Eur. J. Entomol. 98 (4): 433-438, 2001 | DOI: 10.14411/eje.2001.063

Diel changes in adipokinetic response and walking activity of Pyrrhocoris apterus (Heteroptera) in relation to physiological status and wing dimorphism

Anna MAXOVÁ1,2, Dalibor KODRÍK1,2,*, Rostislav ZEMEK1, Radomír SOCHA1
1 Institute of Entomology, Academy of Sciences, Branišovská 31, České Budějovice, 370 05, Czech Republic
2 Faculty of Biological Sciences, University of South Bohemia, Branišovská 31, České Budějovice, 370 05, Czech Republic

Three experimental groups of adult females of Pyrrhocoris apterus (reproductive brachypterous, diapausing brachypterous, and macropterous with non-diapause type of reproductive arrest) were analysed for their dose dependency of adipokinetic response, sensitivity of the fat body to Pya-AKH and locomotor activity during a 24 hour cycle. The greatest adipokinetic response (lipid elevation after hormonal treatment) was observed in macropterous, lower in diapausing brachypterous and the lowest in reproductive brachypterous females. Macropterous females also exhibited the highest activity of walking, while the lowest locomotor activity was found in diapausing brachypters. Diel changes of adipokinetic response were recorded in all three experimental groups, with maximal response occurring during the day at 6-7 h after the onset of light. On the contrary, the minimal adipokinetic response was found in the night and early after the onset of light. No significant differences in diel rhythms were observed between groups exposed to various day lengths. Diel changes in locomotor activity were found only in reproductive brachypterous females and females of macropterous morph, and showed a diurnal rhythm with only one peak of activity during a 24 hour cycle. In the latter, the rhythmic pattern of walking activity was positively correlated with diel changes of adipokinetic response. This indicates an important role of Pya-AKH in dispersal strategy of macropterous females of this heteropteran.

Keywords: Pyrrhocoris apterus, Pya-AKH, adipokinetic response, walking activity, diurnal rhythm, diapause, wing polymorphism

Received: June 8, 2001; Revised: September 9, 2001; Accepted: October 23, 2001; Published: December 28, 2001  Show citation

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MAXOVÁ, A., KODRÍK, D., ZEMEK, R., & SOCHA, R. (2001). Diel changes in adipokinetic response and walking activity of Pyrrhocoris apterus (Heteroptera) in relation to physiological status and wing dimorphism. EJE, 98(4), 433-438. doi: 10.14411/eje.2001.063
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