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Mountains have socio-economic and environmental importance for the entire world, and they are also one of the regions most threatened by global change. As mountains are systems in which the human and nature dimensions are tightly interconnected, studying them as social–ecological systems (SES) is increasingly common. To date, a variety of approaches and frameworks have been used to study mountain SES, making comparisons across mountain areas challenging. In this paper, we use Ostrom’s SES framework to review the mountain SES peer-reviewed literature under a common scope, aiming at unraveling which frameworks, approaches, domains, sectors, and elements are studied by researchers. Among the 169 reviewed manuscripts, only 28% of them employed a framework to study their system, and custom-made frameworks were preferred over existing ones. Although most research articles were in the domain of environmental sciences, socio-economic attributes were included more often than ecological ones, and more than 30% did not combine social and ecological information. Moreover, albeit most manuscripts had an empirical approach, field data were seldomly used. Future works should focus on collecting social and ecological data at comparable scales, as well as on developing tools to effectively integrate both dimensions in mountain SES studies. Finally, we examine components of mountain socio-ecological systems commonly addressed in literature, highlighting important elements for overall and sector-specific sustainability. Regarding social aspects, understanding local inhabitants’ diverse perspectives and socioeconomic context is crucial. In terms of ecological elements, describing climatic patterns and ecosystem history is key.

Mountains are social-ecological systems exposed to multiple climatic and socioeconomic drivers. The Pyrenees are a clear example of the concomitant challenges that these regions face, as they are exposed to stressors linked to depopulation, an economic shift towards tourism, and climate change. To understand how these multiple stressors affect the system’s resources, it is useful to study them from a social-ecological system (SES) perspective. Focusing on a Pyrenean SES, we use piecewise structural equation modeling and network analysis to quantitatively describe the interactions between water resources, biodiversity, and the social and economic elements of the system. Our results show that the current economic focus and dependency on tourism severely impact water resources and biodiversity. Future climatic scenarios forecast a worsening of the pressures on the hydrological system and may threaten winter tourism. Actions to alleviate the pressures on water and biodiversity and to increase socioeconomic resilience are a priority. We argue that such actions will have to include both a diversification of the region’s touristic offer and of the economy, coupled with a more sustainable use of water resources. Our findings highlight the importance of studying the interactions and causal relationships between SES elements. This can help gain a comprehensive understanding of how the SES functions and its sustainability challenges.