河川－農業水路ネットワークにおける両側回遊型甲殻類の個体群存続可能性評価手法の開発

抄録

Conservation of river and agricultural channel networks is important for conserving local populations of aquatic species inhabiting agricultural areas. We conducted field investigations of the distribution of the amphidromous freshwater shrimp Caridina leucosticta in seven agricultural drainage channels around the Furu River, Aichi Prefecture, Japan. We developed a simulation model of the population viability analysis for this shrimp to assess its habitat network, which is composed of the river and agricultural channels, and we simulated patterns of shrimp migration into the channels. The distribution pattern simulated by our model was similar to the shrimp’s distribution as observed in the field, with many shrimp migrating into spring-fed channels. To simulate the distributional patterns of this shrimp more accurately, we need to improve our model by clarifying the factors affecting shrimp migration into agricultural channels.