Experiment Traits Description
Courtship Reaction to female Time [s] until focal resident moved toward a female
Dive display Number of alighting of a resident male on the water surface (a common courtship display in Calopteryx sp.)
Engagement
A nominal value describing a male devotion to courtship: 100%: male attempts to form a tandem, dives on water, patrols a territory, chases away intruders, does not fly aside (does not leave his territory during the experimental period), does not perch (does not stop flying during the experiment); 75%: male patrols a territory, chases away intruders, does not fly aside, does not perch 50%: male patrols territory, chases away intruders, flies aside, perches; 25%: no patrolling, no chasing, flights aside, perching during the experimental trial
Aggressiveness Reaction to intruder Time [s] until focal resident moved toward the presented intruder male
Bites How many times a resident male bit the intruder
Hits How many times a resident male hit the intruder
Boldness
Distance to react
Binomial distance value: Near - male escaped when the bird decoy was closer than 0.5m Far – male escaped when the bird decoy was more than 0.5m away
Escape distance Distance [m; with an accuracy of 0.5m] the focal resident male flew after the predatory attack simulation
Time to return Time [s] passed until the resident returned to his territory after the predatory attack. The maximum time the observer waited for the male to come back was 180 s