Macrofaunal control of microbial community structure in continental margin sediments

Deng, Longhui; Bölsterli, Damian; Kristensen, Erik; Meile, Christof; Su, Chih-Chieh; Bernasconi, Stefano M.; Seidenkrantz, Marit‐Solveig; Glombitza, Clemens; Lagostina, Lorenzo; Han, Xingguo; Jørgensen, Bo Barker; Røy, Hans; Lever, Mark A.

doi:10.1073/pnas.1917494117

Cited by 45 publications

(61 citation statements)

References 84 publications

(116 reference statements)

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“…modelling and measured O2 [29]) and bioturbation [50], consistent with expectations for a continental shelf system [100]. The extent of successional redox associated processes controlling the cycling of carbon in sediments at and below the SWI is coupled closely to the environmental setting (Barents Sea continental shelf) and is likely to be sensitive to future changes, especially those driven by atmospheric and oceanic warming.…”

Section: Iv)supporting

confidence: 71%

Transformation of organic matter in a Barents Sea sediment profile: coupled geochemical and microbiological processes

Stevenson

Faust

Andrade

et al. 2020

Phil. Trans. R. Soc. A.

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Process-based, mechanistic investigations of organic matter transformation and diagenesis directly beneath the sediment–water interface (SWI) in Arctic continental shelves are vital as these regions are at greatest risk of future change. This is in part due to disruptions in benthic–pelagic coupling associated with ocean current change and sea ice retreat. Here, we focus on a high-resolution, multi-disciplinary set of measurements that illustrate how microbial processes involved in the degradation of organic matter are directly coupled with inorganic and organic geochemical sediment properties (measured and modelled) as well as the extent/depth of bioturbation. We find direct links between aerobic processes, reactive organic carbon and highest abundances of bacteria and archaea in the uppermost layer (0–4.5 cm depth) followed by dominance of microbes involved in nitrate/nitrite and iron/manganese reduction across the oxic-anoxic redox boundary (approx. 4.5–10.5 cm depth). Sulfate reducers dominate in the deeper (approx. 10.5–33 cm) anoxic sediments which is consistent with the modelled reactive transport framework. Importantly, organic matter reactivity as tracked by organic geochemical parameters ( n -alkanes, n -alkanoic acids, n -alkanols and sterols) changes most dramatically at and directly below the SWI together with sedimentology and biological activity but remained relatively unchanged across deeper changes in sedimentology. This article is part of the theme issue ‘The changing Arctic Ocean: consequences for biological communities, biogeochemical processes and ecosystem functioning’.

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Section: Iv)supporting

confidence: 71%

Transformation of organic matter in a Barents Sea sediment profile: coupled geochemical and microbiological processes

Stevenson

Faust

Andrade

et al. 2020

Phil. Trans. R. Soc. A.

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“…Opitutaceae include species that are widely distributed in a variety of aquatic and terrestrial environments; and their ecological contributions remain to be understood ( Rodrigues and Isanapong, 2014 ). A recent environmental sequencing study identified 16S rRNA gene sequences of Opitutaceae as members of “ Type 1 bioturbation lineages” associated with burrowing activities of marine benthic macroinvertebrates ( Deng et al, 2020 ).…”

Section: Discussionmentioning

confidence: 99%

Global Trends of Benthic Bacterial Diversity and Community Composition Along Organic Enrichment Gradients of Salmon Farms

et al. 2021

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The analysis of benthic bacterial community structure has emerged as a powerful alternative to traditional microscopy-based taxonomic approaches to monitor aquaculture disturbance in coastal environments. However, local bacterial diversity and community composition vary with season, biogeographic region, hydrology, sediment texture, and aquafarm-specific parameters. Therefore, without an understanding of the inherent variation contained within community complexes, bacterial diversity surveys conducted at individual farms, countries, or specific seasons may not be able to infer global universal pictures of bacterial community diversity and composition at different degrees of aquaculture disturbance. We have analyzed environmental DNA (eDNA) metabarcodes (V3–V4 region of the hypervariable SSU rRNA gene) of 138 samples of different farms located in different major salmon-producing countries. For these samples, we identified universal bacterial core taxa that indicate high, moderate, and low aquaculture impact, regardless of sampling season, sampled country, seafloor substrate type, or local farming and environmental conditions. We also discuss bacterial taxon groups that are specific for individual local conditions. We then link the metabolic properties of the identified bacterial taxon groups to benthic processes, which provides a better understanding of universal benthic ecosystem function(ing) of coastal aquaculture sites. Our results may further guide the continuing development of a practical and generic bacterial eDNA-based environmental monitoring approach.

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“…(Notably, we observed advective fluid flow through the Point Dume chimneys, and ongoing geochemical analyses are aimed at further establishing the composition of these fluids.) Sediments, in contrast, may have more distributed channel networks with greater tortuosity and lower fluid flow rates and could be susceptible to disruption by bioturbation (35,36). That said, endolithic communities that accelerate carbonate and metal sulfide precipitation can seemingly self-entomb (37), and the longterm implications of such processes warrant further study.…”

Section: Rates Of Aommentioning

confidence: 99%

Carbonate-hosted microbial communities are prolific and pervasive methane oxidizers at geologically diverse marine methane seep sites

Marlow

Hoer

Jungbluth

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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At marine methane seeps, vast quantities of methane move through the shallow subseafloor, where it is largely consumed by microbial communities. This process plays an important role in global methane dynamics, but we have yet to identify all of the methane sinks in the deep sea. Here, we conducted a continental-scale survey of seven geologically diverse seafloor seeps and found that carbonate rocks from all sites host methane-oxidizing microbial communities with substantial methanotrophic potential. In laboratory-based mesocosm incubations, chimney-like carbonates from the newly described Point Dume seep off the coast of Southern California exhibited the highest rates of anaerobic methane oxidation measured to date. After a thorough analysis of physicochemical, electrical, and biological factors, we attribute this substantial metabolic activity largely to higher cell density, mineral composition, kinetic parameters including an elevated Vmax, and the presence of specific microbial lineages. Our data also suggest that other features, such as electrical conductance, rock particle size, and microbial community alpha diversity, may influence a sample’s methanotrophic potential, but these factors did not demonstrate clear patterns with respect to methane oxidation rates. Based on the apparent pervasiveness within seep carbonates of microbial communities capable of performing anaerobic oxidation of methane, as well as the frequent occurrence of carbonates at seeps, we suggest that rock-hosted methanotrophy may be an important contributor to marine methane consumption.

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Macrofaunal control of microbial community structure in continental margin sediments

Cited by 45 publications

References 84 publications

Transformation of organic matter in a Barents Sea sediment profile: coupled geochemical and microbiological processes

Transformation of organic matter in a Barents Sea sediment profile: coupled geochemical and microbiological processes

Global Trends of Benthic Bacterial Diversity and Community Composition Along Organic Enrichment Gradients of Salmon Farms

Carbonate-hosted microbial communities are prolific and pervasive methane oxidizers at geologically diverse marine methane seep sites

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