Leading ecologists discuss some of the most compelling open questions in the field today Unsolved Problems in Ecology brings together many of the world's leading ecologists to discuss the most fundamental research questions confronting the field today. This diverse and thought-provoking collection of essays spans virtually all of the key subfields of the discipline, from behavioral and evolutionary ecology to population biology, community ecology, ecosystem ecology, disease ecology, and conservation biology. These essays are intended to stoke curiosity, challenge prevailing wisdom, and provoke new ways of thinking about ecology in light of new technologies and unprecedented environmental challenges brought on by climate and land-use change. Authoritative and accessible, Unsolved Problems in Ecology is ideal for graduate students in the early stages of their scientific careers and an essential resource for seasoned ecologists looking for exciting new directions to take their research. Sheds light on modern ecology's most important and compelling open questions Features thought-provoking contributions from more than two dozen world-class ecologists Covers behavior, evolution, communities, ecosystems, resource management, and more Discusses ways to raise the financial and intellectual profile of the discipline An invaluable resource for graduate students as well as seasoned ecologists

Leading ecologists discuss some of the most compelling open questions in the field today Unsolved Problems in Ecology brings together many of the world's leading ecologists to discuss the most fundamental research questions confronting the field today. This diverse and thought-provoking collection of essays spans virtually all of the key subfields of the discipline, from behavioral and evolutionary ecology to population biology, community ecology, ecosystem ecology, disease ecology, and conservation biology. These essays are intended to stoke curiosity, challenge prevailing wisdom, and provoke new ways of thinking about ecology in light of new technologies and unprecedented environmental challenges brought on by climate and land-use change. Authoritative and accessible, Unsolved Problems in Ecology is ideal for graduate students in the early stages of their scientific careers and an essential resource for seasoned ecologists looking for exciting new directions to take their research. Sheds light on modern ecology's most important and compelling open questions Features thought-provoking contributions from more than two dozen world-class ecologists Covers behavior, evolution, communities, ecosystems, resource management, and more Discusses ways to raise the financial and intellectual profile of the discipline An invaluable resource for graduate students as well as seasoned ecologists

Although ecologists have long considered morphology and life history to be important determinants of the distribution, abundance, and dynamics of plants in nature, this book contains the first theory to predict explicitly both the evolution of plant traits and the effects of these traits on plant community structure and dynamics. David Tilman focuses on the universal requirement of terrestrial plants for both below-ground and above-ground resources. The physical separation of these resources means that plants face an unavoidable tradeoff. To obtain a higher proportion of one resource, a plant must allocate more of its growth to the structures involved in its acquisition, and thus necessarily obtain a lower proportion of another resource. Professor Tilman presents a simple theory that includes this constraint and tradeoff, and uses the theory to explore the evolution of plant life histories and morphologies along productivity and disturbance gradients.

The book shows that relative growth rate, which is predicted to be strongly influenced by a plant's proportional allocation to leaves, is a major determinant of the transient dynamics of competition. These dynamics may explain the differences between successions on poor versus rich soils and suggest that most field experiments performed to date have been of too short a duration to allow unambiguous interpretation of their results.

"Spatial Ecology" addresses the fundamental effects of space on the dynamics of individual species and on the structure, dynamics, diversity, and stability of multispecies communities. Although the ecological world is unavoidably spatial, there have been few attempts to determine how explicit considerations of space may alter the predictions of ecological models, or what insights it may give into the causes of broad-scale ecological patterns. As this book demonstrates, the spatial structure of a habitat can fundamentally alter both the qualitative and quantitative dynamics and outcomes of ecological processes.

"Spatial Ecology" highlights the importance of space to five topical areas: stability, patterns of diversity, invasions, coexistence, and pattern generation. It illustrates both the diversity of approaches used to study spatial ecology and the underlying similarities of these approaches. Over twenty contributors address issues ranging from the persistence of endangered species, to the maintenance of biodiversity, to the dynamics of hosts and their parasitoids, to disease dynamics, multispecies competition, population genetics, and fundamental processes relevant to all these cases. There have been many recent advances in our understanding of the influence of spatially explicit processes on individual species and on multispecies communities. This book synthesizes these advances, shows the limitations of traditional, non-spatial approaches, and offers a variety of new approaches to spatial ecology that should stimulate ecological research.

One of the central questions of ecology is why there are so many different kinds of plants and animals. Here David Tilman presents a theory of how organisms compete for resources and the way their competition promotes diversity. Developing Hutchinson's suggestion that the main cause of diversity is the feeding relations of species, this book builds a mechanistic, resource-based explanation of the structure and functioning of ecological communities. In a detailed analysis of the Park Grass Experiments at the Rothamsted Experimental Station in England, the author demonstrates that the dramatic results of these 120 years of experimentation are consistent with his theory, as are observations in many other natural communities. The consumer-resource approach of this book is applicable to both animal and plant communities, but the majority of Professor Tilman's discussion concentrates on the structure of plant communities. All theoretical arguments are developed graphically, and formal mathematics is kept to a minimum. The final chapters of the book provide some testable speculations about resources and animal communities and explore such problems as the evolution of "super species," the differences between plant and animal community diversity patterns, and the cause of plant succession.

Does biodiversity influence how ecosystems function? Might diversity loss affect the ability of ecosystems to deliver services of benefit to humankind? Ecosystems provide food, fuel, fiber, and drinkable water, regulate local and regional climate, and recycle needed nutrients, among other things. An ecosyste's ability to sustain functioning may depend on the number of species residing in the ecosystem--its biological diversity--but this has been a controversial hypothesis. There are many unanswered questions about how and why changes in biodiversity could alter ecosystem functioning. This volume, written by top researchers, synthesizes empirical studies on the relationship between biodiversity and ecosystem functioning and extends that knowledge using a novel and coordinated set of models and theoretical approaches.

These experimental and theoretical analyses demonstrate that functioning usually increases with biodiversity, but also reveals when and under what circumstances other relationships between biodiversity and ecosystem functioning might occur. It also accounts for apparent changes in diversity-functioning relationships that emerge over time in disturbed ecosystems, thereby addressing a major controversy in the field. The volume concludes with a blueprint for moving beyond small-scale studies to regional ones--a move of enormous significance for policy and conservation but one that will entail tackling some of the most fundamental challenges in ecology.

In addition to the editors, the contributors are Juan Armesto, Claudia Neuhauser, Andy Hector, Clarence Lehman, Peter Kareiva, Sharon Lawler, Peter Chesson, Teri Balser, Mary K. Firestone, Robert Holt, Michel Loreau, Johannes Knops, David Wedin, Peter Reich, Shahid Naeem, Bernhard Schmid, Jasmin Joshi, and Felix Schlapfer."

Originally published in 1990, continued requests for copies of Perspectives on Plant Competition by James B. Grace and David Tilman have demonstrated its utility to practitioners and especially to students. The dynamics and outcomes of plant interactions are of increasingly great interest and importance to ecologists and environmental biologists. Ever since the effects of global environmental change have emerged as a major issue, ecologists have increasingly focused their work on predicting the responses of natural systems to environmental changes. This has forced us to confront both the unknowns and the complexity of species interactions. Simply put, it is now clear that, without a better understanding of the mechanisms of plant interactions, we will not be able to predict the responses of communities and ecosystems to elevated nitrogen deposition, to changes in species composition and diversity, to elevated atmospheric CO2, to climate change, or to invasive exotic species. Work on plant interactions has continued unabated of course since the original printing of Perspectives on Plant Competition but the title is generally held to have had a positive effect on subsequent work on plant interactions, both by showcasing the variety of ways in which competition can be approached and by substantially reducing some of the confusion about issues that existed before its publication. It still has an important role to play in guiding future research on plant interactions. Perhaps an additional, continuing value is in the example it serves for the maturation of an important ecological topic. The lasting message of this book is that one cannot fully understand an idea without understanding the perspective upon which it is based, including the systems that have inspired the idea and the finer details of the research goals of those involved. Plant competition will continue to be a multifaceted topic. This book will continue to provide useful guidance for the further exploration of such interactions. "This is certainly a required book for those working on plant competition, and an important reference for ecologists and biologists in general. In many ways, it will be a landmark, providing a snapshot of research at a critical time in the development of this field." Science 249, 1054 "I strongly recommend this well-edited, thoughtful book to all students of population biology and community ecology." Bioscience 41, 178 Jim Grace obtained his Ph.D. from Michigan State University in 1980. He subsequently served on the faculty at the University of Arkansas and Louisiana State University. He joined the US Geological Survey - National Wetlands Research Center in 1992 and currently holds an Adjunct Professorship in Biology at the University of Louisiana in Lafayette. His basic research specialization is in plant ecology, with an emphasis on species interactions, biodiversity, invasive species, and conservation biology. He has been elected to the positions of chair and vice-chair of the Ecological Section of the Botanical Society of America. David Tilman is an experimental and theoretical ecologist interested in biodiversity, in the controls of ecosystem composition, stability and productivity, and in the long-term implications for society of human impacts on global ecosystems. He received his Ph.D. at the University of Michigan in 1976. He immediately came to the University of Minnesota where he now is Regents Professor, holds the McKnight University Presidential Chair in Ecology and is Director of Cedar Creek Natural History Area. He has written two books, edited three books, and published more than 160 scientific papers. In 2001, he was designated the most highly cited environmental scientist of the decade (1990-2000) by the Institute for Scientific Information.