TableĀ 1.

Purple martin foraging trip durations by prey type and flight altitude. (a) ANCOVA results comparing durations of trips in which fire ants were captured with those targeting only other insects; (b) OLS regressions of duration versus altitude.

factord.f.Fp-value
(a) ANCOVA
trip durationmax height122.093<0.001
(queens)prey type16.8800.011
error68
trip durationmax height122.782<0.001
(queens and males)prey type19.2140.003
error68
duration versus max heightninterceptsloper2
(b) OLS regressions
S. invicta queens1577.573.060.55
other prey56146.495.690.25
S. invicta queens and males19139.752.500.30
other prey52110.096.470.40