Plot of the observed depth distributions of the nine indicator taxa identified based on the benthic visual surveys along with simultaneously collected depth profiles of Union, Dellwood, Unnamed (UN) 16 and 18 seamounts. The red background shows the mean oxygen concentration over the full time series, highlighting the OMZ (i.e., white is outside the OMZ). The dashed white lines delineate the region between 800 and 1,200 m which corresponds to oxygen <0.5 ml/L and dotted blue line indicates the mean depth of the calcite saturation horizon. A range of metrics on the species’ depth ranges are plotted (mean, horizontal black lines; ±1 standard deviation, dark gray boxes; maximum and minimum depth observed, thin dark gray lines). *The sea lily has a bimodal depth distribution (gap between 1,150 and 700 m); the black coral also has a bimodal distribution (dip between 900 and 850 m); the rest have roughly bell‐shaped unimodal distributions (except for the rockfish, which is truncated at the top) (S5). All taxa were found on all seamounts with habitat (seafloor) in their depth range (mean ± 1 standard deviation) with the exception of the bugle sponge which was not observed on UN 16. [190]