Macrofaunal control of microbial community structure in continental margin sediments

Longhui Deng, Damian Bölsterli, Erik Kristensen, Christof Meile, Chih-Chieh Su, Stefano Michele Bernasconi, Marit-Solveig Seidenkrantz, Clemens Glombitza, Lorenzo Lagostina, Xingguo Han, Bo Barker Jørgensen, Hans Røy (+1 others)
2020 Proceedings of the National Academy of Sciences of the United States of America  
Through a process called "bioturbation," burrowing macrofauna have altered the seafloor habitat and modified global carbon cycling since the Cambrian. However, the impact of macrofauna on the community structure of microorganisms is poorly understood. Here, we show that microbial communities across bioturbated, but geochemically and sedimentologically divergent, continental margin sites are highly similar but differ clearly from those in nonbioturbated surface and underlying subsurface
more » ... subsurface sediments. Solid- and solute-phase geochemical analyses combined with modeled bioturbation activities reveal that dissolved O2 introduction by burrow ventilation is the major driver of archaeal community structure. By contrast, solid-phase reworking, which regulates the distribution of fresh, algal organic matter, is the main control of bacterial community structure. In nonbioturbated surface sediments and in subsurface sediments, bacterial and archaeal communities are more divergent between locations and appear mainly driven by site-specific differences in organic carbon sources.
doi:10.1073/pnas.1917494117 pmid:32576690 fatcat:zwno2endcra5xo2xft2wnicone