Biotic interactions between benthic infauna and aerobic methanotrophs mediate methane fluxes from coastal sediments

Elias Broman, Markus Olsson, Adele Maciute, Daniel Donald, Christoph Humborg, Alf Norkko, Tom Jilbert, Stefano Bonaglia, Francisco J A Nascimento
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Abstract

Coastal ecosystems dominate oceanic methane (CH4) emissions. However, there is limited knowledge about how biotic interactions between infauna and aerobic methanotrophs (i.e. CH4 oxidizing bacteria) drive the spatial–temporal dynamics of these emissions. Here, we investigated the role of meio- and macrofauna in mediating CH4 sediment–water fluxes and aerobic methanotrophic activity that can oxidize significant portions of CH4. We show that macrofauna increases CH4 fluxes by enhancing vertical solute transport through bioturbation, but this effect is somewhat offset by high meiofauna abundance. The increase in CH4 flux reduces CH4 pore-water availability, resulting in lower abundance and activity of aerobic methanotrophs, an effect that counterbalances the potential stimulation of these bacteria by higher oxygen flux to the sediment via bioturbation. These findings indicate that a larger than previously thought portion of CH4 emissions from coastal ecosystems is due to faunal activity and multiple complex interactions with methanotrophs.
底栖生物和好氧甲烷营养体之间的生物相互作用介导了沿海沉积物的甲烷通量
沿海生态系统在海洋甲烷(CH4)排放中占主导地位。然而,人们对底栖生物和好氧甲烷营养体(即 CH4 氧化细菌)之间的生物相互作用如何推动这些排放的时空动态了解有限。在此,我们研究了小型和大型底栖生物在调节 CH4 沉积物-水通量和好氧甲烷营养活动(可氧化大量 CH4)中的作用。我们的研究表明,大型底栖生物通过生物扰动加强垂直溶质迁移,从而增加了甲烷通量,但这一作用在一定程度上被丰富的小型底栖生物所抵消。甲烷通量的增加降低了甲烷孔隙水的可利用性,导致好氧甲烷滋养菌的丰度和活性降低,这种影响抵消了通过生物扰动提高沉积物氧通量对这些细菌的潜在刺激作用。这些研究结果表明,沿岸生态系统的甲烷排放量中有很大一部分是由于动物的活动以及与甲烷营养盐的多种复杂的相互作用造成的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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