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Supporting data for "A novel landscape-scale habitat suitability framework reveals mechanisms of dam-induced extinction risk and restoration pathways"
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| Created: | Apr 23, 2026 at 2:51 p.m. (UTC) | |
| Last updated: | Apr 27, 2026 at 3:49 p.m. (UTC) | |
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| Sharing Status: | Public |
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Abstract
Despite the global degradation of riverine ecosystems due to dams and channelisation, the mechanisms by which habitat degradation disrupts species behavior remain unclear, hindering effective conservation efforts worldwide. Based on long-term monitoring data from 1999 to 2022, this study develops a novel landscape-scale habitat suitability framework that integrates geodetector-weighted hydrodynamic modeling with landscape connectivity metrics to identify key physical drivers and their interactive effects on species’ behavior. Applying to the last spawning grounds of the critically endangered Chinese sturgeon (Acipenser sinensis), the results reveal that hydrodynamic thresholds, particularly turbulence intensity (0.0181-0.0190 ), shear velocity (0.07-1.07 m/s) and water depth (13.47-18.75 m), are primary triggers of spawning magnitude. High turbulence intensity was identified as a critical stressor, preventing successful egg adhesion and increasing metabolic costs for broodstock. Interactions among these factors increased explanatory power from 20.6% to 45% compared to single factor. Moreover, the spatial configuration of suitable habitat patches, including area, fragmentation, and connectivity length, significantly influenced spawning behavior. We demonstrated how landscape-scale habitat suitability drove the shift in spawning locations from downstream to upstream, as well as the drastic decline in spawning magnitude over two decades, leading to the collapse of natural reproduction after 2012. Flow regulation (10,000-15,000 m³/s during thermal windows) and cobble restoration are proposed to rehabilitate spawning grounds for Chinese sturgeon.This work provides a transferable framework for diagnosing habitat degradation in dammed rivers. Beyond sturgeon conservation, the approach offers actionable thresholds for adaptive management of hydrologically altered freshwater ecosystems worldwide.
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