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  • Tags / Keywords merremia peltata
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Will climate change impact the potential distribution of a native vine (Merremia peltata) which is behaving invasively in the Pacific region?
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Kumar, Lalit

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Taylor, Subhashni

2016
Merremia peltata is a species with uncertain status in the island nations of the Pacific region. It has been designated introduced and invasive in some countries whereas it is considered native in others. Recent increase in its abundance across some island landscapes have led to calls for its designation as an invasive species of environmental concern with biological control being suggested as a control strategy. Climate change will add to the complications of managing this species since changes in climate will influence its range limits. In this study, we develop a process-oriented niche model of M. peltata using CLIMEX to investigate the impacts of climate change on its potential distribution. Information on the climatic requirements of M. peltata and its current geographic distribution were used to calibrate the model. The results indicate that under current climate, 273,132 km2 of the land area in the region is climatically unsuitable or marginal for M. peltata whereas 664,524 km2 is suitable to highly suitable. Under current climate, areas of climatic suitability for M. peltata were identified on the archipelagos of Fiji, Papua New Guinea, Solomon Islands and Vanuatu. By the end of the century, some archipelagos like Fiji, Hawaii, New Caledonia and Vanuatu will probably become more suitable while PNG and Solomon Islands become less suitable for M. peltata. The results can be used to inform biosecurity planning, management and conservation strategies on islands.
Samoan Environment Forum: proceedings of the 2003 National Environment Forum|Fe'ese'esea'iga i aiga ma nuu o Samoa : aafiaga o le tofa i Tuana'i ma Saanapu / Tu'u'u Ieti Taulealo|Some prospects for managing Merremia peltata / William Stuart Kirkham|The Green turtle tour project : a successful approach to aiding natural resources management in Samoa / Funealii Lumaava Sooa'emalelagi & Steve Brown|Persistent Organic Pollutants and persistent toxic substances in Samoa's Environment / Taule'ale'ausumai Laavasa Malua, Bill Cable & Paul F. Heveldt|Bridging the gap: building environment information linkages & network - a Pacific Samoan model / Satui Bentin & Leilani Duffy|The MNRE model for institutional strengthening in the public sector / Tu'u'u Ieti Taule'alo & Moilevao Elisaia Talouli|SPREP in Samoa / F. Vitolio Lui|Samoa: a paradise lost? / Le Mamea Sefulu Ioane|Taking of customary land for the new Salelologa township / Patea M. Setefano, Vaitogi I Vaitogi, Faanimo Warren & Fiona Sapatu|A study of indigenous knowledge and its role to sustainable agriculture in Samoa / Pitakia Tikai & Aaron Kama|PABITRA (Samoa): promoting capacity building via biodiversity studies by young Samoans / Nat Tuivavalagi
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MNRE

2004
Merremia peltata, disturbance ecology, tropical cyclones and Samoa. The biology and ecology of Merremia peltata are not well understood. While some regard the species as an exotic invader of Pacific Island ecosystems (Meyer. 2000). others identify the plant as a native species likely to be harmful to native ecosystems (Whistler, 1995a. 2002) or as either native or ancient Polynesian introduction behaving invasively (Space and Flynn.(2002). In Samoa, this species occurs up to an elevation of around 300 meters (Whistler 1995a). and thus only affects lowland ecosystems. This species increases its distribution and abundance in two ways, either vegetatively. by sprawling into neighboring areas and rooting from its nodes or by seeds, although early research in the Solomons observed a low seed viability rate, and creeping may thus be its primary means of reproduction (Bacon. 1982). M. peltata has apparently been in the Pacific for hundreds of years (Whistler, pers. com.) but has only become invasive in the years following tropical cyclones Ofa (1990) and Val (1991) according to comments from local government officials. Disturbance thus appears to be an ecological contributing factor to this invasion.