Author(s): Mitsuru Ohira; Shinji Fukuda
Linked Author(s): Shinji Fukuda
Keywords: No Keywords
Abstract: The designer flow paradigm, which aims to maximize biodiversity and the functions with artificial and managed flow environment, is needed for realistic goal in human-dominated landscapes. We examined contribution of hydraulic heterogeneities along fish species turnover for multi-species co-existence in a braided irrigation channel network. The difference of Froude number was effective for Simpson dissimilarity (index of species turnover) in intermediate level of flow discharge, whereas difference of cross-section area contributed to Simpson dissimilarity during lower flow level. These hydraulic heterogeneities would enhance fish species turnover with shifting more severe hydraulic elements, the functional properties of hydraulic environment were needed to consider not only their range of variation but also their timing in flow fluctuation.
Year: 2018