Conservation planning for riverine biodiversity under changing climate: use of models

Overview

Floodplain habitat has undergone substantial degradation due to anthropogenic modification, with conservation implications intensified by climatic change. This research integrates species distribution modelling and hydrological forecasting to evaluate conservation adequacy and inform restoration planning for floodplain biodiversity, with particular emphasis on sessile organisms across spatial scales from reach to catchment.

Methods and approach

The investigation employs species distribution models constructed from national and international species occurrence databases combined with environmental predictor variables to project shifts in spatial distributions of floodplain organisms. Hydrological modelling at reach scale was applied to simulate temporal changes in water availability and habitat suitability, particularly during drought periods. Case study analysis of a 30-year protected floodplain site assessed the conservation outcomes for specialised terrestrial species. Multi-scale assessment incorporated catchment-level planning frameworks alongside reach-scale hydrological analysis.

Results

Species distribution models for Swiss floodplain organisms indicate that existing protected floodplain areas provide insufficient habitat and refugia for typical floodplain specialist species. Model outputs distinguish between persistent refugia and temporary sanctuaries through temporal habitat projections. Hydrological modelling of the Rhine reach in Germany demonstrates that water availability fluctuations, particularly during drought periods, will drive contraction of habitat suitability for floodplain plant communities at local scales. The protected floodplain case study demonstrates that long-term protection (30 years) successfully promotes floodplain biodiversity conservation in fragmented landscapes, providing refuge for specialised terrestrial species.

Implications

Current conservation designations require expansion and climate-adaptive modification to maintain adequate habitat provision for floodplain species under altered climatic conditions. Spatial prioritisation of restoration interventions must integrate catchment-scale planning to ensure landscape-level connectivity and resource allocation efficiency. Future restoration projects require concurrent consideration of reach-scale hydrological regimes and catchment-scale habitat distribution to address climatic changes affecting sessile species, which lack dispersal capacity to track shifting suitable habitat distributions.