Figure 1.
Avian BMR increases with body mass, and is higher in migrants than non-migrants.
A Individual data points and partial regression fits for non-migrants (black, solid line) and migrants (open, dotted line). B average residuals (±s.e.) from the overall regression of log BMR on log body mass for non-migrants and migrants. Full dataset (N = 135).
Table 1.
Correlation matrix of environmental variables and species traits in the analysis.
Table 2.
Environment has strong effects on avian BMR, above and beyond migratory tendency.
Table 3.
Differences in environmental associations of migrants and non-migrants.
Table 4.
Environmental correlates of BMR across migrants (a) and non-migrants (b) accounting for M and Pass/non-P.
Table 5.
Combined effects of select environmental variables on BMR in migrants and non-migrants.
Figure 2.
Partial residual plots of core environmental correlates of BMR for the combined dataset of both migrant (black circles) and non-migrant birds (open circles).
Each panel shows the effect of a single predictor on BMR controlled for body size and Pass/non-p membership. Regression lines are those significant for combined non-migrant – migrant data (Table 2). Negative residual outlier (<−0.4 partial residual value) is the group-living Green Woodhoopoe (Phoeniculus purpureus).