Isoperla tilasqua

Sandberg, John B. & Stewart, Kenneth W., 2006, Continued Studies Of Vibrational Communication (Drumming) Of North American Plecoptera, Illiesia 2 (1), pp. 1-14 : 6

Isoperla tilasqua .

Seventy-one and eight signals were obtained from one, 1-day old male and female, respectively, at room temperature and normal incandescent light near a window. The male and the female produced 2-way duets either with the female answer following the call (N=3) or with interspersed answer beats during the male’s 5 th (N=2) or 6 th (N=3) beat intervals. The male called with signals of 6 mode beats (6.1 ± 1.0); with intervals of 168.8 ± 8.3 ms ( Fig. 5 , Table 1 ). The male’s average individual intervals gradually decreased from 174.6 ms (i1) to 164.5 ms (i4) and then gradually increased to 169.9 ms (i7) ( Table 2). The beat count of female answer signals was always 1 and the ♂ - ♀ exchange interval was 118.2 ± 4.5 ms for sequenced and overlapped duets.

Figures

Figs. 1–6. 1. Soliperla campanula drumming. Bar = 100-msec, total duration (TD)= 257-msec; 2. Isoperla muir drumming. (A) Male call, TD = 482-msec, (B) 2-way duet, TD = 960-msec. Bars = 500-msec.; 3. Isoperla rainera drumming. (A) Male call, TD = 1172-msec, (B) 2-way duet, female answer to computer playback of male call, TD = 2150-msec. Bars = 500-msec; 4. Isoperla rougensis drumming. (A) 2-way duet with female interspersed answer, (B) Split-channel view reveals previously hidden female first answer beats, TD = 574-msec. Bars = 500-msec; 5. Isoperla tilasqua drumming: 2-way duet with female interspersed answer, TD = 849-msec. Bar = 500 msec; 6. Pteronarcys scotti drumming: 2-way duet with female interspersed answer, TD = 4725-msec. Bar = 1000-msec.