The hierarchical, unidirectional structures of dendritic stream networks regulate dispersal among half-isolated populations．Therefore, dynamics and persistence of local populations in most aquatic organisms are generally regarded as having been influenced by spatial structure such as geometry and size of habitat. However, it is expected to be difficult to extract these influences in organisms living at areas with high vulnerability to anthropogenic destruction such as headwater streams.

In this study,we attempted to predict current metapopulation(MP) or distribution by use of parameter representing pre-destruction MP at stenothermal Lefua echigonia that was once common species in hilly headwater streams in the Tama river basin.

We used an information-theoretic approach to select the best models from sets GLM (logit link, binomial error) that linked patch quality and spatial structure.

Results indicated that the most plausible models were dominated by altered reach,channel length,distance to nearest patch(pre-destruction MP),patch area and nearest patch×patch area, whereas width/depth and distance to nearest occupied patch(current MP) was of minor importance.

In conclusion, parameter representing pre-destruction MP was found to be useful for better understanding of current MP in area affected by serious anthropogenic destruction.