Eur. J. Entomol. 102 (4): 663-668, 2005

Circadian patterns in the activity of the Brazilian cave cricket Strinatia brevipennis (Ensifera: Phalangopsidae)

Sonia HOENEN
Departamento de Zoologia, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, trav. 14, n. 101, 05508-090, São

This paper presents data on the activity rhythms of the Brazilian cave cricket, Strinatia brevipennis. Recordings were made in the laboratory in a sound-proof constant environment. Recordings were made either under constant darkness or LD cycles, with food provided ad libitum or not, and with crickets isolated or with a conspecific near the cage. Some crickets were tested with pulses of sound. Raw data are presented in the form of single plot actograms and analyzed using the phase weighted stack (PWS) method. These cave crickets showed a somewhat erratic patterns of activity, although a circadian component could be detected. All the environmental variants tested (food availability, presence of conspecific and sound pulses) seemed to mask any activity rhythm indicating they are possibly important in determining the temporal organization of these crickets. Their activity patterns are discussed in terms of the plasticity of a cave animal's circadian system.

Keywords: Ensifera, Phalangopsidae, Strinatia brevipennis, cave crickets, circadian rhythms, masking, entrainment, plasticity

Received: October 19, 2004; Revised: June 27, 2005; Accepted: June 27, 2005; Published: November 3, 2005  Show citation

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HOENEN, S. (2005). Circadian patterns in the activity of the Brazilian cave cricket Strinatia brevipennis (Ensifera: Phalangopsidae). EJE, 102(4), 663-668
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