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Biological aspects of the life history of folsomia quadrioculata insecta collembola



Biological aspects of the life history of folsomia quadrioculata insecta collembola



Annales de la Societe Royale Zoologique de Belgique 107(1-2): 11-24



The genital area of F. quadrioculata was studied to estimate the sex ratio of the population. Its value is 1.22 females:1 male. Body length is also a useful criterion to study development in natural environments. Developmental time versus temperature follows a semilogarithmic relationship with a Q10 of about 3. Fecundity and survival vs. age were studied at 20.degree. C. Mean half-life amounted to 230 days with a longevity > 300 days. Ovipositions occur in 2 phases. During the 1st phase, ovipositions follow each other at an interval of 3 days. The reproduction rate per generation, expressed by female eggs/female egg is 25. The intrinsic rate of natural increase is such that the population multiplies by a factor 2 every 20 days.

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