Fig. 2. Time course of agonistic behaviours (levels -2 to 5; see Materials and
methods), of urine release (UR) and of the activity of anterior appendages
(MX, maxilliped endopodites extended upwards; AF, antennule flicking; AD,
antennules pointing downwards) during a fight. Behaviour was recorded at 5 s
intervals. Only intervals in which animals fought and/or released urine are
shown. The ethograms of the eventual winner (upper trace) and the eventual
loser (lower trace) show four bouts of interactions. Positive agonistic levels
denote offensive behaviours; negative agonistic levels denote defensive
behaviours (see Table 1). Level
A denotes activity at some distance from the opponent. Level 0 denotes no
activity. The vertical broken line indicates lifting of the divider screen
that separated the animals.
