Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Effects of Climate-Changes on Patterns of Seasonal Changes in Bird Population in Rice Fields using a Prey-Predator Model

포식자-피식자 모델을 이용하여 기후변화가 논습지를 이용하는 조류 개체군 동태에 미치는 영향 예측

  • Lee, Who-Seung (Department of Biological Sciences, Universite du Quebec a Montreal)
  • 이후승 (퀘벡주립대학교 생물학과)
  • Received : 2013.08.28
  • Accepted : 2013.10.24
  • Published : 2013.12.31
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Abstract

BACKGROUND: It is well known that rice-fields can provide excellent foraging places for birds including seasonal migrants, wintering, and breeding and hence the high biodiversity of rice-fields may be expected. However, how environmental change including climate-changes on life-history and population dynamics in birds on rice-fields has not been fully understood. In order to investigate how climate-change affects population migratory patterns and migration timing, I modeled a population dynamics of birds in rice-fields over a whole year. METHODS AND RESULTS: I applied the Lotka-Volterra equation to model the population dynamics of birds that have been foraging/visiting rice-fields in Korea. The simple model involves the number of interspecific individuals and temperature, and the model parameters are periodic in time as the biological activities related to the migration, wintering and reproduction are seasonal. As results, firstly there was a positive relationship between the variation of seasonal population sizes and temperature change. Secondly, the reduced lengths of season were negatively related to the population size. Overall, the effects of the difference of lengths of season on seasonal population dynamics were higher than the effects of seasonal temperature change. CONCLUSION(S): Climate change can alter population dynamics of birds in rice-fields and hence the variation may affect the fitness, such as reproduction, survival and migration. The unstable balances of population dynamics in birds using paddy rice field as affected by climate change can reduce the population growth and species diversity in rice fields. The results suggest that the agricultural production is partly affected by the unstable balance of population in birds using rice-fields.

본 연구는 수학적 모델(Lotka-Volterra 방정식)을 이용하여 기후변화가 논습지를 이용하는 조류 개체군의 크기와 구조에 미치는 영향에 대해 분석 및 예측하였다. 특히 논습지를 이용하는 조류 개체군 동태에 영향을 주는 기후변화에 대해, 1) 계절 내 최고 및 최저 기온의 변화와 2) 계절 길이의 변화를 조합하여 11가지 가능한 기후변화시나리오를 모델시뮬레이션에 이용하였다. 본 연구의 수학모델은 기온 변화, 즉 계절이 바뀜에 따라 월동, 이동, 그리고 번식조류가 일정한 시기에 그리고 일정한 분포패턴으로 논습지를 취식 및 서식지로 이용하고 있음을 보였다. 기후변화 시나리오의 결과, 기온변화의 폭이 커질 수록 조류 개체군 동태의 변이는 증가하였으며, 계절의 길이 변화, 특히 계절이 짧아진 경우에 논습지를 이용하는 기간도 크게 짧아져 전체적으로 개체군 동태를 감소시켰다. 전체적으로 한 계절 내의 기온변화가 발생하고, 다른 계절은 평년 기온을 유지할 경우에는, 해당 계절의 조류 개체군 동태만 기온변화에 영향을 받았다. 더욱이 계절의 길이 변화는 계절 내 기온 변화보다 더 뚜렷한 개체군 동태의 변화를 유도하였다.

Keywords

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