 Biological inventory work; assessment of harvesting practices; and computer modeling of the dynamics of treefall, rot and harvest; have been carried out to adduce data on safe harvesting rates.Extensive research has also been conducted on the relation of brush clearance to biodiversity decline and impact on water tables; for example, these effects have been analyzed in the Toolibin Lake wetlands region.New Zealand has ratified the Convention on Biological Diversity and as part of The New Zealand Biodiversity Strategy and Biodiversity Action Plans are implemented on ten separate themes.