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Invasive Ornamental Palms in Tropical Islands, With PALMS Meyer et al.: Invasive Palms Vol. 52(2) 2008 JEAN-YVES MEYER Délégation à la Recherche Time Bombs in B.P. 20981 Papeete, Tahiti Gardens: Invasive French Polynesia jean- Ornamental [email protected] Palms in Tropical CHRISTOPHE LAVERGNE Association Palmeraie- Islands, with Union Domaine de Palmahoutoff Emphasis on 97432 Ravine des Cabris La Réunion French Polynesia France (Pacific Ocean) AND and the DONALD R. HODEL University of California Mascarenes P.O. Box 22255 Los Angeles, California (Indian Ocean) 90022 USA Although palms are much beloved handsome and striking components of tropical and subtropical gardens and landscapes, some species, like many other ornamental plants, are invasive and can pose a threat to native ecosystems if they escape cultivation. Invasive alien species are recognized to be one Pamplemousses in the island of Mauritius in of the major causes of biodiversity loss. Because 1729 or the Cinchona Botanical Garden in of their long-term evolution in complete Jamaica in 1868, have constituted major entry isolation, island biota are particularly points for a large number of non-native plants, vulnerable to foreign biological invasions. some of which became invasive (for example Humans have intentionally introduced a the tree Litsea glutinosa and the vine Hiptage majority of plant invaders as garden benghalensis in Mauritius or the tree Pittosporum ornamentals. Public or private botanic gardens, undulatum in Jamaica). Gardens still represent some of them established for many centuries continual sources of potential (or incipient) in the tropics, for example the Jardin des invasive plants. PALMS 52(2): 23–35 71 PALMS Meyer et al.: Invasive Palms Vol. 52(2) 2008 Some plant families are recognized as being literature survey and personal communi- “weedy” because they contain a high number cations of botanists, gardeners and palm of invasive species. Invasive legume trees collectors. We focused on French Polynesia, (Fabaceae), such as Leucaena leucocephala, especially the island of Tahiti (Society Islands), Acacia spp. or Prosopis spp., were widely and the Mascarenes, especially La Réunion and planted for forestry and/or soil improvement Mauritius islands. Potential (or incipient) in the past, and weedy grasses (Poaceae), such invasive palm species that might present a risk as Melinis minutiflora, were intentionally of becoming invasive in the near future are introduced as fodder or are accidentally also noted. introduced as contaminants. With the increase Major documented invasive palms of the ornamental plant trade and the recent development of the landscape industry (the Twelve palm species are recognized as invasive “green industry”), new “invasive families” are in tropical regions and islands (Tab. 1), emerging. For instance, several Acanthaceae meaning they are well established in the wild species, which are popular garden plants away from the original introduction sites, form because of their showy and colorful flowers dense clumps or stands excluding the native and bracts, are now being reported as invasive vegetation and spread in primary (or native) in Indo-Pacific tropical islands (Meyer and or in secondary (or disturbed) forests. Lavergne 2004). The palm family (Arecaceae) The African oil palm (Elaeis guineensis) is has been regarded as under-represented in spreading on Pohnpei (Federate States of terms of the relative number of invasive Micronesia) particularly on drier sites (Space & species. Indeed, there are only a few species (ca. Falanruw 1999). 12) which are reported to be widely naturalized The Chinese fan palm or fountain palm or invasive in tropical islands or countries (Tab. (Livistona chinensis) is considered invasive in 1). Bermuda (Kairo et al. 2003) and in Mauritius The objective of this paper is to inform private and La Réunion Islands (Moore & Guého 1984, and public botanical gardens, palm collectors Strahm 1993, 1999). It is naturalized in Florida and hobbyists, horticulturists, gardeners and (www.fleppc.org/list/05List.htm), in Hawaii landscapers of the risk of invasion posed by (Wagner et al. 1990, 1999) where it spreads in some introduced ornamental palms. Svenning ditches, stream beds, wet gulches and shady (2002), who focused only on naturalized palms understory of disturbed secondary forests (Starr in a secondary tropical forest in Panama, raised et al. 2003a) and on the east coast of New the issue that popular palms have the potential Caledonia in riparian forest (MacKey 1985). to become problematic invasive species and The California fan palm (Washingtonia filifera) recommended that a world-wide list of is considered invasive in Hawaii (Starr et al. invasive, non-native species be compiled. 2003b) and Australia in the Perth area (Hussey Herein, we listed the main naturalized and et al. 2007, Richardson et al. 2006), while the invasive species in tropical or subtropical Mexican fan palm (W. robusta) is cited as countries and islands based on our personal invasive in Hawaii (Starr et al. 2003b) and knowledge and field-observations, extensive Florida (www.fleppc.org/list/05List. htm). 1. Increase of the number of palm species introduced to Mauritius (Mascarenes, Indian Ocean) and Tahiti (French Polynesia, Pacific Ocean) during the last two centuries (after Baas Becking 1950, Jacquier 1960 and Nadeaud plant database, version 1992, for Tahiti, Rouillard & Guého 1981-1985, 1999 for Mauritius). 72 PALMS Table 1. The major documented invasive or widely naturalized palms in tropical islands and countries. Scientific name Origin Invaded Region Sources Archontophoenix alexandrae Queensland(Australia) Hawaii (Pacific Is.) Wagner et al. 1990, 1999 Archontophoenix cunninghamiana Eastern Australia Brazil www.institutohorus.org.br/download/fichas/ Archontophoenix_cunninghamiana.htm Areca triandra India, SE Asia Panama Svenning 2002 Elaeis guineensis West Africa Pohnpei (Pacific Is.), Space & Falanruw 1999, www.issg.org/database/species/ Brazil www.hear.org/pier/species/elaeis_guineensis.htm Heterospathe elata Philippines Guam (Pacific Is.) Jones 1995, Space & Falanruw 1999 www.hear.org/pier/reports/mreport.htm Livistona chinensis Japan, Taiwan, La Réunion (Indian Moore & Guého 1984, MacKey 1985, Strahm Ryukyu Is. Ocean Is.), Hawaii, New 1993, 1999, Kairo et al. 2003, Starr et al. 2003a Meyer etal.: Caledonia (Pacific Is.), www.hear.org/starr/hiplants/reports/html/ Florida (USA), Bermuda livistona_chinensis.htm (Caribbean Is.) http://plants.usda.gov/java/profile?symbol=LICH3 Nypa fruticans SE Asia, India, Nigeria, Trinidad www.africanconservation.org/ncftemp/nipa.html Sri Lanka, (Caribbean Is.) Kairo et al. 2003 Invasive Palms 52(2)2008 Vol. Australia, Solomon Is., Ryukyu Is. Phoenix dactylifera North Africa & Fiji, New Caledonia Smith 1979, Fuller 1997, Lazarides et al. 1997, Middle East (Pacific Is.), Australia MacKee 1985, Watling 2005, Hussey et al. 2007 Ptychosperma macarthurii New Guinea, Fiji (Pacific Is.), Barbados Fuller 1997, Kairo et al. 2003, Australia (Caribbean Is.), Panama Svenning 2002, Watling 2005 Roystonea regia Cuba Panama Svenning 2002 Washingtonia filifera California, Arizona, Hawaii (Pacific Is.), Oppenheimer & Barlett 2002, Starr et al. 2003b, Mexico Florida, Australia Lazarides et al. 1997, Hussey et al. 2007 www.hear.org/Pier/species/washingtonia_filifera.htm www.hear.org/Pier/pdf/pohreports/washingtonia_spp.pdf Washingtonia robusta Mexico Hawaii (Pacific Is.), Oppenheimer & Barlett 2002, Starr et al. 2003b Florida (USA) www.hear.org/Pier/species/washingtonia_robusta.htm www.hear.org/Pier/pdf/pohreports/washingtonia_spp.pdf 73 PALMS Meyer et al.: Invasive Palms Vol. 52(2) 2008 2. Seedlings of Licuala grandis in the understory of lowland rainforest on the island of Tahaa, French Polynesia (photo: Jean-Yves Meyer). The Sagisi palm (Heterospathe elata), which was including submontane rain forest in Rio introduced to Guam between 1900 and 1920, Grande (www.institutohorus.org.br/download/ is spreading in ravines and slopes (Jones 1995, fichas/Archontophoenix_cunninghamiana.ht Space & Falanruw 1999). m). The MacArthur palm (Ptychosperma The Cuban royal palm (Roystonea regia) occurs macarthurii) and the date palm (Phoenix in high abundance in secondary forests of dactylifera) are widely naturalized in Fiji (Smith Panama, where it is well naturalized in swamp 1979, Watling 2005), the first species along or lakeside forests, and Areca trianda sometimes drainages, fence lines and vacant lots in urban completely dominates the understory of areas and the second forming large secondary forests there (Svenning 2002). populations of about 1000 adult trees in the The nipa or mangrove palm (Nypa fruticans) in Nadi area and surrounding cane fields (Fuller Nigeria, which was introduced from Singapore 1997). The MacArthur palm is also naturalized in 1906, is currently displacing the native in Panama (Svenning 2002), Singapore (Hsuan mangrove vegetation and impacting coastal Keng et al. 1998) and the islands of plant communities (www.africanconservation. Guadeloupe and Martinique in the Lesser org/ncftemp/nipa.html). This species is also Antilles (Delnatte 2003,) and is considered reported as naturalized in the island of invasive in Barbados (Kairo et al. 2003). The Trinidad (Kairo et al. 2003) and Panama. date palm, planted around settlements throughout the arid zone of Western Australia, Naturalized and Invasive Alien Palms in forms dense thickets by suckering and seeds French Polynesia (Pacific Ocean) spread by birds, affects water flow and displaces Beside the coconut
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