Remarkable similarity of oxygen tolerance across marine taxa when standardized for temperature and body size

Species’ ranges are shifting in response to increasing temperature and decreasing oxygen in coastal oceans. Forecasting these shifts is limited by information on physiological oxygen thresholds and how they depend on temperature. Here, we adopt an ecophysiological metric, the metabolic index, and estimate its parameters from data collected on marine taxa using phylogenetic trait imputation. The metabolic index is the ratio of temperature-dependent rates of oxygen supply to basal oxygen demands. By applying a hierarchical phylogenetic model to a data set of 74 marine taxa that accounts for both taxonomic distance (from Linnean classification) and biases related to lab methods, we find that the critical oxygen pressure at a reference body size and temperature is remarkably consistent across taxa, ranging 2.9 to 4.9 kPa. In comparison, the estimated effect of temperature on the critical oxygen pressure was more variable among taxa.  These findings suggest that species-level differences in ..., Data were collected via literature review or provided directly from authors.  Data were extracted digitally from figures when necessary.  , , # Remarkable similarity of oxygen tolerance across marine taxa when standardized for temperature and body size

# Summary of the study

We used phylogenetic imputation on experimental data on taxonomically diverse marine taxa that related critical oxygen pressure (pO2crit) to temperature and body size. We found that once we accounted for differences in body size, temperatures, and the source paper, the data point to very similar oxygen partial pressures (generally between 3 - 5 kPa) at which oxygen demand exceeds supply.

# Overview of folders/files and their contents

The dryad repository contains the data used in analysis in the file \"allmidata.csv\". Each row is one experimental outcome, where columns indicate :

1. scientific.name: Genus species, updated January 2023; [https://www.marinespecies.org/index.php](https://www.marinespecies.org/index.php)
2. Temp: experimental temperature (degrees C)
3. W: individual (or mean individual) body size (grams)
4. Pcrit: estimated critical...