Process-based models are effective in addressing spatially explicit dispersal of invasive species based on life mechanisms including birth, death, movement and response to environmental factors. An invading alien species, the western conifer seed bug (Leptoglossus occidentalis), spreads rapidly in the Korean peninsula since 1988. Process-based models were developed to include the rules occurred in population dynamics of the western conifer seed bug population. Passive movements were additionally linked to the models to present local and global transportations due to sapling trades. Simulation results presented the rapid dispersal of the pest species, comparable to field data. Model parameters including the Alle effect threshold and contribution of global transportation were adjusted to reveal spatially-explicit advancement patters of the species. Utilization of process-based models is further discussed in monitoring and management of forest insect pests in field conditions.

Recently, as the possibility of unexpected outbreaks of alien insects has increased due to climate change such as global warming, the importance of early control through rapid and accurate spread of exotic forest pest and change prediction diagnosis is required. This study summarizes and reports the followings: the establishment of monitoring strategy for exotic insects by the investigation of species distribution range through field surveys and others, the development of new diagnostic technique through microstructures and life-cycle, the dispersal of exotic insects, and ecological impact assessment using ecological methods and with the expansion of exotic insects and development of ecosystem impact prediction model.

Recently, in relation to climate change, many studies have been conducted to predict the potential habitat area and distribution range of tilapia and the suitability of habitat for each species. Most tilapia are tropical fish that cannot survive at water temperatures below 10 to 12°C, although some tilapia can survive at 6 to 8°C. This study predicted habitable areas and the possibility of spreading of habitat ranges of tilapia (Oreochromis niloticus and Oreochromis aureus) known to inhabit domestic streams. Due to climate change, it was found that habitats in the Geum River, Mangyeong River, Dongjin River, Seomjin River, Taehwa River, Hyeongsan River, and the flowing in East Sea were possible by 2050. In addition, it was confirmed that tilapia could inhabit the preferred lentic ecosystem such as Tamjin Lake, Naju Lake, Juam Lake, Sangsa Lake, Jinyang Lake, Junam Reservoir, and Hoedong Reservoir. In particular, in the case of tilapia, which lives in tributaries of the Geumho River, Dalseo Stream, and the Nakdong River, its range of habitat is expected to expand to the middle and lower of the Nakdong River system. Therefore, it is judged that it is necessary to prepare physical and institutional management measures to prevent the spread of the local population where tilapia currently inhabits and to prevent introduction to new habitats.

피망 작물에서 점박이응애 및 칠레이리응애의 수직 분포 및 확산 정도를 알아보고, 주간 브릿지를 이용한 칠레이리응애의 확산을 조사하였다. 이들의 확산은 점박이응애의 접종 밀도 및 위치에 따라 달랐다. 점박이응애를 상위엽에 주당 10 마리 접종하였을 경우 방사 5일까지도 하위엽보다는 상위엽에 머무는 경향을 보였으며, 주당 100 마리를 접종했을 때 이미 방사 1일차에 하위엽까지 이동하였다. 반면에 하위엽에 주당 10 마리 접종 후 1일차에 중·상위엽으로 이동하였고, 3일차는 상위엽에만 존재하였다. 주당 100 마리를 접종한 경우 접종 1일차에 상위엽까지 이동하였으며 시간이 경과함에 따라 하위엽보다는 상위엽에 더 많이 분포하는 경향을 보였다. 점박이응애를 접종한 이후 칠레이리응애의 접종 위치에 따라 이들이 확산되는 정도를 조사한 결과, 점박이응애가 없을 경우 칠레이리응애를 하위엽에 방사하여도 상위엽으로 이동하였고, 상위엽에 방사하면 방사 후 3일까지 는 상위엽에 머물러 있었다. 점박이응애가 있을 경우 칠레이리응애는 방사 이후 먹이가 있는 곳으로 이동하는 경향을 보였다. 피망 세개 주를 상부 또는 하부에 실로 연결하고, 2, 3번 작물에 점박이응애를 접종한 후 1번 작물의 상·하위엽에 각각 칠레이리응애를 방사하였을 경우 연결된 실을 통해 이웃 작물로 이동하였다. 따라서 방사되는 칠레이리응애의 확산을 증진하기 위해서 가능하다면 작물체 간격을 좁혀주거나 작물체를 인위적으로 연결하여 준다면 더 넓은 지역으로 확산 가능하여 방사된 칠레이리응애에 의한 점박이응애 방제효과도 크게 증진될 수 있을 것으로 판단된다.