Mountain lakes are highly sensitive to global change, requiring sustainable management strategies that support crucial ecosystem services (ES). However, small mountain lakes are rarely in the focus of ES assessments, and indicators are potentially lacking. Therefore, this study aimed at comprehensively assessing key ES of 15 study lakes located in two regions in the European Alps. We involved local stakeholders and experts to identify important ES. We quantified eight ES in non-monetary terms, using 29 indicators based on limnological, spatial and socio-economic data. Finally, we evaluated ES in relation to the socio-ecological context of the study lakes. The most important ES included surface water for non-drinking purposes, maintaining populations and habitats, outdoor recreation, aesthetic value, entertainment and representation, scientific research, education as well as existence, option, or bequest value. Quantitative results indicate varying levels of ES across the study lakes. Based on 12 different socio-ecological variables, we identified four groups of lakes differing also in five ES. Maintaining populations and habitats, aesthetic value as well as existence, option or bequest value were rather independent from the socio-ecological context. Our findings contribute to a deeper understanding of ES of mountain lakes, also supporting the development of sustainable management strategies in mountain regions.

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Small alpine lakes are highly sensitive to global warming and human influence, which can affect the ecological integrity of these freshwaters. However, the response of lakes is variable and knowledge about potential impacts on related ecosystem services is insufficient. The project CLAIMES (Climate response of alpine lakes: Resistance variability and management consequences for ecosystem services) therefore aimed at assessing potential impacts on ecosystem services for 15 study lakes located in Niedere Tauern (Austria) and South Tyrol (Italy). In a first step, the lakes’ ecological variability was characterized based on limnological data and lake surface temperature modelling. Adopting a participatory approach, the most important ecosystem services were identified, and their importance was evaluated by local stakeholders. The prioritized ecosystem services were quantified using multiple indicators, and potential future impacts were assessed based on different possible worst-case scenarios. Our findings predict that global warming reduces ice cover duration affecting ecosystem functions and consequently the trophic state. Perceptions of local stakeholders were mostly consistent, but key ecosystem services depend on the regional context. Our results also indicate that the provision of ecosystem services by lakes is largely influenced by the local socio-ecological characteristics. The projected decline in ecosystem services in the future calls for better integration of alpine lake ecosystem services into decision- and policymaking across different governance levels.