Isoperla muir, Szczytko & Stewart, Muir Creek, 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 muir .

Two hundred thirty-two and two signals were obtained from eight and one, 1–4 day old males and female, respectively, at 24°C and 62 FTC. Males and the female produced 2-way sequenced duets with no female interspersed answers. The eight males called with signals of 9 mode beats (10.5 ± 2.0) with intervals of 48.1 ± 3.2 ms ( Figs. 2A–B , Table 1 ). Their average individual intervals were variable and gradually increased from 46.5 ms (i1) to 56.4 ms (i16) ( Table 2). These intervals (i2, i4, i6, i10, i12) decreased slightly from their previous intervals, but overall fit into the gradually increasing pattern. Range and mean number of beats per female answer signal were 6–7 and 6.5 ± 0.7; mean beat interval was 62.8 ± 7.8 ms. The time interval between the last male call beat and the first female answer beat (♂ - ♀ exchange interval) was 131.6 ± 21.3 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.