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bioacoustics articles: Can. J. Zool., August 2003

Subject: bioacoustics articles: Can. J. Zool., August 2003
From: adam frankel <>
Date: Fri, 14 Nov 2003 15:33:01 -0800
complex calling song, Teleogryllus oceanicus (Orthoptera: Gryllidae)
 Sean E. Walker and William H. Cade 
 Can. J. Zool./Rev. Can. Zool. 81(8): 1414-1420 (2003) 
 Abstract: We examined the effects of temperature and age on calling song in
 the field cricket Teleogryllus oceanicus. Teleogryllus oceanicus has a
 complex calling song made up of two different kinds of chirp, long and
 short. The long chirp is made up of three to eight single pulses of sound
 and the short chirp consists of several paired pulses. The properties of T.
 oceanicus calling song did not vary with age, but almost every property of
 the song varied with temperature. Pulse duration, interpulse interval, and
 pulse rate in both the long and the short chirp varied with temperature. The
 number of pulses in the long chirp, number of chirps in the short chirp,
 chirp rate in the short chirp, duration of the long chirp, carrier frequency
 of both the short and long chirps, and total song duration were also
 affected by temperature. The duration of the short chirp and the degree of
 frequency modulation were the only characteristics that did not vary with
 temperature. Temperature does not affect the properties of the long and
 short chirps in the same manner. The long chirp decreases in duration with
 temperature and has fewer pulses, while the short chirp stays the same in
 duration and contains a higher number of chirps. These data demonstrate that
 temperature influences calling-song parameters in a field cricket with a
 complex calling song. 
 Endothermy and chorusing behaviour in the African platypleurine cicada Pycna
 semiclara (Germar, 1834) (Hemiptera: Cicadidae)
 Martin H. Villet, Allen F. Sanborn, and Polly K. Phillips 
 Can. J. Zool./Rev. Can. Zool. 81(8): 1437-1444 (2003) 
 Abstract: Cicadas use acoustic signals to find mates and therefore offer a
 phylogenetically independent opportunity to test the generality of ideas
 about acoustic communication that were developed from studies of other
 animals. Pycna semiclara (Germar, 1834) (Hemiptera: Cicadidae) is a
 forest-dwelling platypleurine cicada that uses its calling song to form
 choruses and attract mates. Additionally, P. semiclara produces an encounter
 call that is involved in courtship and also in spacing males within
 choruses. Males generally call from exposed trunks and branches within the
 understory but clear of the undergrowth and fight with other males that call
 within about 50 cm of them. Choruses sing sporadically throughout the day
 but focus most of their calling activity into half-hour bouts at dawn and
 dusk. Body size and ambient temperature had no significant effect on
 spectral or temporal characteristics of the calling song. Body temperature
 measurements indicate that P. semiclara thermoregulates endothermically,
 with a body temperature of more than 22 °C above ambient temperature being
 measured during calling activity at dusk. Such endothermy provides an
 advantage to the cicadas by allowing them to call during crepuscular hours
 when atmospheric conditions are most optimal for acoustic communication and
 predation risks are minimal. Coincidentally, endogenously regulating body
 temperature allows the temporal characteristics of the call to be unaffected
 by ambient temperature changes. 

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