Of the 4,000 species present in the agricultural zone over 1,500 occur low in the landscape, in riverine valleys, freshwater or primarily saline lands. Of these taxa 450 are endemic to the agricultural zone. These taxa are in danger of extinction as a consequence of rising saline groundwaters. Another 400-500 taxa are centred on the agricultural zone although not confined to it. These taxa are also under immediate threat of major genetic erosion from salination and hydrological changes.
Areas affected by secondary salination show major declines in vascular plant biodiversity.
Rich complex communities are replaced by a few succulents and weeds. Most lowland communities, including tall woodlands, Mallee and Melaleuca shrublands, freshwater and naturally saline wetlands will be lost unless remedial action is taken. The wheatbelt will lose much of its local landscape character. Approximately 200 sites have been established on private and local government lands by members of the WA Wildflower Society and results are being incorporated into the overall study. In summary, the wheatbelt is more biodiverse than previously realised.