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Wetlands are unique and fragile environments that provide a transition between aquatic and terrestrial habitats. Focusing on freshwater wetlands with emergent vegetation, this book considers productivity in relation to communities of animals and plants and their environments, mineral cycling, hydrology, and management. The contributors emphasize the biological interactions and processes underlying the structure and functioning of wetlands, revealing the need to appreciate the dynamics of the system to establish appropriate management and conservation practices. Based largely on research...

Until recently, black holes were often considered as exotic objects of dubious existence. In the last decade, observations have provided overwhelming evidence in favour of the presence of supermassive black holes at the centre of galaxies, including the Milky Way; of stellar-mass black holes in binary stellar systems; and, possibly, of intermediate-mass black holes in ultraluminous X-ray sources in nearby galaxies. Black holes are now widely accepted as real physical entities, playing an important role in modern astrophysics. IAU S238 brought together observers and theoreticians working in...