Abstract
Coastal regions experiencing declining dissolved oxygen are increasing in number and severity around the world. However, despite the importance of microbial metabolism in coastal hypoxia, few metagenomic surveys exist. Our data set from within the second largest human-caused hypoxic region provides opportunities to more deeply explore the microbiology of these systems.
Highlights
Marine systems suffering from declines in dissolved oxygen (DO) are becoming more numerous across the globe [1]
Nitrospina metagenome-assembled genome (MAG) were the only ones with predicted nitrite-oxidizing metabolism, matching observations from 2012 [11]
While the majority of MAGs encoded aerobic metabolism, several taxa had partial to complete pathways for dissimilatory nitrate and/or sulfate reduction (Rhodospirillales and Polaribacter), including dissimilatory nitrate reduction to ammonium, and a few had predicted capacity for sulfur lithotrophy and possible autotrophy (Chromatiales, Rhodospirillales, and Donghicola). Future comparisons of these data with those from other low-DO systems will illuminate common functional features associated with hypoxia and provide information about biogeographic distinctions among taxa associated with these regimes
Summary
Marine systems suffering from declines in dissolved oxygen (DO) are becoming more numerous across the globe [1]. Metabolic reconstruction and carbohydrate-active enzyme (CAZyme) prediction were completed as described (see reference 3 and Table S1 at https://doi.org/10 .6084/m9.figshare.6911729.v1).
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