The distribution of selected localized alien plant species in Hawai'i Volcanoes National Park

Date
1992-01
Authors
Tunison, J Timothy
Whiteaker, Louis D.
Cuddihy, Linda W.
La Rosa, Anne M.
Kageler, Dina W.
Gates, Michael R.
Zimmer, Nicholas G.
Stemmermann, Lani
Journal Title
Journal ISSN
Volume Title
Publisher
Cooperative National Park Resources Studies Unit, University of Hawaii at Manoa, Department of Botany
Abstract
Prior to this study, the alien plant control program at Hawai'i Volcanoes National Park was hampered by the paucity and quality of alien plant distribution maps. A systematic program to map important localized alien plants was conducted 1983-1985 to determine the need and feasibility of controlling key alien plant species, establish a baseline for assessing the spread of these species, infer range expansions, locate all populations of a target species to assure thorough treatment, and assess the effectiveness of control programs. Thirty-six species were mapped, with emphasis given to localized alien plant species and those listed as target species in the 1982 Resources Management Plan (National Park Service 1982). The studies focused on Ainahou Ranch, Kilauea Crater, and the Coastal Lowlands west of the 1%9-1974 Mauna Ulu flows. The species distributions were mapped on topographic maps at 1:24,000, 1:12,000, or 1:6,000 scales, although most species are displayed in this report on smaller scale maps. In addition, species profiles are provided. These characterize importance to management, significance as a pest in native ecosystems, effective treatment methods, and history of management. There were two important findings from the distribution studies. Eleven species, previously not targeted for management, were identified from mapping efforts to be invasive and require control efforts. These are Formosan koa, slash pine, loquat, sisal, orange pittosporum, oleaster, English ivy, paperbark, blackwood acacia, kudzu, and guavasteen. The second finding is that five target species were found to be much more widespread than previously thought. These include silky oak, koa haole, fountain grass, Russian olive, and raspberry. This finding lead to an approach in which control efforts on widespread species were carried out only in intensive management units called Special Ecological Areas. Additional distribution mapping studies are recommended for widespread species.
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Citation
Tunison JT, Whiteaker LD, Cuddihy LW, La Rosa AM, Kageler DW, Gates MR, Zimmer NG, Stemmermann L. 1992. The distribution of selected localized alien plant species in Hawai'i Volcanoes National Park. Honolulu (HI): Cooperative National Park Resources Studies Unit, University of Hawaii at Manoa, Department of Botany. PCSU Technical Report, 84.
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