Eubliastes chlorodictyon

behaviour · bio.acousti.ca

(1 male recorded) The song of this species has been given in detail previously for a specimen from Ecuador (erroneously as Eubliastes ferrugineus, see above (Morris et al 1989: p. 225, Fig. 3E, F, G). A Song of this male is reproduced here (Fig. 33A). We recorded 4 songs of a male from Bajo Calima, Colombia (Fig. 33B), and since its call parameters departed somewhat from that of the Ecuadorean specimen an analysis is given below. The songs of the two insects agree reasonably well in carrier. The energy in the call is almost entirely ultrasonic with the quite symmetrical peak of the principal carrier at 25.4 kHz (29.1 kHz in the Ecuadorean specimen) (Fig. 33 CE). Diminishing harmonics of this 25 kHz fundamental, from a 2nd to a 5th, were evident in spectra, but the most intense of these, the 2nd, was 29 dB below the fundamental. The call incidence of the Colombian specimen at 23°C was determined with a stopwatch: songs were separated on average by 1.8 min (n = 13 successive calls) with the shortest call intervals 40-45s. The temperature was about the same as for the Ecuador male, 22°C, but that male called at intervals of -20 s, a much higher duty cycle. For both specimens there was a soft audible zip comprised of three prolonged (major) high-amplitude pulse trains (Fig. 33 A,B); along with these intense pulses are low intensity, lengthy complex wave trains, “pulses' with illdefined starts and stops. In songs of both males major pulse 'trains" may sometimes consist of but one prolonged pulse. But more often they show variably timed amplitude modulations. quite inconsistent in occurrence between calls of the same male, though there is a tendency to produce more lengthy prolonged pulses later in any given train. For the Colombian specimen pulse duration of the first two major trains was 4-7 ms with the final always longer at 9.7 ms. Measuring between major pulse train endings, the males differ in pulse train period. In the Ecuadorean male 18 ms separate the first and second trains and 12 ms the second and third. So there is a noticable temporal grouping of the last two trains. In the Colombian male 21 ms and 20 ms are the equivalent periods: the three trains are almost equally spaced. Call (zip) durations of the two males were comparable 62 ms (Ecuador) Vs 75 ms (Colombia) and the Ecuadorean insect also initiated its call with a major pulse/pulse train (Fig. 33A) instead of the low intensity (opening?) sound seen in the Colombian.

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