The socio-cultural values of ecosystem services in managed, semi-managed and low-managed urban blue spaces and their surroundings. A case study of Warsaw, Poland

Urban blue spaces provide important ecosystem services (ES), that support health and well-being of city residents. This study examined residents' perceptions of ES provided by managed, semi-managed and low-managed blue spaces and their surroundings in Warsaw, a city dominated by the River Vistula which flows through its centre and is partially unregulated. We conducted a geo-questionnaire, asking respondents to mark their favourite blue spaces and evaluate them for different ES benefits. The data were analysed using cluster, correlation and spatial analysis to identify patterns and synergies among perceived ES. The results revealed five distinct ES clusters, showing synergies among aesthetic, recreational and nature appreciation related values. Managed blue spaces, such as urban parks or promenades, were primarily associated with social bonding, while historical and neighbourhood parks are valued for providing an everyday connection to nature and biodiversity. Low- and semi-managed areas, including vast informal riversides, play an important role in recreation, relaxation, connection to nature, and social bonding. These areas provide similar benefits with minimal interventions, highlighting their potential as Informal Blue Spaces, integral part of urban blue-green infrastructure. The results add to the increasing evidence of the social value of blue spaces and demonstrate how diverse management and investment approaches can support complementary socio-cultural benefits in cities. • Cultural ecosystem services are most valued in Warsaw's blue spaces. • Synergy clusters highlight ecological, recreational, aesthetic and symbolic values. • Blue space types and management intensity shapes perceived benefits. • Informal Blue Spaces provide diverse benefits with low-cost management input. • Findings support integrating diverse blue spaces into urban planning and policy.