Survey of localised kamahi (Weinmannia racemosa) dieback in Tongariro National Park
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CONSERVATION ADVISORY SCIENCE NOTES No. 20 AN ASSESSMENT OF THE CURRENT STATUS OF KAMAHI FOREST IN THE KAITAKE RANGE, EGMONT NATIONAL PARK (Short Answers in Conservation Science)
Results of a two-day reconnaissance survey of kamahi ( Weinmannia racemosa ) dieback on the Kaitake Range, Egmont National Park are reported using an earlier survey conducted in 1978 and 1979 as the baseline.
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Increased dieback in Westland rata (Metrosideros umbellata) kamahi (Weinmannia racemosa) forests has been linked to the build-up of populations of the Australian brush-tailed possum (Trichosurus vulpecula). Within these forests young even-aged stands are observed to be more resilient to dieback than older stands. The effect of possum browsing on individual rata trees was related to the level of...
متن کاملThe Effect of Control of Brushtail Possums (trichosurus Vulpecula) on Condition of a Southern Rata/kamahi (metrosideros Umbellata/weinmannia Racemosa) Forest Canopy in Westland, New Zealand
Brushtail possums began colonising a rata/kamahi forest in the Taramakau catchment, Westland, about 1950 and by 1973 had caused widespread conspicuous canopy defoliation. They were poisoned in one block of this forest in 1970, at about the time they reached peak density, and again in 1974. In an adjacent block they were poisoned in 1974 only. A survey of forest canopy condition in 1985 showed t...
متن کاملMagnitude of Canopy Dieback and Implications for Conservation of Southern Rata-kamahi (metrosideros Umbellata - Weinmannia Racemosa) Forests, Central Westland, New Zealand
The amount of conspicuous canopy dieback in all central Westland southern rata-kamahi forests east of the Alpine Fault, between 500 m altitude and treeline, was assessed and mapped from aerial photographs taken in 1984-85 and verified by aerial reconnaissance of selected areas in 1988. At least 20% of all canopy trees, predominantly southern rata (Metrosideros umbellata) and Hall's totara (Podo...
متن کاملThe Possum and Rata-Kamahi Dieback in New Zealand: A Review!
Browsing by the introduced Australian brush-tailed possum (Trichosurus vulpecula) has been generally accepted in New Zealand during the past 30 yr as the principal cause of damage to hardwood forests dominated by rata (Metrosideros spp.) and kamahi (Weinmannia racemosa). Recently, this view has been challenged, and assertions have been made that the forests in a North Island tract were in poor ...
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