Hummingbird blood traits track oxygen availability across space and time
J. L. Williamson, E. B. Linck, E. Bautista, A. Smiley, J. A. McGuire, R. Dudley, C. C. Witt
The paper examines blood traits in Andean hummingbirds across elevation gradients, finding that elevation effects on hemoglobin and hematocrit are consistent across species and individuals, but mechanisms of adjustment vary with elevation.
bioRxiv · Jan 18, 2022Evolutionary Biology