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Ecological studies of collembolan populations in a pine forest soil part 1 the life cycle and population dynamics of tetracanthella sylvatica



Ecological studies of collembolan populations in a pine forest soil part 1 the life cycle and population dynamics of tetracanthella sylvatica



Revue d'Ecologie et de Biologie du Sol 13(1): 117-132



Monthly sampling over a 4 yr period of pine forest soil provided information on the life cycle and population dynamics of T. sylvatica [Yosii]. The life cycle study revealed 1 generation/yr with growth occurring during autumn, winter and spring. Diapause occurred during the summer. The pattern of seasonal fluctuations in numbers was not different from year to year. An annual peak occurred in mid-winter. Oviposition occurred in the surface layer, and juveniles migrated into deeper soil layers during the spring and summer. This species had an aggregated distribution pattern based on mean crowding-mean regression analyses. Population dynamics were studied for 5 generations. The survivorship curve was represented by an exponential decrease in the number of juveniles during the autumn, winter and spring. Low mortality was noted during the summer. Numbers of adults and juveniles were relatively stable during the study period.

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