73 Sulfide toxicity as key control on anaerobic oxidation of methane in eutrophic coastal sediments Acknowledgements We thank the captain, the crew of RV Electra, and Christoph HumBorg for their assistance with the fieldwork. Arnold van Dijk, Coen Mulder, Helen de Waard, Tom Bastiaan and Liam Kirwan (Utrecht University) are thanked for analytical assistance. Funding This study was funded by ERC Synergy MARIX 854088 (MSMJ, CPS and NAGMvH), NESCC 02001001 (WKL, AJW, MSMJ & CPS), SIAM 024002002 (MJEM, CUW, MSMJ), Havsochvattenmyndigheten DNR 1960-2018 (MH & CPS), VI.Veni.222.332 (WKL), and VI.Veni.212.040 (PDM). We are also grateful to Rasmus Rodineliussen for assistance with sampling, Linnea Kop for ideas and code for data visualization, and Mike Lee for creating the DADA2 tutorial (https://astrobiomike.github.io/amplicon/ dada2_workflow_ex) from which we derived code for the 16S rRNA gene analyses in this study. Supplementary Information 2
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