This confirms our findings of high available
diversity. That study also reported that the number of approved
species for future public planting is only 29% of the species in
the existing inventory. If the goal of tree planting in the city is
biodiversity, this is troubling. However, it is likely that approved
species must satisfy concerns about water use, tree size, maintenance and other issues pertaining to feasibility and management
costs. These attributes are also important issues relevant to urban
biodiversity as tree mortality in urban areas is high, and there
are constrained municipal budgets for tree maintenance