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A long term study of life cycle and population dynamics of folsomia octoculata insecta collembola in a pine forest soil



A long term study of life cycle and population dynamics of folsomia octoculata insecta collembola in a pine forest soil



Researches on Population Ecology (Tokyo) 26(1): 188-219



The life cycle and population dynamics of F. octoculata Handschin were studied over 12 yr in pine forest soil in Kyoto, Japan. The species has a multivoltine life cycle with a growth period from April-Nov. and overwinters from Dec.-March. During the growth period adults showed an iteroparous reproduction mode characterized by cyclic changes between sexually mature and immature states. During overwintering the adults were sexually immature. Birth and death rates showed a seasonal pattern, peaking in summer. Stable age distribution was obtained during the 1971 and 1974 growth periods. Population growth was estimated using a stable age model. The low growth rates obtained were explained by the high mortality rate in the soil habitat. Seasonal abundance differed among the years and wide seasonal fluctuations in numbers were shown in the population during years with a summer drought. Winter population levels were relatively stable. Whether the population was near or below the carrying capacity was studied by examining population abundance in relation to habitat availability throughout a seasonal cycle. This was an equilibrium species in habitat utilization. Population dynamic properties of this species were discussed in connection with life cycle and life history patterns and properties of soil habitat.

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Accession: 004581152

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