R. David Simpson Norman L. Christensen, Jr. Human Activity and Ecosystem Function: Reconciling Economics and Ecology Recognizing the need to improve social decision making on tradeoffs between economic growth and ecological health, the Renewable Natural Resources Foundation convened a workshop in October 1995 on "Human Activity and Ecosystem Function: Reconciling Economics and Ecology. " While the subtitle perhaps reflected unrealistic expectations, the presentations and discus sions at the workshop were a preliminary step toward that rec onciliation: bringing together ecologists, economists, other nat ural and social scientists, and policy makers to layout the issues, articulate their needs and perspectives, and identify common ground for further work. This volume contains the pa pers presented and reports generated from the workshop. We emphasize ecology and economics in this discussion. We could argue that organizing our inquiry around these diSCiplines is only natural. Ecology is the study of behavior of organisms within complex systems composed of a myriad of other organ isms and their physical environments. Increasingly, this disci pline has focused on how interactions among biological and physical components influence the overall functioning of ecosys tems. These components are increasingly being determined by viii Ecosystem Function and Human Activities human activities. Economics is the study of how we decide which of our needs and wants we choose to satisfy given our limited re sources.

Conservation Biology for All provides cutting-edge but basic conservation science to a global readership. A series of authoritative chapters have been written by the top names in conservation biology with the principal aim of disseminating cutting-edge conservation knowledge as widely as possible. Important topics such as balancing conversion and human needs, climate change, conservation planning, designing and analyzing conservation research, ecosystem services, endangered species management, extinctions, fire, habitat loss, and invasive species are covered. Numerous textboxes describing additional relevant material or case studies are also included. The global biodiversity crisis is now unstoppable; what can be saved in the developing world will require an educated constituency in both the developing and developed world. Habitat loss is particularly acute in developing countries, which is of special concern because it tends to be these locations where the greatest species diversity and richest centres of endemism are to be found. Sadly, developing world conservation scientists have found it difficult to access an authoritative textbook, which is particularly ironic since it is these countries where the potential benefits of knowledge application are greatest. There is now an urgent need to educate the next generation of scientists in developing countries, so that they are in a better position to protect their natural resources.

Wetlands and grassland are important components of natural ecosystems, which have rich values in maintaining ecological balance, regional economy and human development. Wetlands can provide freshwater resources and food sources for human beings, purify the water environment and mitigate climate change. The grassland ecosystem has such ecological functions as windbreak, sand fixation, soil preservation, climate regulation, air purification, water conservation and so on, which are closely related to human survival and well-being. In recent years, climate change and human activities have caused a profound impact on the structure and function of wetland and grassland ecosystems, and the problems of decline in size and function have attracted extensive attention from researchers globally. However, there are still many uncertainties about the variety of wetland and grassland ecosystem composition, structure and dynamics, as well as how they respond and adapt to climate change and human activities.

Ecosystems and Human Well-Being is the first product of the Millennium Ecosystem Assessment, a four-year international work program designed to meet the needs of decisionmakers for scientific information on the links between ecosystem change and human well-being. The book offers an overview of the project, describing the conceptual framework that is being used, defining its scope, and providing a baseline of understanding that all participants need to move forward. The Millennium Assessment focuses on how humans have altered ecosystems, and how changes in ecosystem services have affected human well-being, how ecosystem changes may affect people in future decades, and what types of responses can be adopted at local, national, or global scales to improve ecosystem management and thereby contribute to human well-being and poverty alleviation. The program was launched by United National Secretary-General Kofi Annan in June 2001, and the primary assessment reports will be released by Island Press in 2005. Leading scientists from more than 100 nations are conducting the assessment, which can aid countries, regions, or companies by: providing a clear, scientific picture of the current sta

The diversity of marine life is being affected dramatically by fishery operations, chemical pollution and eutrophication, alteration of physical habitat, exotic species invasion, and effects of other human activities. Effective solutions will require an expanded understanding of the patterns and processes that control the diversity of life in the sea. Understanding Marine Biodiversity outlines the current state of our knowledge, and propose research agenda on marine biological diversity. This agenda represents a fundamental change in studying the oceanâ€"emphasizing regional research across a range of space and time scales, enhancing the interface between taxonomy and ecology, and linking oceanographic and ecological approaches. Highlighted with examples and brief case studies, this volume illustrates the depth and breadth of undescribed marine biodiversity, explores critical environmental issues, advocates the use of regionally defined model systems, and identifies a series of key biodiversity research questions. The authors examine the utility of various research approachesâ€"theory and modeling, retrospective analysis, integration of biotic and oceanographic surveysâ€"and review recent advances in molecular genetics, instrumentation, and sampling techniques applicable to the research agenda. Throughout the book the critical role of taxonomy is emphasized. Informative to the scientist and accessible to the policymaker, Understanding Marine Biodiversity will be of specific interest to marine biologists, ecologists, oceanographers, and research administrators, and to government agencies responsible for utilizing, managing, and protecting the oceans.

This book examines the development needs of protected areas with threatened ecological biodiversity to gain deeper understanding of the local perspective of protected area ecosystems. The study focuses on the case of Nech Sar National Park in Ethiopia, a protected area facing many development challenges due to human over-utilization of its resources and threats to wildlife. The conceptual framework developed by this research makes an academic contribution in the protection and sustainable development of national parks' natural capital, since it is designed to provide a systemic analysis of the problem by showing the extent and magnitude of human induced impacts on the natural capital of protected areas. In line with this, the application of the framework produces new and evidence-based findings which will help to improve the governance of protected areas as the research will provide park authorities with a practical tool in addressing the underlying causes of the degradation of national parks before the state of degradation of these resources reach its irreversible juncture. The book will help academicians and researchers to assess the state of biodiversity resources in protected areas using Nech Sar National Park as a representative example of a threatened area common throughout Africa, and will enable development practitioners and policy makers to devise appropriate strategies such as community participation in the governance of protected areas that could help to halt the degradation of resources in protected areas.

Ecosystem management has gained widespread visibility as an approach to the management of land to achieve sustainable natural resource use. Despite widespread interest in this emerging management paradigm, Ecosystems: Balancing Science with Management is the first book to directly propose approaches for implementing ecosystem management, give examples of viable tools, and discuss the potential implications of implementing an ecosystem approach. These ideas are framed in a historical context that examines the disjunction between ecological theory, environmental legislation and natural resources management.