The delineation of a service-providing unit (SPU) will vary depending on
the ecosystem service being considered, and any temporal or spatial
variation inherent in the species of interest and the service itself. For
example, the entire population of a given tree speciesmight provide the
global service of carbon sequestration. Regional populations of the
same tree species might provide a water filtration service that benefits
local communities (whereas populations in other regions might not).