Development of an ecological mapping methodology for urban areas in New Zealand

At present there is no ecologically based mapping system designed for application to urban areas in New Zealand. New Zealand's ecological structure is particularly interesting as it combines indigenous habitats comprising significant numbers of endemic species with a vibrant imported ecology comprising habitats characteristic of their primarily European and Australian origins. In New Zealand, the focus to date in habitat mapping has been on developing vegetation mapping techniques for application to predominantly indigenous habitats in rural areas. Thus, they omit reference to the type of mixed exotic-indigenous vegetation associated with habitats common to urban areas, such as cliff faces, disused quarries, private gardens and grounds, river and rail corridors. A project was undertaken in conjunction with the Dunedin City Council to develop a habitat map of the city. The aim was to produce a map that would accommodate the diverse highly modified habitats characteristic of Dunedin and that would incorporate all types of urban open space ranging from indigenous habitats, such as forest to exotic habitats such as lawns, and residential gardens. The project developed a land use and habitat classification hierarchy applicable to the New Zealand urban context, including a classification system for private gardens. This paper describes the classification system that was developed, its benefits, limitations and application. The map is the first attempt to record all natural land uses, including gardens in any New Zealand city at a detailed level, i.e. at a scale of 1:3000. In all 1100 separate habitat parcels were mapped. The map revealed that whilst Dunedin is a city rich in natural vegetation very little of this is indigenous or even predominantly indigenous vegetation. A Geographic Information System was used to map the urban habitats and store the habitat data. The habitat map and associated data will be used by the council in developing an open space strategy for the city. (C) 2002 Elsevier Science B.V. All rights reserved.