Dryad Item 10.5061/DRYAD.2778N3G

• Main Authors: Göthe, Emma, Degerman, Erik, Sandin, Leonard, Segerseten, Joel, Tamario, Carl, McKie, Brendan G.
• Format: Dataset
• Language: unknown
• Published: Dryad Digital Repository 2019
• Subjects: Bypassed river channels; Lota lota; Traits; Anguilla anguilla; Regulated rivers; Salmo salar; Stressor interactions; hydropower; ELOHA; Salmo trutta; Rutilus rutilus; Mininum flow; Perca fluviatilis; Riparian degredation; Life sciences; medicine and health care; envir; geo; lota
• Online Access: https://doi.org/10.5061/dryad.2778n3g

River regulation for hydropower is undertaken worldwide, causing profound alterations to hydrological regimes and running water habitats. Regulated catchments are often subjected to additional stressors, arising inter alia from agriculture, forestry and industry, which are likely to interact with impacts of river regulation on fish and other biota. Such interactions are poorly understood, hindering planning of effective mitigation and restoration. We investigated fish responses to increased discharge (as a restoration measure) in regulated rivers in Sweden. We compiled electrofishing data from river channels downstream of hydropower dams, each of which either has or lacks a mandated minimum discharge corresponding to c. 5% of pre‐regulation discharge. We further analysed interactions between flow restoration and co‐occurring local and regional stressors. River channels without a mandated minimum discharge were characterised by a low diversity of fish species with traits favouring persistence under unpredictable environmental conditions, including omnivory, short life cycles and small size. Additional stressors further reduced diversity, and increased dominance by broad niched, opportunistic species. Both the presence and magnitude of a mandated minimum discharge were positively related to fish diversity and density, and the relative density of three economically and recreationally valuable species. However, the size of these relationships frequently varied with the presence of additional stressors. Increasing levels of hydrological degradation and reduced connectivity at the catchment scale reduced positive flow‐ecology relationships and hindered restoration of fish communities towards reference conditions. However, application of a mandated minimum discharge also assisted in mitigating impacts of some co‐occurring stressors, especially reduced riparian integrity. Synthesis and applications. Additional stressors can strongly influence the outcomes of flow restoration for fish community diversity and composition. ...