel, cobalt, zinc) can also in uence signi cantly the downcore distribution of prokaryotic communities. Analyses of phylogenetic diversity showed that deterministic processes governing prokaryotic assembly in sur cial layers, contrasting with stochastic in uences in deep layers. This was further supported from the detection of a more complex prokaryotic cooccurrence network in the sur cial layer which suggested more diverse prokaryotic communities existed in the surface vs. deeper sediments. This study expands current knowledge on the vertical distribution of benthic prokaryotic diversity in deep sea settings underneath polymetallic nodules, and the results reported might set a baseline for future mining decisions. Sample Collection and Environmental CharacterizationOne sediment core was collected from surface to 26 cm below sea oor (cmbsf) at the Nazimov guyots in Magellan seamount (162.45 °E, 15.18 °N, 5365 m seawater depth) using a four-tube multitube sampler (MC-400, 10×58 cm, Ocean Environmental Sci.&Tech.) during the Dayang 61st-I cruise of P. R. China. Brie y, the sediment core was sliced at 2-cm intervals with a stainless-steel cutter at 13 different sediment intervals (n = 13 samples). A sterile spatula was used to carefully collect sediment from the center of each sediment horizon for DNA extraction to avoid potential contamination. Samples were transferred to sterilized plastic tubes and stored at -80 °C until DNA extraction, and analyses of selected environmental factors like pH, electrical conductivity (EC), available phosphorous (AP), available potassium (AK), available nitrogen (AN), and organic carbon (OC), according to [30,31]. We note that our analyses on AN and AP provide bulk estimations of available N and P in the sediments without further speciation on the contribution of inorganic vs. organic sources. Brie y, samples were air-dried at room temperature in the shade and sieved through a 2-mm screen. The pH an...

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Dynamic stratification and biogeochemical cycling response of microbial communities in east indian ocean ridge

Li,

Guo,

2024

Chemical Engineering Journal

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Microbial Diversity in the Indian Ocean Sediments: An Insight into the Distribution and Associated Factors

Cited by 9 publications

References 79 publications

Diversity and potential host-interactions of viruses inhabiting deep-sea seamount sediments

Diversity and potential host-interactions of viruses inhabiting deep-sea seamount sediments

Depth-Dependent Distribution of Prokaryotes in Sediments of the Manganese Crust on Nazimov Guyots of the Magellan Seamounts

Dynamic stratification and biogeochemical cycling response of microbial communities in east indian ocean ridge

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