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R&D activities at Egis Environnement (a civil engineering-based environmental consultancy) facilitated the development of OptiFlux, a spatial analysis tool designed to predict and visualize the effects of implementing a linear infrastructure upon wildlife habitats. It also tests the relevance of positioning fauna passages to ensure the restoration of habitat connectivity and therefore allows the optimization of the number and location of potential fauna passages. OptiFlux makes use of habitat quality maps which correlated with ecological requirements of each studied species. The concept is based on the evaluation of the spatial distribution of wildlife in their natural habitats. It also allows the evaluation of the impact of a project that modifies landscape structures and contributes to territory fragmentation. OptiFlux is a project optimization instrument which helps in the decisionmaking process. Major applications are:•Identification of routes with the least impact on wildlife population fluxes and their habitats,•Optimization of the number and location of fauna passages for the benefit of wildlife and reduction of the conflict points between infrastructures (road, highway, railway) and ecological networks,•Simulation of the positive effects of the proposed fauna passages or biotopes (amphibian ponds, for example) for a better choice of installations and for a better reconnection of the fragmented habitats

OptiFlux: when biological and spatial data are crossed to reduce effects of linear infrastructure on wildlife