This is the first ever European-wide overview of biodiversity in alpine areas. The volume draws together taxonomic, ecological, historical, functional and climatic studies to develop a holistic understanding of biodiversity at and above the treeline. The main themes are: plant, vegetation and animal diversity, altitude gradients and spatial patterns, long-term changes and the effects of herbivores on diversity. These themes are introduced by a geo-biological scene setting and by a novel characterisation of alpine bio-climate. The comparisons of current and long-term observations and data emphasise the historical tradition of alpine biodiversity research in Europe. Analyses of taxonomic and assembly data at the continent-wide scale provide insight into pattern and its historical and ecological causes.