A MATHEMATICAL ANALYSIS ON EFFECT OF REPRODUCTIVE SCHEDULE PATTERN ON EXTINCTION PROBABILITY OF PERENNIAL PLANTS

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Theoretical study is conducted to evaluate the effects of variation in life history parameters on population growth rate. The effects in two riparian tree species are also evaluated, applying population matrix models. In Aesculus turbinate, key process and stage of population dynamics is identified as growth of juvenile individuals, by life table response experiment (LTRE). Furthermore, a simulation program, which is based on population matrix models and incorporated by landscape dynamics, is developed. We found in Aesculus turbinata, that the population cannot be maintained without mast behavior. On the other hand, in Pterocarya rhoifolia, it is maintained even if the frequency of masting is very low.