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Grebes are specialized waterbirds which inhabit marshlands and reed-fringed lakes. Their dependence on wetlands is total and as a result they are particularly vulnerable to changes in ecosystems and their deterioration. So adapted are they to the wetlands they inhabit that they are an ideal indicator of the health of wetlands and the changes taking place, changes often imperceptible to humans. Since c. 1970, two of the 22 recognized species of grebes have gone extinct and two others are in a critical situation. One of the greatest threats to their survival is loss of habitat. This action plan reviews the threats to grebes throughout the world and their current status and proposes a series of eight priority actions to ensure their survival.
Written by two of the leading explorers in the birdlife of the High Andes, this book sets new standards in this field. The book is illustrated by Jon Fjeldsaa, one of the World's most gifted bird artists, who again has proved his accuracy with the fine plumage details as well as masterly renditions of the general impression and shape. Almost one tenth of the World's nine thousand bird species are illustrated, many of them for the first time. Both males, females, young, and distinct subspecies are shown. The 64 beautifully composed colour plates depict over two thousand plumages. This is supplemented by several hundred line-drawings of the birds. Today this book is regarded as the "bible" in Andean birds and more than 4000 copies have been sold. Birds of the High Andes is published in co-operation with the Zoological Museum, Copenhagen, where one third of the retail price for the books is spent on further investigations in Andean birds. A colour prospectus is available upon request. 64 colour plates. Numerous line drawings. Distribution map to each species.
Based on the latest phylogenetic studies, this book reveals the remarkable new history of how passerines diversified and dispersed across the entire world.
High mountain habitats are globally important for biodiversity. At least 12% of birds worldwide breed at or above the treeline, many of which are endemic species or species of conservation concern. However, due to the challenges of studying mountain birds in difficult-to-access habitats, little is known about their status and trends. This book provides the first global review of the ecology, evolution, life history and conservation of high mountain birds, including comprehensive coverage of their key habitats across global mountain regions, assessments of diversity patterns along elevation gradients, and adaptations for life in the alpine zone. The main threats to mountain bird populations are also identified, including climate change, human land use and recreational activities. Written for ecologists and naturalists, this book identifies key knowledge gaps and clearly establishes the research priorities needed to increase our understanding of the ecology of mountain birds and to aid in their conservation.
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Synthesizing theoretical & empirical analyses of the processes that help shape these unique ecosystems, 'Tropical Rainforests' looks at the effects of evolutionary histories, past climate change, & ecological dynamics on the origin & maintenance of tropical rainforest communities.
Biodiversity, sometimes simply understood as "diversity of species", is a specific quality of life on our planet, the dimensions and importance of which have just lately been fully realized. Today we know that "biological diversity is a global asset of incalculable value to present and future generations" (Kofi Annan). Biodiversity is spread unequally over the world: in fact, the main share of biological resources worldwide is harboured predominantly by the so-called developing countries in the tropics and sub tropics. Therefore, Biodiversity - A Challenge for Development Research and Policy was chosen as the title for an international conference which was held in Bonn in 1997 as one of the ...