Foundations of Restoration Ecology: The Science and Practice of Ecological Restoration / Edition 1

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Overview

As the practical application of ecological restoration continues to grow, there is an increasing need to connect restoration practice to areas of underlying ecological theory. Foundations of Restoration Ecology is an important milestone in the field, bringing together leading ecologists to bridge the gap between theory and practice by translating elements of ecological theory and current research themes into a scientific framework for the field of restoration ecology.

Each chapter addresses a particular area of ecological theory, covering traditional levels of biological hierarchy (such as population genetics, demography, community ecology) as well as topics of central relevance to the challenges of restoration ecology (such as species interactions, fine-scale heterogeneity, successional trajectories, invasive species ecology, ecophysiology). Several chapters focus on research tools (research design, statistical analysis, modeling), or place restoration ecology research in a larger context (large-scale ecological phenomena, macroecology, climate change and paleoecology, evolutionary ecology).

The book makes a compelling case that a stronger connection between ecological theory and the science of restoration ecology will be mutually beneficial for both fields: restoration ecology benefits from a stronger grounding in basic theory, while ecological theory benefits from the unique opportunities for experimentation in a restoration context.

Foundations of Restoration Ecology advances the science behind the practice of restoring ecosystems while exploring ways in which restoration ecology can inform basic ecological questions. It provides the first comprehensive overview of the theoretical foundations of restoration ecology, and is a must-have volume for anyone involved in restoration research, teaching, or practice.

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Editorial Reviews

Doris Duke Professor of Conservation Ecology, Duke University - Stuart Pimm

"Humanity has damaged more than half the land surface on Earth, making restoration an essential tool to preserve biodiversity. It is also the ultimate test of whether we scientists know enough to do the job. There is no better place to find out than inside this book."
Director, New Academy and DePaul University Institute for Nature and Culture - William R. Jordan III

"The publication of this book is an important event, a coming-of-age of restoration—it's an indispensable key to the survival and well-being of classic ecosystems, setting the context for basic ecological research. A rich trove of ecological theory in productive and provocative dialogue with restoration practice."
Professor of plant ecology, University of Gronigen, The Netherlands - Jelte van Andel

"This volume explores classical ecological theory from a perspective that identifies optimal strategies behind the practical application of restoration ecology in the near future. The editors and authors have produced a paragon of sustainability science."
Professor, Department of Botany and Plant Sciences, UC, Riverside - Edith B. Allen

"This is a comprehensive synthesis of the conceptual basis of the field of restoration ecology. With contributions by leading theoretical ecologists as well as by recognized restoration ecologists, it covers the range of hierarchies from population genetics to macroecology."
winner of two Pulitzer Prizes, University Research Professor Emeritus, Harvard University - Edward O. Wilson

"Restoration is a keystone strategy for conserving biodiversity, and ecology has matured into a central discipline of the biological sciences. This important work shows us that their synergy offers new hope for the future of life on Earth."
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Product Details

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Foundations of Restoration Ecology


By Donald A. Falk, Margaret A. Palmer, Joy B. Zedler

ISLAND PRESS

Copyright © 2006 Island Press
All rights reserved.
ISBN: 978-1-59726-017-6



CHAPTER 1

Ecological Theory and Restoration Ecology

MARGARET A. PALMER, DONALD A. FALK, AND JOY B. ZEDLER


Ecological restoration has been practiced in some form for centuries. For instance, many indigenous peoples tended lands to sustain natural ecosystem services, such as production of basket-weaving materials, food crops, or forage for game animals, and they continue to do so (Stevens 1997). Today, the practice of ecological restoration is receiving immense attention because it offers the hope of recovery from much of the environmental damage inflicted by misuse or mismanagement of the Earth's natural resources, especially by technologically advanced societies (Economist 2002; Malakoff 2004).

Strictly speaking, ecological restoration is an attempt to return a system to some historical state, although the difficulty or impossibility of achieving this aim is widely recognized. A more realistic goal may be to move a damaged system to an ecological state that is within some acceptable limits relative to a less disturbed system (Figure 1.1). In this sense of the term, ecological restoration can be viewed as an attempt to recover a natural range of ecosystem composition, structure, and dynamics (Falk 1990; Allen et al. 2002; Palmer et al. 2005). Correspondingly, restoration ecology is the discipline of scientific inquiry dealing with the restoration of ecological systems.

The simplest restorations involve removing a perturbation and allowing the ecosystem to recover via natural ecological processes. For example, a small sewage spill to a large lake might correct itself, if microorganisms can decompose the organic matter and the added nutrients do not trigger algal blooms. Locally extirpated species can recolonize sites as habitat quality improves, and the physical structure of communities can begin to resemble the pre-disruption condition.

More often, however, restoration requires multiple efforts, because multiple perturbations have pushed ecosystems beyond their ability to recover spontaneously. For example, restoring streams affected by urbanization often requires new stormwater infrastructure to reduce peak flows, followed by channel regrading and riparian plantings (Brown 2000). For coastal marshes that have been dredged for boat traffic, restoration might involve removing fill, recontouring intertidal elevations, amending dredge spoil substrates, and introducing native plants. In some cases, "restoration" sensu latu is never finished, as some level of maintenance is always needed (e.g., in wetlands dominated by invasive species). Full restoration means that the ecosystem is once again resilient—it has the capacity to recover from stress (SERI 2002; Walker et al. 2002). Yet it is rarely possible to achieve the self- sustaining state because degraded ecosystems typically lack natural levels of environmental variability (Baron et al. 2002; Pedroli et al. 2002) and their resilience is no longer recoverable (Suding et al. 2004).

While restoration is sometimes considered an art or a skill that is honed by practice and tutelage (Van Diggelen et al. 2001), science-based restorations are those projects that benefit from the infusion of ecological theory and application of the scientific method. Science-based restorations follow (1) explicitly stated goals, (2) a restoration design informed by ecological knowledge, and (3) quantitative assessment of system responses employing pre- and postrestoration data collection. Restoration becomes adaptive when a fourth step is followed: (4) analysis and application of results to inform subsequent efforts (Zedler and Callaway 2003). Analogous to adaptive management, the corrections that are made to the restoration process should be guided by sound theory and experimentation, not just trial and error.

An unfortunate aspect of ecological restoration as it is commonly practiced today is that the results of most efforts are not easily accessible to others. Despite pleas to report long-term responses (Zedler 2000; Lake 2001), most projects are not monitored postrestoration (NRC 1992; Bernhardt et al. 2005). Informing later efforts is in many ways the most critical element—science, in its simplest form, is the sequential testing of ideas that over time leads to a better understanding of nature.


Ecological Experimentation in a Restoration Context

The focus of this book is the mutual benefit of a stronger connection between ecological theory and the science of restoration ecology. Ecological restoration provides exciting opportunities to conduct large-scale experiments and test basic ecological theory, both of which have the potential to build the science of restoration ecology (Figure 1.2). A fundamental premise of this book is that the relationship of restoration ecology to ecological theory works in both directions: restoration ecology benefits from a stronger grounding in basic theory, while ecological theory benefits from the unique opportunities for experimentation in a restoration context (Palmer et al., 1997). Many examples of this reciprocity are found throughout this book.

Although ecology overall lacks a general unified theory, the field has developed a strong and diverse body of theory addressing nearly every aspect of ecological interactions (Weiner 1995; McPherson and DeStefano 2003). As evidenced throughout the book, this body of theory is highly relevant to both the science of restoration ecology and the practice of ecological restoration (Table 1.1). While ecological restoration has scientific underpinnings, the integration of ecological theory and restoration has been uneven, despite recognition that the practice could be enhanced by such integration (Young et al. 2005).

There is also great potential to enhance understanding of the basic structure and function of ecological systems by using restoration settings to develop and test theory (Bradshaw 1987; Jordan et al. 1987; Palmer et al. 1997; Hobbs and Harris 2001; Perrow and Davy 2002). Indeed, restored sites, or those that are soon to be restored, represent virtual playgrounds for asking how well ecological theories can predict the responses of natural systems.

The opportunity to test ecological theory in restoration sites is exciting; at the same time, ecologists and evolutionary biologists are challenged to use theory to devise experiments that can be conducted in restoration settings. We do not think this limits our inquiry to a reductionist paradigm: as with ecology itself, understanding can progress even when formal hypotheses cannot be framed (Pickett et al. 1994). Even more difficult is the challenge of designing experiments that are workable within a project's spatial extent, timing constraints, and resources. Finding suitable sites, receptive managers, interested researchers, appropriate ideas to test, and funding to test them—all at the same time and place—is challenging, but feasible and worth the effort. The payoff for the practice of ecological restoration comes in learning how to improve approaches, how to correct errors, how to accomplish desired outcomes, and how to plan future projects.

Can basic ecological abstractions of nature and mathematical models be used to inform restoration practice, given that ecological responses are often context- dependent? We think so. Every step in the restoration process can be informed by existing ecological theory (Table 1.1); however, every attempt to state predictions from theory also indicates the need to expand theory itself. Thus, we ask: Under what circumstances can we grow the science of restoration ecology using existing ecological theory? What issues or settings require an extension of our theories and models or even the development of theories de novo?


The Imperative to Advance Theory

Experience indicates that restoration follows multiple pathways, which means that outcomes are difficult to predict. Part of the difficulty is that restoration takes place across a multidimensional spectrum of specific sites within various kinds of landscapes, and where goals range from highly specific (e.g., enhance the population of one rare animal species) to general (e.g., encourage vegetation to cover bare substrate). The task of developing theory that offers a high level of predictability is akin to figuring out how to grow myriad crops across a heterogeneous continent. If we consider the centuries it has taken agriculturalists to optimize the crops that farmers should grow in one field in one region (e.g., alternate corn and beans or alfalfa within the cornbelt using specified soil amendments, planting, and harvesting protocols), the difficulty of reproducing entire ecosystems on demand becomes understandable. It could take much longer for the science of restoration to achieve predictable results, because there are more ecosystem types and a wider variety of tools. We assert that these conditions create a great need for guidance from ecological theory. For some ecosystems, ecological theory needs to be melded with physical science theory; for example, river restoration must be informed by geomorphic, hydrological, and ecological theory (Wohl et al. 2005; Palmer et al. 2006).

The need to develop a sound theoretical base for ecological restoration is imperative for at least three reasons. First, restoration is a booming business that requires the support of a knowledge base and research innovations (Economist 2002). Billions of dollars are spent annually to restore polluted and sediment-clogged streams (Bernhardt et al. 2005; Hassett et al. 2005) and to reforest lands that have been degraded and fragmented (Lamb and Gilmore 2003). Yet many restoration efforts are still trial-and-error improvisations. For example, every new biological invasion prompts a series of attempts to reduce or eradicate populations that increasingly damage native communities. Systematic evaluations of multiple tools in a common site come only after long delays in recognizing the magnitude of the problem and obtaining the resources to fund appropriate research.

Second, the stakes are far too high not to develop a stronger theory for restoration ecology. As the global human population continues to expand, vital resources, such as fresh water and arable soils, are threatened and depleted (Gleick 2003; McMichael et al. 2003; Stocking 2003). Obviously, conservation of resources prior to their degradation is desirable, but our crowded planet's current rate of resource consumption suggests that we must do more than hold the line (Sugden et al. 2003; Palmer et al. 2004). Where conservation has failed to sustain crucial ecological services, ecological restoration should be the option of choice (Dobson et al. 1997; Young 2000; Ormerod 2003). Given the state of our environment, restoration must use ecologically designed solutions (Pimm 1996; Palmer et al. 2004); our only other recourse is technological fixes to maintain ecosystem processes, an expensive and often ineffective option. Admittedly, some ecological technology (e.g., waste treatment) can improve people's lives, but many problems (e.g., spatially distributed water shortages) cannot be solved by technology, at least not affordably (Gleick 2003). Furthermore, technological fixes lack the aesthetic appeal of restored ecosystems and the species they support.

A third reason to enhance the linkage between ecological theory and restoration is to grow the field of ecology. Regardless of their specialty, ecologists can benefit greatly by testing theory in a restoration context (Palmer et al. 1997; Young et al. 2001). As Bradshaw (1987) noted, restoration is the "acid-test of ecological theory." If we cannot predict the development of a community at a restored or managed site based on knowledge of species and their interactions, then perhaps we can make use of what we observe to refine our theories and predictions and improve their predictive power (Zedler 2000; Hobbs and Harris 2001).


Origins and Structure of This Book

The fields of ecological restoration and restoration ecology have been well served by two journals of those same names for many years. Since their inception, these journals have published hundreds of articles on topics ranging from tools, techniques, research ideas, results, and philosophy. Today, articles on restoration also appear in mainstream ecological journals (e.g., Ecological Applications, Journal of Applied Ecology, Science). Yet, despite years of intellectual development, restoration ecology remains to be defined as a field of scientific endeavor and its conceptual foundations articulated. This realization ultimately is what led us to create this book.

Initially, we organized a symposium (Palmer et al. 2002) for the 2002 joint meeting of the Ecological Society of America (ESA) and the Society for Ecological Restoration International (SERI). In some respects, the 2002 symposium was a follow-up to a previous (1996) meeting of ecologists and land managers at the National Center for Ecological Analysis and Synthesis (NCEAS) to discuss the conceptual basis of restoration ecology (Allen et al. 1997). This culminated in a series of journal articles (Allen et al. 1997; Ehrenfeld and Toth 1997; Michener 1997; Montalvo et al. 1997; Palmer et al. 1997; Parker 1997; White and Walker 1997) devoted to identifying the conceptual framework for restoration ecology and outlining critical research questions that offer unique opportunities to couple basic research with the practical needs of restorationists. Our hope was to move both ecology and the field of restoration ecology forward.

For the 2002 symposium, we asked scientists well versed in ecological theory—but not necessarily active in restoration work—to present their most creative ideas on the linkage (real or potential) between ecological theory and restoration ecology. We also asked scientists actively involved in restoration research to illustrate how ecological theory has been coupled with restoration efforts and/or how they have tested ecological theory in a restoration context. This emphasis on two-way communication of ideas between ecological theorists and restoration ecologists is carried forward in this volume.

Selecting the topics to include in this book was not easy. We have used the word theory broadly to include ecological and evolutionary concepts, predictive models, and mathematical models. We organized the book around the ecological concepts and principles that are fundamental to restoration. Our goals were to provide comprehensive overview of the theoretical foundations of restoration ecology, and to identify critical areas in which new theory is needed, existing theory needs to be tested, and new and exciting cross- disciplinary questions need to be addressed.

Each chapter in this book addresses a particular area of ecological theory. Some of these (e.g. population genetics, demography, community ecology) are traditional levels of biological hierarchy, while others (species interactions, fine-scale heterogeneity, successional trajectories, invasive species ecology, ecophysiology, and functional ecology) explore specific topics of central relevance to the challenges of restoration ecology. Several chapters focus on research tools (research design, statistical analysis, modeling, and simulations), or place restoration ecology research in a larger context (macroecology, paleoecology and climate change, evolutionary ecology). Some areas merit more specific coverage, including ecosystem processes (e.g., restoration of biogeochemical processes) and landscape-level spatial ecology, both of which are highly relevant to restoration and merit further work. Other important areas fell outside the scope of this book, and we urge readers to consult other sources for information on the economics of ecological restoration; on sociological issues, such as stakeholder "buy-ins" that often determine the success of a project; and on engineering principles and technical issues that are required for some types of restoration.


(Continues...)

Excerpted from Foundations of Restoration Ecology by Donald A. Falk, Margaret A. Palmer, Joy B. Zedler. Copyright © 2006 Island Press. Excerpted by permission of ISLAND PRESS.
All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.
Excerpts are provided by Dial-A-Book Inc. solely for the personal use of visitors to this web site.

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Table of Contents


Foreword
Acknowledgments
 
Chapter 1. Ecological Theory and Restoration Ecology
 
PART I. Ecological Theory and the Restoration of Populations and Communities
Chapter 2. Population and Ecological Genetics in Restoration Ecology
Chapter 3. Ecophysiological Constraints on Plant Responses in a Restoration Setting
Chapter 4. Implications of Population Dynamic and Metapopulation Theory for Restoration
Chapter 5. Restoring Ecological Communities: From Theory to Practice
Chapter 6. Evolutionary Restoration Ecology
 
PART II. Restoring Ecological Function
Chapter 7. Topographic Heterogeneity Theory and Ecological Restoration
Chapter 8. Food-Web Approaches in Restoration Ecology
Chapter 9. The Dynamic Nature of Ecological Systems: Multiple States and Restoration Trajectories
Chapger 10. Biodiversity and Ecosystem Functioning in Restored Ecosystems: Extracting Principles for a Synthetic Perspective
Chapte 11. A Modeling Framework for Restoration Ecology
 
PART III. Restoration Ecology in Context
Chapte 12. Using Ecological Theory to Manage or Restore Ecosystems Affected by Invasive Plant Species
Chapter 13. Statistical Issues and Study Design in Ecological Restorations:  Lessons Learned from Marine Reserves
Chapter 14. Ecological Restoration from a Macroscopic Perspective
Chapter 15. Climate Change and Paleoecology: New Contexts for Restoration Ecology
Chapter 16. Integrating Restoration Ecology and Ecological Theory: A Synthesis
 
About the Editors
About the Contributors
Index
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