This book takes the place of "Biology of Seagrasses: A Treatise on the Biology of Seagrasses with Special Reference to the Australian Region", co-edited by A.W.D. Larkum, A.J. MaCComb and S.A. Shepherd and published by Elsevier in 1989. The first book has been influential, but it is now 25 years since it was published and seagrass studies have progressed and developed considerably since then. The design of the current book follows in the steps of the first book. There are chapters on taxonomy, floral biology, biogeography and regional studies. The regional studies emphasize the importance of Australia having over half of the world's 62 species, including some ten species published for Australia since the previous book. There are a number of chapters on ecology and biogeography; fish biology and fisheries and dugong biology are prominent chapters. Physiological aspects again play an important part, including new knowledge on the role of hydrogen sulphide in sediments and on photosynthetic processes. Climate change, pollution and environmental degradation this time gain an even more important part of the book. Decline of seagrasses around Australia are also discussed in detail in several chapters. Since the first book was published two new areas have received special attention: blue carbon and genomic studies. Seagrasses are now known to be a very important player in the formation of blue carbon, i.e. carbon that has a long turnover time in soils and sediments. Alongside salt marshes and mangroves, seagrasses are now recognized as playing a very important role in the formation of blue carbon. And because Australia has such an abundance and variety of seagrasses, their role in blue carbon production and turnover is of great importance. The first whole genomes of seagrasses are now available and Australia has played an important role here. It appears that seagrasses have several different suites of genes as compared with other (land) plants and even in comparison with freshwater hydrophytes. This difference is leading to important molecular biological studies where the new knowledge will be important to the understanding and conservation of seagrass ecosystems in Australia. Thus by reason of its natural abundance of diverse seagrasses and a sophisticated seagrass research community in Australia it is possible to produce a book which will be attractive to marine biologists, coastal scientists and conservationists from many countries around the world.

From 1965-1968, I held an Agricultural Research Council Research Fellowship at Christ's College, Cambridge. Later in 1981, when I was a Visiting Fellow in the Department of Biochemistry, University of Cambridge and renewed my contacts with Christ's College, my friend and colleague David Coombe, a Fellow of Christ's College, informed me that a collection of letters of Charles Darwin had just been - covered in the Library storeroom, underneath the College. I had always maintained an interest in Charles Darwin, from the early age of thirteen, when I had rst read his books, with I might say some dif culty! This collection was the 155 letters of Charles Darwin to his second cousin William Darwin Fox, which had been given in trust to the College, in 1909, by members of the Fox family at the time of the Darwin Centenary celebrations. I was allowed access to these 155 letters and at that time made my own tr- scriptions. It seemed to me that this was a magni cent account of the lives of two naturalists of the nineteenth century, starting at the time that they were at Christ's together, in 1828, and going to 1880 when W D Fox died - just two years short of the death of Charles Darwin in 1882. Of course this valuable resource had not gone unnoticed before. Darwin's son, Francis Darwin had been given the letters in the 1880s, when he was preparing his Life and Letters of Charles Darwin in 3 volumes.

This book takes the place of "Biology of Seagrasses: A Treatise on the Biology of Seagrasses with Special Reference to the Australian Region", co-edited by A.W.D. Larkum, A.J. MaCComb and S.A. Shepherd and published by Elsevier in 1989. The first book has been influential, but it is now 25 years since it was published and seagrass studies have progressed and developed considerably since then. The design of the current book follows in the steps of the first book. There are chapters on taxonomy, floral biology, biogeography and regional studies. The regional studies emphasize the importance of Australia having over half of the world's 62 species, including some ten species published for Australia since the previous book. There are a number of chapters on ecology and biogeography; fish biology and fisheries and dugong biology are prominent chapters. Physiological aspects again play an important part, including new knowledge on the role of hydrogen sulphide in sediments and on photosynthetic processes. Climate change, pollution and environmental degradation this time gain an even more important part of the book. Decline of seagrasses around Australia are also discussed in detail in several chapters. Since the first book was published two new areas have received special attention: blue carbon and genomic studies. Seagrasses are now known to be a very important player in the formation of blue carbon, i.e. carbon that has a long turnover time in soils and sediments. Alongside salt marshes and mangroves, seagrasses are now recognized as playing a very important role in the formation of blue carbon. And because Australia has such an abundance and variety of seagrasses, their role in blue carbon production and turnover is of great importance. The first whole genomes of seagrasses are now available and Australia has played an important role here. It appears that seagrasses have several different suites of genes as compared with other (land) plants and even in comparison with freshwater hydrophytes. This difference is leading to important molecular biological studies where the new knowledge will be important to the understanding and conservation of seagrass ecosystems in Australia. Thus by reason of its natural abundance of diverse seagrasses and a sophisticated seagrass research community in Australia it is possible to produce a book which will be attractive to marine biologists, coastal scientists and conservationists from many countries around the world.

From 1965-1968, I held an Agricultural Research Council Research Fellowship at Christ's College, Cambridge. Later in 1981, when I was a Visiting Fellow in the Department of Biochemistry, University of Cambridge and renewed my contacts with Christ's College, my friend and colleague David Coombe, a Fellow of Christ's College, informed me that a collection of letters of Charles Darwin had just been - covered in the Library storeroom, underneath the College. I had always maintained an interest in Charles Darwin, from the early age of thirteen, when I had rst read his books, with I might say some dif culty! This collection was the 155 letters of Charles Darwin to his second cousin William Darwin Fox, which had been given in trust to the College, in 1909, by members of the Fox family at the time of the Darwin Centenary celebrations. I was allowed access to these 155 letters and at that time made my own tr- scriptions. It seemed to me that this was a magni cent account of the lives of two naturalists of the nineteenth century, starting at the time that they were at Christ's together, in 1828, and going to 1880 when W D Fox died - just two years short of the death of Charles Darwin in 1882. Of course this valuable resource had not gone unnoticed before. Darwin's son, Francis Darwin had been given the letters in the 1880s, when he was preparing his Life and Letters of Charles Darwin in 3 volumes.

Seagrasses are unique plants; the only group of flowering plants to recolonise the sea. They occur on every continental margin, except Antarctica, and form ecosystems which have important roles in fisheries, fish nursery grounds, prawn fisheries, habitat diversity and sediment stabilisation. Over the last two decades there has been an explosion of research and information on all aspects of seagrass biology. However the compilation of all this work into one book has not been attempted previously. In this book experts in 26 areas of seagrass biology present their work in chapters which are state-of the-art and designed to be useful to students and researchers alike. The book not only focuses on what has been discovered but what exciting areas are left to discover. The book is divided into sections on taxonomy, anatomy, reproduction, ecology, physiology, fisheries, management, conservation and landscape ecology. It is destined to become the chosen text on seagrasses for any marine biology course."