Reported choice assay outcomes: solitary NMRs spent more time in 3% O₂ than 21% O₂ (44.0±5.9 min vs 13.2±5.8; p=0.0001) and moved further (119.4±18.5 m vs 37.8±13.3; p=0.0006), indicating selection toward severe hypoxia rather than escape from it.
For paired animals, the preferred hypoxia level shifted to 7% O₂ (paired time-in-chambers: 18.0±2.5 min in 21% O₂ vs 29.1±2.7 min in 7% O₂; p=0.0045), while normoxia vs other hypoxia levels showed no clear preference.
Mechanistically, the authors argue social interaction increases activity and thus reduces tolerability of severe hypoxia; however, the provided text does not include direct metabolic/energetic measurements during choice, so causality remains inferred.
Supporting data are reported as available via Dryad Digital Repository (doi:10.5061/dryad.j9kd51crd).
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