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Interpreting functional change is further complicated because higher or lower process rates do not inherently indicate recovery; their ecological meaning depends on how degraded and restored conditions compare with an appropriate reference state. We synthesised 582 effect sizes from 66 studies to quantify responses of nine ecosystem functions to hydromorphological restoration of streams and to assess whether changes in biological structure coincided with functional responses. Ecosystem\u2010function responses varied substantially among processes and baselines. Gross primary production was significantly higher in degraded than in reference streams, illustrating that elevated functional rates do not necessarily indicate reference\u2010like ecological conditions. Restoration did not consistently reverse degradation\u2010associated functional differences: denitrification was significantly lower in restored than in degraded streams, whereas nitrate uptake remained significantly lower in restored than in reference streams. Other restored\u2013reference differences were generally weak or uncertain. Functional responses did not differ systematically among broad restoration\u2010measure categories. Restoration age was associated with changes in gross primary production and denitrification relative to degraded conditions, but none of the functions showed detectable convergence towards or divergence from reference conditions through time. In studies measuring both biological structure and ecosystem functioning, biological responses to restoration were generally positive relative to degraded conditions, whereas functional responses were more variable. However, the available evidence was too uncertain to conclude that biological and functional responses systematically differed. Our synthesis shows that functional recovery cannot be inferred either from restoration\u2010associated change alone or from concurrent biological recovery. Assessing restoration success therefore requires direct measurements of ecosystem processes and ecologically meaningful reference conditions that reveal whether functional change represents movement towards a process\u2010specific restoration target.<\/jats:p>","DOI":"10.1111\/gcb.71126","type":"journal-article","created":{"date-parts":[[2026,10,22]],"date-time":"2026-10-22T08:01:13Z","timestamp":1792656073000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Hydromorphological Restoration of Streams Does Not Ensure the Recovery of Ecosystem Functioning"],"prefix":"10.1111","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-1085-5685","authenticated-orcid":false,"given":"Ulrike","family":"Haase","sequence":"first","affiliation":[{"name":"Institute of Hydrobiology Technische Universit\u00e4t Dresden  Dresden 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