Abundances from the horizontal tows were separated into two groups for Mann-Whitney U statistical tests (P < 0.05 for significance): those from nets taken entirely at high oxygen and those from nets taken entirely at low oxygen (defined below) based on the continuous data from the MOCNESS oxygen sensor during the time of collection (table S2). High oxygen was defined as having at least some part of a net sample taken where oxygen was ≥8 μM (~0.54 kPa, 0.18 ml/liter) (i.e., there were at least some high values), while low oxygen was defined as having the maximum oxygen ≤5 μM (~0.34 kPa, 0.11 ml/liter) (i.e., all of a sample was taken at low oxygen). Because a single net spanned some time and distance (Fig. 2), it is unknown where exactly within its oxygen range animals may have occurred. Nets that bridged this range were not included for statistical purposes. The samples from the 425- and 430-m tows (tow #724 and #726) were combined for statistics, while the 800-m samples (tow #728) were separately tested because species composition changed substantially between these two depth zones. It should be noted that both of these oxygen limits, separated by only 3 μM (0.07 ml/liter), are well below most definitions of hypoxic water and OMZ oxygen limits (2, 3).

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