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The Convention on Biological Diversity aims to encourage and enable countries to conserve biological diversity, to use its components sustainably and to share benefits equitably. Species richness and endemism are two key attributes of biodiversity that reflect the complexity and uniqueness of natural ecosystems. National data on vertebrates and higher plants indicate global concentrations of biodiversity and can assist in defining priorities for action. Projections indicate that species and ecosystems will be at maximum risk from human activities during the next few decades. Prompt action by the world community can minimise the eventual loss of species. Highest priorities should be to: (i) strengthen the management of ecosystems containing a large proportion of global biodiversity; (ii) help developing countries complete their biodiversity strategies and action plans, monitor their own biodiversity, and establish and maintain adequate national systems of conservation areas; (iii) support actions at the global level, providing benefit to all countries in managing their own biodiversity. Generally, resources will best be spent in safeguarding ecosystems and habitats that are viable and important for global biodiversity, and which are threatened by factors that can be controlled cost-effectively. Other important criteria are representativeness, complementarity and insurance.

Sympatric gibbon species Hylobates lar and H. syndactylus were censused on a mountain in Malaya (West Malaysia). Habitat quality was assessed between 380- and 1,525-m altitudes. H. syndactylus was found to occur up to altitudes higher than does H. lar, and this is discussed with reference to the two species’ divergent foraging strategies indicated by previous research. It is suggested that gibbons are restricted in their altitudinal range by an increasingly unfavourable ratio of food consumed to energy expended in its location, caused by a reduced food-source density and more difficult terrain at higher elevations.

What are the challenges involved in protecting biodiversity in tropical terrestrial and coastal ecosystems? What practical lessons can be learned from conservation projects? And what are the procedures and attitudes of governments, NGOs, donor agencies, development banks and consulting firms? These key questions are all answered, drawing on the author's extensive experience of conservation projects in Malaysia, Nigeria, China, Indonesia, the Philippines and Costa Rica. Project descriptions illustrate two important themes in conservation: increasing the awareness of the economic value of biodiversity among decision makers and enabling and encouraging local people to participate in designing and implementing projects. The book sets out guidelines to help others design projects that are practical and effective, yet more complete and more robust than some of those designed in the recent past.

Releasing animals into the wild, especially when they have become extinct there, is an appealing and dramatic conservation technique. It is, however, fraught with risks and often expensive; its success depends upon meticulous planning. The authors discuss the reasons for translocation, the many problems involved and the special cases where such an exercise may be justified.