Invasion of Plant Communities

Due to numerous human activities, organisms have been transported and either accidentally or deliberately introduced all around the globe. Biological invasions are now considered to be one of the main drivers of global change because many invasive plants have severe ecological, economic, and health consequences. Thus, there is an ever-growing need to better understand invasions to determine how specific plant species are able to establish in communities and, in many cases, expand their range. Here, we describe the invasion process and how it contributes to the invasion of plant communities. We present an invasion-factor framework (IFF) model that uses three factors (climate dynamics, ecosystem resistance, and invader fitness) to explain how each plays a role in the introduction of plants and their ultimate failure or success (i.e., becoming invasive). The invasion of plant communities starts with the uptake of propagules from the native range, followed by their transport to and release into a new territory, where they become established and can spread or expand. Propagule pressure, prior adaptation, anthropogenically induced adaptation to invade, and post-introduction evolution are several theories that have been posed to explain the establishment of invasive plants. Further, traits of invasive plants, either before (existing) or after (developed) introduction, provide a mechanistic understanding with direct ties to the three factors of the IFF. The IFF is a general guide with which to study the invasion process based on specific factors for individual invaders and their target communities. The IFF combines (a) climatic dynamics, analogous to environmental filters; (b) ecosystem resistance, which prevents invasive plants from becoming established even if they are able to overcome the climate factor; and (c) invader fitness, relating to the genetic diversity of invasive plants, which allows them to become established after overcoming climate and ecosystem resistance factors. Case studies from the literature provide examples of research investigating each of the three factors of the IFF, but none exist that describe all the factors at once for any given invasive plant species. The application of the IFF for management is most appropriate once an invasive plant has become established, as preventative measures before this point rely only on accurate identification (detection) and removal (response). The IFF model should be considered as a tool to establish research priorities and identify components in the invasion process and inform restoration efforts. We advocate that the IFF should be integrated into management practices to help in the decision-making process that contributes to more effective practices that reduce the occurrence and impacts of invasive plants in a range of communities

Epilogue: The Need for a New and Critical Democracy

Democratic critiques of neoliberalism have been comparatively rare, and positive democratic rejoinders to the social and political ruins of neoliberalism have been rarer. The question thus presents itself – what would an overtly democratic critique of neoliberalism look like and, beyond critique, what would a constructive democratic response to neoliberalism entail

Of Rights and Regulation

This chapter explores the development of social provisioning as a matter not of right but of democratic administration in France and the United States in the nineteenth century. The authors take issue with conventional chronologies of rights development, which see civil and political rights being developed in the eighteenth and nineteenth centuries, with social rights appearing in the twentieth. Such categories and sequencing obscure the ways in which democratic administrations took the problem of social provisioning seriously. A history of socio-economic rights cannot be distinguished from the less formal technologies of socio-economic regulation that were an integral part of the democratic question across the nineteenth century, and, in particular, the modernisation of regulatory governance. The democratisation of administrative powers precluded any sharp distinction among the political, the social and the economic. For better and for worse, this process took place through the building, rescaling and redefining of older, pre-democratic technologies of governance in response to what were perceived as pressing public problems

Beyond Stateless Democracy

Pierre Bourdieu began his posthumously published lectures “On the State” by highlighting the three dominant traditions that have framed most thinking about the state in Western social science and modern social theory. On the one hand, he highlighted what he termed the “initial definition” of the state as a “neutral site” designed to regulate conflict and “serve the common good.” Bourdieu traced this essentially classical liberal conception of the state back to the pioneering political treatises of Thomas Hobbes and John Locke.1 In direct response to this “optimistic functionalism,” Bourdieu noted the rise of a critical and more “pessimistic” alternative—something of a diametric opposite

Propagule Pressure and Introduction Pathways of \u3cem\u3eBromus Tectorum\u3c/em\u3e (Cheatgrass; Poaceae) in the Central United States

An introduced species\u27 propagule pressure strongly influences the genetic diversity and evolutionary potential of its descendants and even the likelihood of biological invasion. We examined population genetic consequences arising from introduction of the invasive annual grass Bromus tectorum into the central United States (U.S.). The origin and frequency of introductions were investigated by assembling allozyme diversity data from 60 widely spaced populations. At least five introduction events contributed to the grass’s genetic diversity in the central U.S. Populations in this region have fewer alleles (30 vs. 43) and polymorphic loci (5 vs. 13) than native populations, evidence of a genetic bottleneck. However, the populations are, on average, more genetically diverse and less structured than native populations. Assembly within central U.S. populations of previously allopatric genotypes may have allowed the formation, via outcrossing, of a rare multilocus genotype. Genetic admixtures may have occurred through any combination of east-to-west spread coincident with nineteenth-century arrival of European settlers, dispersal from southern Ontario via Great Lakes shipping and commerce, and direct introduction from the native range. Our results illustrate the population genetic consequences of relatively high propagule pressure (i.e., repeated immigrations to a new range from multiple sources)

Toward a History of the Democratic State

Over the past generation, the history of the state has been experiencing a much-noted renaissance, especially in France and the United States. In the United States as late as 1986, Morton Keller complained to William Leuchtenburg in the Journal of American History: “To say that ‘there is much still to be learned about the nature of the State in America’ is … a major understatement. There is close to everything to be learned about the State.” In France as late as 1990, Pierre Rosanvallon’s powerful introduction to L’État en France suggested that an ambitious history of the state could not yet be written because of the lack of works focused specifically on the state. As he put it, “L’État comme problème politique, ou comme phénomène bureaucratique, est au coeur des passions partisanes et des débats philosophiques tout en restant une sorte de non-objet historique.” As the essays in this volume attest, much has changed in the historiography of the American and French states in the intervening 25 years. The state has indeed been brought “back in” in Theda Skocpol’s influential words. In fact, the return of the state in history, theory, and the social sciences in both France and the United States has been so strong and successful, that the subject of “the state/l’État” has again itself become an intellectual crossroads—and a contested terrain—for new important debates and controversies concerning the French and American past more generally

Democratic States of Unexception: Towards a New Genealogy of the American Political

This chapter takes issue with the history and theory of exception along these three lines. The first section offers a critique of the idea of law at the heart of the theory of exception. By taking a closer look at the history and theory of law in early nineteenth-century America, it offers an alternative reading of the role of exception in Emerson’s America – a place and time in which the exception in law was anything but exceptional. The second section offers a critique of the idea of state and sovereignty at the heart of the theory of exception in the early twentieth century. In place of Schmitt’s concept of the political, it offers a reconsideration of John Dewey’s more democratic conception of “the public” and its problems, where again the exception is an unexceptional part of an everyday and agonistic democratic politics. The third section moves us further into the twentieth century, challenging the suzerainty of both liberal and neoliberal characterizations of exception and totalitarianism in that ideologically charged period. Here, Charles Merriam’s ideas about new democracy and new despotism provide an alternative reference point for thinking about the exception, its antidemocratic dangers, and its democratic possibilities. In the context of a revitalized theory of the nature of power in democratic states, the exception does not appear so exceptional. Indeed, when viewed from the perspective of democratic state history, the exception may be one of the most common ways that democratic states exercise power every day. Evaluating the state of exception from the critical perspective of the modern democratic state exposes the limits of the notions of formal law, bureaucratic statecraft, and liberal politics that so frequently preoccupy discussions of exception and emergency governance. Those rather profound limitations suggest the need for an alternative genealogy of the political. In the theories of law, state, and politics in the writings of Emerson, Dewey, and Merriam, this essay proposes a tentative new genealogy of the modern American political – where democracy is not a problem but a solution and where the exception is not exceptional but one of the most quotidian ways of exercising power in agonistic modes of self-government

Social Freedom, Democracy and the Political: Three Reflections on Axel Honneth\u27s Idea of Socialism

Axel Honneth’s Idea of Socialism is an important clarion call for an urgent rethinking of the possibilities of a socialism for the twenty-first century. One of the most surprising and satisfying aspects of Axel Honneth’s timely new book is its recovery of the continued vitality of John Dewey’s pragmatic democratic philosophy. These reflections on Honneth’s use of John Dewey for democratizing social freedom, take stock of and explore the political limits of Honneth’s social reconstruction

Mapping of Forest Alliances and Associations Using Fuzzy Systems and Nearest Neighbor Classifiers

The study and management of biological communities depends on systems of classification and mapping for the organization and communication of resource information. Recent advances in remote sensing technology may enable the mapping forest plant associations using image classification techniques. But few areas outside Europe have alliances and associations described in detail sufficient to support remote sensing-based modeling. Northwestern Montana has one of the few plant association treatments in the United States compliant with the recently established National Vegetation Classification system. This project examined the feasibility of mapping forest plant associations using Landsat Enhanced Thematic Mapper data and advanced remote sensing technology and image classification techniques. Suitable reference data were selected from an extensive regional database of plot records. Fifteen percent of the plot samples were reserved for validation of map products, the remainder of plots designated as training data for map modeling. Key differentia for image classification were identified from a suite of spectral and biophysical variables. Fuzzy rules were formulated for partitioning physiognomic classes in the upper levels of our image classification hierarchy. Nearest neighbor classifiers were developed for classification of lower levels, the alliances and associations, where spectral and biophysical contrasts are less distinct. Maps were produced to reflect nine forest alliances and 24 associations across the study area. Error matrices were constructed for each map based on stratified random selections of map validation samples. Accuracy for the alliance map was estimated at 60%. Association classifiers provide between 54 and 86% accuracy within their respective alliances. Alternative techniques are proposed for aggregating classes and enhancing decision tree classifiers to model alliances and associations for interior forest types