Drumming signals of Danish Plecoptera

Abstract
The drumming signals of 4 species of Plecoptera collected in Denmark are reported. Danish Capnia bifrons drum about 15 times longer and more slowly than specimens from the Taunus Mountains, central Germany (d= 1.4 sec, as compared to 0.09 sec; f=6 and 80 knocks/sec, respectively). The drumming signals of Danish Isoperla grammatica differ only in duration (d = 0.5 sec.) from signals of German specimens (d = 1.0 sec). Drumming of Amphinemura sulcicollis was analyzed for the first time. Its signal is divided into two compounds lasting 0.1 and 0.4 sec, respectively. Frequency decreases from 49 to 31 knocks/sec. At 20°C, Taeniopteryx nebulosa drums for 1.6 sec, with a frequency of 5.5 knocks/sec. However, their drumming pattern varies largely with temperature.

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