Fig. 1
From: Reduced olfactory acuity in recently flightless insects suggests rapid regressive evolution
Odorant-evoked antennal responses are weaker in wing-reduced than in full-winged stoneflies. A Wing-reduced (green box) and full-winged (grey box) Zelandoperla fenestrata ecotypes. B Topographic map of the five sampling sites in New Zealand. C Antennal signal traces (mean ± SEM) for the five stonefly populations (grey: full-winged; green: wing-reduced). Number of antennae for wing-reduced/full winged stoneflies of the five populations (from left to right): 10/10, 24/23, 11/13, 11/14, 6/8. Signal traces of honey bee antennae 12 antennae) for scale and a photoionisation detector (PID) for visualizing the stimulus dynamics (10 recordings; PID signals for 2-butanone saturated and are not shown). Grey vertical bars indicate odorant valve opening time (300 ms). Horizontal dotted lines show 0 V