Eur. J. Entomol. 104 (1): 23-31, 2007 | DOI: 10.14411/eje.2007.004

First demonstration of the influence of photoperiod on the thermal requirements for development in insects and in particular the linden-bug, Pyrrhocoris apterus (Heteroptera: Pyrrhocoridae)

Elena B. LOPATINA1, Sergei V. BALASHOV2, Vladilen E. KIPYATKOV2
1 Laboratory of Entomology, Biological Research Institute of St. Petersburg University, 2 Oranienbaumskoye shosse, Petergof, St. Petersburg, 198904, Russia; e-mail: elena.lopatina@gmail.com
2 Department of Entomology, Faculty of Biology and Soil Sciences, St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia

The influence of photoperiod on the thermal requirements for development was discovered for the first time in insects during experiments on the linden-bug, Pyrrhocoris apterus. The effect of photoperiod on the duration of linden-bug development at five constant temperatures (20, 22, 24, 26 and 28C) was measured and the thermal requirements for development at three photoperiods (14, 17 and 20 h light per day) were calculated. Bugs from four geographic populations were used in these experiments: Pyatigorsk (4402N, 4304E), Borisovka (5036N, 3601E), Mikhailov (5415N, 390E) and Ryazan (5436N, 3942E). From the values of individual development times at different temperatures the coefficient of linear regression of development rate (the inverse of the duration) on temperature and the thermal threshold for development were calculated. Both these parameters were found to decrease significantly with decrease in day-length for all four populations studied. It means that at shorter day-lengths nymphal development is less dependent on temperature compared to the development at longer day-lengths. These effects seem to be adaptive. The development times of nymphs at relatively high temperatures (above 24-25C) are shorter under long-days than under short days which should be advantageous at the height of summer when the days are long and the weather is warm. In the contrast, at relatively low temperatures (below 24-25C) the nymphs develop significantly faster under short-days than under long days, which is advantageous at the end of summer as it allows the nymphs to reach the adult stage, the only stage capable of overwintering. The influence of photoperiod on the thermal reaction norm appeared to be more or less gradual, i.e. the shorter the day-length the shallower the slope of the regression line of development rate on temperature and the lower the thermal threshold for development. An analysis of the literature shows that this effect of photoperiod on the thermal requirements for development is widespread among insects but has been overlooked by previous authors. The authors conclude that the variation in the development time observed in insects at different seasons, photoperiods or food regimes, or from different populations, etc., are generally due to some modification of the thermal reaction norms and more specifically to differences in the thermal requirements for development.

Keywords: Heteroptera, Pyrrhocoridae, Pyrrhocoris apterus, photoperiod, temperature, thermal reaction norms, thermal requirements for development, development time, development rate, thermal threshold, thermal lability, seasonal variation

Received: April 27, 2006; Accepted: September 27, 2006; Revised: September 27, 2006; Published: January 3, 2007Show citation

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LOPATINA, E.B., BALASHOV, S.V., & KIPYATKOV, V.E. (2007). First demonstration of the influence of photoperiod on the thermal requirements for development in insects and in particular the linden-bug, Pyrrhocoris apterus (Heteroptera: Pyrrhocoridae). Eur. J. Entomol.,104(1),23-31. doi:10.14411/eje.2007.004.
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