Due to the increasing pressure on the environment from human activities, there is a growing need to understand the relationship between species and the environment. Therefore, this study constructs life cycle and niche from a geographic perspective, aiming to explain how existing spatial configurations affect the deterioration of coastal ecosystems. This research mainly adopts the method of literature analysis and field investigation, and then carries out four steps of reading, sorting, integration and analysis. In this study, the road kill data and living environment data of land crabs were integrated, and two results were obtained on the relationship between spatial conflict areas and land crab populations. The first is that the life cycle of land crabs is disturbed by TPH 26, thus confirming the spatial conflict hypothesis; the peak period of traffic flow at TPH 26 overlapped with the peak period of land crab larvae release, indicating that the spatial configuration of the reserve is not only a spatial conflict, but also a spatial-temporal conflict. Second, the land crab is an important indicator of coastal forests, and its niche also reflects geographic diversity, especially in features such as topographic structure, geological stability, and environmental humidity.

Coastal plant communities act as natural barriers to capture or intercept marine debris on the coast, thus reducing the risk of recurrent interior pollution. This study also examines whether these communities, known for capturing flying sand, can similarly intercept marine debris, reinforcing their role as natural barriers. Findings indicate that coastal plant communities more effectively capture Styrofoam debris, particularly particles ranging from 0.1 to 0.5 cm in size, commonly found in the Carex kobomugi community. The results of this study can inform coastal ecological restoration projects and guide the cultivation of plants on artificial coasts. Additionally, they offer insights into mitigating the detrimental effects of aesthetically displeasing marine litter on the tourism value of beaches.

本研究は，中型まき網漁，はえ縄漁，釣り漁の3つの漁船漁業における活動量当たりの漁船漁業用プラスチック製品の投入量原単位の推定を行った．各漁船漁業の漁業従事者から漁業用製品の購入データを入手して整理するとともに，その他必要な情報を漁業従事者へのヒアリング調査等によって入手し，ボトムアップ型の調査を行った．その結果，中型まき網漁のプラスチック製品投入量原単位は，漁獲高1t当たり6kg，はえ縄漁は186kg，釣り漁は36kgと推定された．プラスチック製品のうち，漁網，釣り糸，疑似餌等，海中で使用されるプラスチック製品では，中型まき網漁が漁獲高1t当たり2kg，はえ縄漁は94kg，釣り漁は7kgのプラスチック製品を投入していると推定された．