Fig. 3.

Modulated reflection at 820 nm. Kinetics (induction curves) of modulated 820 nm reflection (MR) induced by a 300 s pulse of strong red actinic light (627 nm peak, 3500 μmol photons m⁻² s⁻¹) in Dionaea muscipula traps dark-adapted for 20 min, measured with M-PEA2 and plotted on a logarithmic time scale from 0 to 300 s. The modulated reflection signals are expressed by the MR/MR₀ ratio, where MR₀ is the value at the onset of the actinic illumination (taken at 0.7 ms, the first reliable MR measurement). (A) MR/MR₀ ratio of traps mechanically triggered to close measured within a time period of 24 h after trap closing. Green circles: t = 0 open traps before triggering. Filled downwards triangles: dark blue t = 1 min, light blue t = 20 min, purple t = 4 h, pink t = 9.5 h, red t = 24 h after trap closing. (B) MR/MR₀ ratio of traps fed with insect powder and triggered mechanically to close, measured within a time period of 96 h after trap closing. Filled green circles: t = 0 open traps before triggering. Filled squares: dark blue t = 1 min, light blue t = 20 min, purple t = 4 h, pink t = 9.5 h, red t = 24 h, orange t = 48 h, brown t = 72 h and black t = 96 h. Data shown are mean values based on eight individual measurements.