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This book is a printed edition of the Special Issue "Understanding and Managing Emerald Ash Borer Impacts on Ash Forests" that was published in Forests
Abstract : Invasive emerald ash borer (EAB) (Agrilus planipennis Fairmaire) poses an imminent threat to the structure and function of North American hardwood forests, particularly black ash (Fraxinus nigra Marshall), and alters the hydrologic and ecological services of their wetlands. Black ash trees regularly grow in seasonally saturated soils and are responsible for hydrologic regulation and nutrient cycling. In this study, a gradient of black ash wetlands impacted by EAB were monitored to assess vegetation changes and near-surface soil nitrogen availability. Vegetation community changes were intertwined with nitrogen cycle disturbances following EAB infestation. As black ash died and fell to the wetland, more total organic nitrogen was returned to the environment and promptly incorporated into the growing shrub and sapling layers. Assessing vegetation and biogeochemical changes along an EAB gradient in the environment improves our understanding of the ecological ramifications for a future landscape without black ash wetlands as they presently exist.
This volume is an account of the scientific and social responses made to the discovery of an invasive forest insect -- the emerald ash borer or EAB (Agrilus planipennis Fairmaire, 1888) -- in North America, that was formally announced in July 2002. Since its recognition, this wood-boring beetle has become one of the most destructive and costly exotic species ever encountered. More than $300 million in federal USDA-APHIS funds (alone) have been devoted to battling this pest, which has killed some tens of millions of ash trees, chiefly within southeastern Michigan and surrounding states. EAB has now been found in 28 states and two Canadian provinces. But those numbers are almost certain to keep growing in coming years. While primarily a case study, this work nonetheless examines larger issues concerning invasive species as a whole, their inadvertent transport and worldwide spread through the rise of globalization, regulations that have been adopted to prevent their introduction, and the successes or failures of state and federal agencies to try and enforce those regulations. It offers the first general work of its kind to appear on the ash borer that is directed towards a broad audience including the public, entomologists and foresters, environmentalists and ecologists, researchers, regulators, and indeed anyone who wishes to learn more about this important and timely topic. No previous knowledge of EAB or invasion biology is assumed. This book covers all of the major aspects of scientific research and management that have occurred since EAB was recognized in 2002. It is thoroughly researched and draws from the best available data and sources, which represent (a) archival materials; (b) scholarly publications and conference proceedings; (c) interviews conducted with leading participants in the EAB program; (d) selected newspaper/magazine articles; and (e) reputable sources found on the Internet (e.g., USDA-APHIS).
Insect and disease issues are often specific to the Mediterranean forest systems rather than shared with the temperate forests. In addition to the specific native insects and diseases, the forests are subject to the invasion of exotic species. The forests are also at risk from high degrees of human activity, including changing patterns of forest fires, land management activities, intensive plantation forestry using introduced timber species from other Mediterranean climate zones, and atmospheric deposition. Combined with elements of global climate change that may disproportionately affect Mediterranean climate systems, this creates a number of significant management issues that are unique to the Mediterranean forests. It is our goal that the information contained in this volume will contribute to understanding the unique aspects of Mediterranean forest systems and to protecting these critical resources.