The various faces of transdisciplinarity in research on ecosystem services: Editorial to Special Issue.

• Transdisciplinary studies on ecosystem services (ES) are highly attractive for capturing relations between ecosystems and human well-being. • The papers reflect the increasingly interlaced nature of methods in the field of ES mapping and assessment. • Valuation of ES involves very different aspects and approaches and does not necessarily include monetisation. • Policymaking perspective varies due to different economic and socio-political conditions in diverse parts of the world. The transdisciplinarity lies at the core of the ecosystem services (ES) field and provides a unique opportunity to develop scientific foundations of the concept and foster the integration of nature's values into governance processes. The article introduces the Special Issue that focuses on research integrating ES's biophysical, socio-cultural and economic dimensions in a transdisciplinary approach. We consider a set of submitted papers under three horizontal issues: differences in the methods used, the concept of valuation and the specificity of policymaking. [ABSTRACT FROM AUTHOR]