Baumgärtner, StefanQuaas, Martin F.2025-05-292005https://epflicht.bibliothek.uni-halle.de/handle/123456789/5216816517606urn:nbn:de:gbv:3:2-779592610467The ecological literature suggests that biodiversity reduces the variance of ecosystem services. Thus, conservative biodiversity management has an insurance value to risk-averse users of ecosystem services. We analyze a conceptual ecological-economic model in which such management measures generate a private benefit and, via ecosystem processes at higher hierarchical levels, a positive externality on other ecosystem users. We find that ecosystem management and environmental policy depend on the extent of uncertainty and risk-aversion as follows: (i) Individual effort to improve ecosystem quality unambiguously increases. The free-rider problem may decrease or increase, depending on the characteristics of the ecosystem and its management; in particular, (ii) the extent of optimal regulation may decrease or increase, depending on the relative size of private and external effects of management effort on biodiversity; and (iii) the welfare loss due to free-riding may decrease or increase, depending on how biodiversity influences ecosystem service provision; it increases, unless higher biodiversity greatly decreases the variance of ecosystem services.1 Online-Ressource (PDF-Datei: 42 S., 0,34 MB) : graph. Darst.enghttp://rightsstatements.org/vocab/InC/1.0/Umweltforschung333Book