尼崎港人工干潟におけるアサリ定着を目指した順応的管理に関する実践的研究

抄録

We report a series of adaptive management approach to a tidal flat constructed in Port of Amagasaki. The management goal setting was to realize a tidal flat rich in bivalve Ruditapes philippinarum. Continuous monitoring after the construction revealed that the achievement of the initial goal was violated by the mat formation of Musculista senhousia. Less turbulence was suggested to cause the mat formation, from the analysis based on the field monitoring and numeric calculation. Therefore, as the countermeasure, structures promoting the turbulence were set up on the sediment surface. It succeeded in a decline of the abundance of M. senhousiaaround the structures. However, the number of Mytilus galloprovincialisthat favors hard substrate has increased around the structures, whereas the number of R. philippinarumwas not necessarily increased. Simultaneous use of other techniques such as mechanical agitation of sediment might be necessary to increase the number of R. philippinarumin the future.