Data collected from the evolved populations (predation selection) and courtship times under light and dark conditions
A higher ratio of night-time to daytime courtship in the predation than in the control populations.
Day == Day of trial
Phase == light or Dark; corresponds to Time (start time) of 8 am (dark, red light) or 11 am (light, room lighting)
Vial == Different recoreded vial of the day
Observer == two observers A and R
C_dur == Courtship duration in the session time (15 minutes or 900 seconds)
P_court == proportion of time courting in session time (C_dur/900)
Time == Start time
Session == Session of recording: block within the hour of recording (3 sessions of 15 minutes?) with 2 replicates of each population is recorded over 3 sessions
Trt == Predation selection treatment
Population == Replicate population
Option 1: dark / light activity as the dependent factor, GLMM with day (random), population (random within trt); fixed: trt. A priori contrast: higher dark / light activity in 2 predation trt than control.
Option 2: activity as the dependent factor, GLMM with day (random), population (random within trt); fixed: trt, session, trt x session. 2 predictions: overall lower activity in predation than control; sig. trt x session interaction owing to higher dark activity in predation trts.