Abstract
Continental tropical ecosystems are generally viewed as less vulnerable to biological invasions than island ones. Their apparent resistance to invasive alien species is often attributed to their higher native biota diversity and complexity. However, with the increase of human activities and disturbances and the accelerate rate of introductions of plant species, these apparently resilient continental ecosystems are now experiencing alien plant naturalization and invasion events. In order to illustrate this emergent phenomenon, we compiled a list of all known introduced and naturalized plant species in French Guiana (Guiana Shield, South America). A total of 490 alien plants were recorded, about 34% of which are currently naturalized, mainly species belonging to the Acanthaceae and Fabaceae (Faboideae) in the Eudicotyledons, and Poaceae (grasses) and Arecaceae (palms) in the Monocotyledons. The coastal dry and wet savannas appears to be vulnerable to plant invasion (with 165 naturalized species, about 34% of the alien flora), especially by Acacia mangium (Mimosaceae) and Melaleuca quinquenervia (Myrtaceae) which are forming localized but dense monotypic stands. Both tree species, intentionnally introduced for reforestation, rehabilitation, and as garden ornamentals and have the potential to spread with increasing human disturbances The number and abundance of naturalized alien plants in the relatively undisturbed tropical lowland rainforests and savannas remains still very low. Therefore, surveillance, early detection, and eradication of potential plant invaders are crucial; moreover collaboration with neighbouring countries of the Guiana Shield is essential to prevent the introduction of potentially invasive species which are still not present in French Guiana.
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Acknowledgments
The first author is grateful to the following experts who helped to set up the species checklist and for their personal communications, J.-J. de Granville and Marie-Françoise Prévost (Institut de Recherche pour le Développement, Cayenne, French Guiana), P. O. Albano (Association Ti’Palm, Cayenne, French Guiana), and S. Guitet (Office National des Forêts, Cayenne, French Guiana). We thank Dr. J. W. Veldman, Dr. C. Daehler and one anonymous reviewer for their useful comments to improve the manuscript. We also thank K. Dever (Direction Régionale de l’Environnement, Cayenne, French Guiana) for the maps, and dear friends and colleagues L. Collado Santamaría, C. Girod, G. Leotard, and P. C. Zalamea-Zamora for their assistance in the field and with the checklist. We specially thank Christian Feuillet (Department of Botany, Smithsonian Institution, Washington) and for the critical and valuable comments on the draft.
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Delnatte, C., Meyer, JY. Plant introduction, naturalization, and invasion in French Guiana (South America). Biol Invasions 14, 915–927 (2012). https://doi.org/10.1007/s10530-011-0129-1
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DOI: https://doi.org/10.1007/s10530-011-0129-1