Isoperla rainera, Jewett, W. Fork Salmon River, 2002

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

Isoperla rainera . Fifty-five and 32 signals were obtained from four and two, 1–5 day old males and females, respectively, at 24°C and 62 FTC. Males and females produced 2-way sequenced duets with no female interspersed answers. The four males called with signals of 13 mode beats (13.5 ± 2.0); with intervals of 94.0 ± 19.8 ms ( Figs. 3A–B , Table 1 ). Their average individual intervals within calls decreased from 138.7 ms (i1) to 76.2 (i16) ( Table 2). Mode and mean number of beats per female answer signal were 9 and 13.8 ± 6.4; mean beat interval was 58.3 ± 25.9 ms. The ♂ - ♀ exchange interval was 230.9 ± 95.2 ms.

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.