| http://www.w3.org/ns/prov#value | - Within a complex system, it is helpful to focus on separating ???fast??? and ???slow??? variables (see, e.g., Ludwig et al. 1978, Holling 1986, Carpenter and Turner 2000 for ecosystems; Cr??pin 2007 for social???ecological systems). ???Fast??? variables are typically those that are of primary concern to ecosystem users, for example a pest species or (often) ecosystem goods and services, such as cr
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