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Life Time Egg Production in Females of the Cricket Teleogryllus commodus WALKER 1869 (Insecta: Orthoptera): Experimental Results and Theoretical Predictions

A b s t r a c t : Egg-laying activity of female Teleogryllus commodus was studied at four different environmental temperatures, namely 20 °C, 23 °C, 25 °C, and 30 °C, whereby the number of eggs oviposited per day and the total number of eggs oviposited during adult life time were determined. For recognizing the eggs stored in the female ovaries at the different environmental conditions, also ovary weights of 5-day old and 10-day old females were measured and compared. As the main result number of oviposited eggs increases with growing environmental temperature, with females reared at 30 °C laying four to five times as many eggs as females reared at 20 °C. Duration of the oviposition period is also enhanced with temperature, because females start earlier with their oviposition and continue the egg-laying process to higher ages. Besides the number of eggs oviposited, also the number of eggs stored in the ovaries increases with environmental temperature, whereby ovary weight of 10-day old females kept at 30 °C was three to four times higher than ovary weight of respective females kept at 20 °C. In addition to the experimental results also a computer model, named CRICKTHERM, is presented, which allows the generation of total fecundity functions for different cricket species and the prediction of oviposition efficiencies after variation of different environmental factors such as temperature, humidity, photoperiod, and population density. As a preliminary result, respective predictions are presented for four environmental factors.