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Introduced organisms. --- Alien organisms --- Alien species --- Exotic organisms --- Exotic species --- Foreign organisms (Introduced organisms) --- Foreign species (Introduced organisms) --- Introduced species --- Invaders (Organisms) --- Invasive alien species --- Invasive organisms --- Invasive species --- Naturalised organisms --- Naturalized organisms --- Non-indigenous organisms --- Non-indigenous species --- Non-native organisms --- Non-native species --- Nonindigenous organisms --- Nonindigenous species --- Nonnative organisms --- Nonnative species --- Translocated organisms --- Translocated species --- Organisms

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The young field of invasion biology - initially a branch of ecology and conservation biology - has greatly expanded, particularly in the last two and a half decades or so. As a result, the potential negative effects of introduced species have been widely advertised and sometimes, perhaps, overemphasized. This book attempts to restore some balance to the current debate over the role of non-native species, by offering a broader perspective, and taking a longer term, evolutionary look at these species and their impact in their new environments. The relatively arbitrary nature of terms such as 'native' and 'non-native', and the rather inconsistent ways in which such terms are applied to biological species, as well as the subjective boundaries of so-called 'native ranges' are analyzed. The role of non-native species in their new environments can be considerably more complex than the anti-introduced species information would often suggest. Thus, the more positive and nuanced perspective on introduced species and their impact offered in this book is much needed and long overdue.

Introduced organisms --- Alien organisms --- Alien species --- Exotic organisms --- Exotic species --- Foreign organisms (Introduced organisms) --- Foreign species (Introduced organisms) --- Introduced species --- Invaders (Organisms) --- Invasive alien species --- Invasive organisms --- Invasive species --- Naturalised organisms --- Naturalized organisms --- Non-indigenous organisms --- Non-indigenous species --- Non-native organisms --- Non-native species --- Nonindigenous organisms --- Nonindigenous species --- Nonnative organisms --- Nonnative species --- Translocated organisms --- Translocated species --- Organisms --- Environmental aspects.

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Both in Ethiopia and in the countries of East Africa, the continuing proliferation and spread of invasive alien species (IAS) is now recognized as a serious problem, which needs to be addressed. While this situation has improved dramatically over the past 10 years, further progress has been hampered by the absence, hitherto, of a comprehensive IAS database for the region. Countries in the region have repeatedly expressed the need for such a database, as a tool to assist in the identification of naturalized and invasive alien plant species, and in understanding their impacts, both existing and potential, while also providing pointers on what can be done to manage such species. This information is seen as essential, not only in enabling countries to develop effective IAS management strategies, but also in helping them to meet their obligations under various international agreements and treaties, including Article 8 (h) of the Convention on Biological Diversity (CBD) and Target 9 of the 2020 Aichi Biodiversity Targets. In providing such a database, this Guide is intended to give the countries of eastern Africa the information they require, in order to be able to develop effective strategies for combating the growing menace posed by invasive alien plants. It is further hoped that this Guide will foster increased regional collaboration, in responding to the challenges of managing shared invasive plant species. The Guide is based on the findings of extensive roadside surveys, carried out throughout the region, and on a review of the literature pertaining to naturalization and/or invasiveness among alien plants in eastern Africa. By this means, scores of exotic plant species were found to have escaped from cultivation, and to have established populations in the 'wild', to the detriment of natural resources and the millions of people in the region who depend on these resources. Included in the Guide are descriptions of roughly 200 exotic plant species which are either invasive already or which are deemed to have the potential to become invasive in the region. The profiled species include aquatic invasive plants or waterweeds (seven species); vines, creepers or climbers (20 species); terrestrial herbs, shrubs, and succulents (more than 30 species of each), and trees (more than 60 species). Also profiled in this Guide are many exotic plant species which, although their current distribution in the region may still be relatively localized, nevertheless have the potential to become considerably more widespread and problematic. The wide range of habitats and climatic conditions found within Ethiopia and across East Africa make the region as a whole particularly prone to invasions by a host of introduced plant species. Such invasions are being facilitated by increased land degradation, especially through overgrazing and deforestation, and also by climate change.

Plant introduction --- Introduction of plants --- Botany, Economic --- Phytogeography --- Alien plants --- Exotic plants --- Pest introduction --- invasives --- nonindigenous species --- climatic change --- weed control --- aquatic species --- data banks --- aquatic organisms --- exotic species --- weeds --- aquatic plants --- climate change --- invasive organisms --- eukaryotes --- databases --- introduced organisms --- nonindigenous organisms --- Africa --- Plants --- invasive species --- non-native species --- Africa South of Sahara --- invasive alien species --- exotic organisms --- subsaharan Africa --- alien invasive species --- introduced species --- East Africa --- aquatic weeds --- non-indigenous organisms --- non-indigenous species --- non-native organisms

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Biological invasions --- Introduced organisms --- Alien organisms --- Alien species --- Exotic organisms --- Exotic species --- Foreign organisms (Introduced organisms) --- Foreign species (Introduced organisms) --- Introduced species --- Invaders (Organisms) --- Invasive alien species --- Invasive organisms --- Invasive species --- Naturalised organisms --- Naturalized organisms --- Non-indigenous organisms --- Non-indigenous species --- Non-native organisms --- Non-native species --- Nonindigenous organisms --- Nonindigenous species --- Nonnative organisms --- Nonnative species --- Translocated organisms --- Translocated species --- Organisms --- Bio-invasions --- Bioinvasions --- Invasions, Biological --- Natural selection --- Population biology --- Environmental aspects. --- Control.

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Introduced organisms --- Biological invasions. --- Evolution. --- Bio-invasions --- Bioinvasions --- Invasions, Biological --- Natural selection --- Population biology --- Alien organisms --- Alien species --- Exotic organisms --- Exotic species --- Foreign organisms (Introduced organisms) --- Foreign species (Introduced organisms) --- Introduced species --- Invaders (Organisms) --- Invasive alien species --- Invasive organisms --- Invasive species --- Naturalised organisms --- Naturalized organisms --- Non-indigenous organisms --- Non-indigenous species --- Non-native organisms --- Non-native species --- Nonindigenous organisms --- Nonindigenous species --- Nonnative organisms --- Nonnative species --- Translocated organisms --- Translocated species --- Organisms