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Meiofauna improve oxygenation and accelerate sulfide removal in the seasonally hypoxic seabed.
Mar Environ Res. 2020 Jul; 159:104968.ME

Abstract

Oxygen depleted areas are widespread in the marine realm. Unlike macrofauna, meiofauna are abundant in hypoxic sediments. We studied to what extent meiofauna affect oxygen availability, sulfide removal and microbial communities. Meiofauna were extracted alive and added to intact sediments simulating abundance gradients previously reported in the area. A total of 324 porewater microprofiles were recorded over a 3-week incubation period and microbial community structure and cable bacteria densities were determined at the end of the experiment. At high abundances meiofauna activity deepened oxygen penetration by 85%, 59%, and 62% after 5, 14, and 22 days, respectively, compared to control sediment with scarce meiofauna. After 6 days, meiofauna increased the volume of oxidized, sulfide-free sediment by 68% and reduced sulfide fluxes from 8.8 to 0.4 mmol m-2 d-1. After 15 days, the difference with the control attenuated due to the presence of a cable bacteria population, which facilitated sulfides oxidation in all treatments. 16S rRNA gene analysis revealed that meiofauna affected microbial community structure (beta diversity). Thus, meiofauna bioturbation plays an important role in deepening oxygen penetration, counteracting euxinia and in structuring microbial diversity of hypoxic sediments. Co-existence with cable bacteria demonstrates neutralism interaction between these two ecosystem engineers.

Authors+Show Affiliations

Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden; Nordcee, Department of Biology, University of Southern Denmark, Denmark. Electronic address: stefano.bonaglia@su.se.Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden.Department of Biosciences, Center for Electromicrobiology, Aarhus University, Aarhus, Denmark.Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden.Nordcee, Department of Biology, University of Southern Denmark, Denmark; Department of Ocean and Environmental Sciences, Tokyo University of Marine Science and Technology, Tokyo, Japan.Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32662428

Citation

Bonaglia, Stefano, et al. "Meiofauna Improve Oxygenation and Accelerate Sulfide Removal in the Seasonally Hypoxic Seabed." Marine Environmental Research, vol. 159, 2020, p. 104968.
Bonaglia S, Hedberg J, Marzocchi U, et al. Meiofauna improve oxygenation and accelerate sulfide removal in the seasonally hypoxic seabed. Mar Environ Res. 2020;159:104968.
Bonaglia, S., Hedberg, J., Marzocchi, U., Iburg, S., Glud, R. N., & Nascimento, F. J. A. (2020). Meiofauna improve oxygenation and accelerate sulfide removal in the seasonally hypoxic seabed. Marine Environmental Research, 159, 104968. https://doi.org/10.1016/j.marenvres.2020.104968
Bonaglia S, et al. Meiofauna Improve Oxygenation and Accelerate Sulfide Removal in the Seasonally Hypoxic Seabed. Mar Environ Res. 2020;159:104968. PubMed PMID: 32662428.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Meiofauna improve oxygenation and accelerate sulfide removal in the seasonally hypoxic seabed. AU - Bonaglia,Stefano, AU - Hedberg,Johanna, AU - Marzocchi,Ugo, AU - Iburg,Sven, AU - Glud,Ronnie N, AU - Nascimento,Francisco J A, Y1 - 2020/03/29/ PY - 2019/12/12/received PY - 2020/03/22/revised PY - 2020/03/25/accepted PY - 2020/7/15/entrez PY - 2020/7/15/pubmed PY - 2020/8/25/medline KW - 16S rRNA sequencing KW - Cable bacteria KW - Hypoxia KW - Meiofauna KW - Microbial communities KW - Nematode KW - Oxygen penetration KW - Sediment KW - Sulfide oxidation SP - 104968 EP - 104968 JF - Marine environmental research JO - Mar Environ Res VL - 159 N2 - Oxygen depleted areas are widespread in the marine realm. Unlike macrofauna, meiofauna are abundant in hypoxic sediments. We studied to what extent meiofauna affect oxygen availability, sulfide removal and microbial communities. Meiofauna were extracted alive and added to intact sediments simulating abundance gradients previously reported in the area. A total of 324 porewater microprofiles were recorded over a 3-week incubation period and microbial community structure and cable bacteria densities were determined at the end of the experiment. At high abundances meiofauna activity deepened oxygen penetration by 85%, 59%, and 62% after 5, 14, and 22 days, respectively, compared to control sediment with scarce meiofauna. After 6 days, meiofauna increased the volume of oxidized, sulfide-free sediment by 68% and reduced sulfide fluxes from 8.8 to 0.4 mmol m-2 d-1. After 15 days, the difference with the control attenuated due to the presence of a cable bacteria population, which facilitated sulfides oxidation in all treatments. 16S rRNA gene analysis revealed that meiofauna affected microbial community structure (beta diversity). Thus, meiofauna bioturbation plays an important role in deepening oxygen penetration, counteracting euxinia and in structuring microbial diversity of hypoxic sediments. Co-existence with cable bacteria demonstrates neutralism interaction between these two ecosystem engineers. SN - 1879-0291 UR - https://www.unboundmedicine.com/medline/citation/32662428/Meiofauna_improve_oxygenation_and_accelerate_sulfide_removal_in_the_seasonally_hypoxic_seabed_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0141-1136(19)30836-0 DB - PRIME DP - Unbound Medicine ER -