Egg production and development of the carabid beetles Notiophilus biguttatus F. and Notiophilus rufipes Curtis were studied in relation to temperature. Adult beetles and larvae were fed springtails of the species Orchesella cincta (Linné). The rate of egg production, at the different temperatures did not differ between the species. As observed in N. biguttatus egg production at a daily fluctuating temperature regime is high compared to egg production at the constant temperatures. Food supply not only has a strong effect on egg production but also on the relation of egg production with temperature, as shown in N. biguttatus. Development times in N. rufipes are longer than in N. biguttatus particularly at low temperatures. The temperature during development has a distinct effect on adult body size. As observed in N. biguttatus body size and fecundity show a strong positive correlation.

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