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Provides a comprehensive review of the role of species interactions in the process of plant community assembly.
The question "Why are there so many species?" has puzzled ecologist for a long time. Initially, an academic question, it has gained practical interest by the recent awareness of global biodiversity loss. Species diversity in local ecosystems has always been discussed in relation to the problem of competi tive exclusion and the apparent contradiction between the competitive exclu sion principle and the overwhelming richness of species found in nature. Competition as a mechanism structuring ecological communities has never been uncontroversial. Not only its importance but even its existence have been debated. On the one extreme, some ecologists have taken competi tion for granted and have used it as an explanation by default if the distribu tion of a species was more restricted than could be explained by physiology and dispersal history. For decades, competition has been a core mechanism behind popular concepts like ecological niche, succession, limiting similarity, and character displacement, among others. For some, competition has almost become synonymous with the Darwinian "struggle for existence", although simple plausibility should tell us that organisms have to struggle against much more than competitors, e.g. predators, parasites, pathogens, and envi ronmental harshness.
It is not often that one has the opportunity to send a public birthday greet ing to a friend and colleague of many years, and to congratulate him on having reached the age of reason. In fact it happens only once, and comes then as a surprise. Surely it was only a few years ago that we sat together at an International Genetics Congress in Ithaca, and only yesterday that we became members of the same department. The eighth floor of Schermerhorn Hall had a north end where the flies were and a south end furnished with mice, and in between, a seminar room and laboratory. There the distances were short and the doors open and the coffee pot busy. But it now appears that yesterday has fallen thirty years behind and that we have grown up. I find it interesting and appropriate that Dobzhansky's lifetime spans the period of maturation of the fields to which this volume is devoted. This is true in a chronological sense for his birth occurred in the same year, 1900, in which modern genetics began. The rediscovery of Mendel's princi ples and the interpretation of the nature of heredity and variation to which this event led were necessary prerequisites to the development of evolution ary biology as presented in this collection of essays.
Examining the way people imagine and interact in their cities, this book explores the post-cosmopolitan city. The contributors consider the effects of migration, national, and religious revivals (with their new aesthetic sensibilities), the dispositions of marginalized economic actors, and globalized tourism on urban sociality. The case studies here share the situation of having been incorporated in previous political regimes (imperial, colonial, socialist) that one way or another created their own kind of cosmopolitanism, and now these cities are experiencing the aftermath of these regimes while being exposed to new national politics and migratory flows of people. Caroline Humphrey is a Research Director in the Department of Social Anthropology at the University of Cambridge. She has worked in the USSR/Russia, Mongolia, Inner Mongolia, Nepal, and India. Her research interests include socialist and post-socialist society, religion, ritual, economy, history, and the contemporary transformations of cities. Vera Skvirskaja is a postdoctoral researcher in the Department of Anthropology at Copenhagen University. She has worked in arctic Siberia, Uzbekistan and Ukraine. Her recent research interests include urban cosmopolitanism, educational migration in Europe and coexistence in the post-Soviet city.
A comprehensive framework for understanding species coexistence Coexistence is the central concept in community ecology, but an understanding of this concept requires that we study the actual mechanisms of species interactions. Coexistence in Ecology examines the major features of these mechanisms for species that coexist at different positions in complex food webs, and derives empirical tests from model predictions. Exploring the various challenges species face, Mark McPeek systematically builds a model food web, beginning with an ecosystem devoid of life and then adding one species at a time. With the introduction of each new species, he evaluates the properties it must possess to invade a community and quantifies the changes in the abundances of other species that result from a successful invasion. McPeek continues this process until he achieves a multitrophic level food web with many species coexisting at each trophic level, from omnivores, mutualists, and pathogens to herbivores, carnivores, and basic plants. He then describes the observational and experimental empirical studies that can test the theoretical predictions resulting from the model analyses. Synthesizing decades of theoretical research in community ecology, Coexistence in Ecology offers new perspectives on how to develop an empirical program of study rooted in the natural histories of species and the mechanisms by which they actually interact with one another.
Much effort has been devoted to developing theories to explain the wide variation we observe in reproductive allocation among environments. Reproductive Allocation in Plants describes why plants differ in the proportion of their resources that they allocate to reproduction and looks into the various theories. This book examines the ecological and evolutionary explanations for variation in plant reproductive allocation from the perspective of the underlying physiological mechanisms controlling reproduction and growth. An international team of leading experts have prepared chapters summarizing the current state of the field and offering their views on the factors determining reproductive allocation in plants. This will be a valuable resource for senior undergraduate students, graduate students and researchers in ecology, plant ecophysiology, and population biology. - 8 outstanding chapters dedicated to the evolution and ecology of variation in plant reproductive allocation - Written by an international team of leading experts in the field - Provides enough background information to make it accessible to senior undergraduate students - Includes over 60 figures and 29 tables
This book focuses on the ethnically composite, heterogeneous, mixed nature of the Mediterranean cities and their cultural heritage between the late middle ages and early modern times. How did it affect the cohabitation among different people and cultures on the urban scene? How did it mold the shape and image of cities that were crossroads of encounters, but also the arena of conflict and exclusion? The 13 case studies collected in this volume address these issues by exploring the traces left by centuries of interethnic porosity on the tangible and intangible heritage of cities such as Acre and Cyprus, Genoa and Venice, Rome and Istanbul, Cordoba and Tarragona.
This book seeks to contribute to the most recent discussions on Citizenship, Culture and Coexistence in different context considering the importance of these elements for society and urban environments. The book offers different perspectives on citizenship culture and analysis that can be inputs for policy and decision makers to design the policies, strategies and programs that strengthen urban process from culture, art, and education to improve citizen coexistence, respect for differences and better societies in a dynamic world with permanent challenges.
Competition between species arises when two or more species share at least some of the same limited resources. It is likely to affect all species, as well as many higher-level aspects of community and ecosystem dynamics. Interspecific competition shares many of the same features as density dependence (intraspecific competition) and evolution (competition between genotypes). In spite of this, a robust theoretical framework is not yet in place to develop a more coherent understanding of this important interaction. Despite its prominence in the ecological literature, the theory seems to have lost direction in recent decades, with many synthetic papers promoting outdated ideas, failing to use resource-based models, and having little utility in applied fields such as conservation and environmental management. Competition theory has done little to incorporate new findings regarding consumer-resource interactions in the context of larger food webs containing behaviourally or evolutionarily adapting components. Overly simple models and methods of analysis continue to be influential. Competition Theory in Ecology represents a timely opportunity to address these shortcomings and suggests a more useful approach to modelling that can provide a basis for future models that have greater predictive ability in both ecology and evolution. The book concludes with some broader observations on the lack of agreement on general principles to use in constructing mathematical models to help understand ecological systems. It argues that a more open discussion and debate of the underlying structure of ecological theory is now urgently required to move the field forward.
Following the conclusion of the latest round of reforms to the Common Agricultural Policy (CAP) in 2013, the Research Handbook on EU Agriculture Law provides an up-to-date discussion of these reforms and the changing landscape in which the CAP now operates. Adopting an interdisciplinary approach, and with international contributors from across Europe and the United States, the Handbook commences with analyses of the legal instruments which implement the reformed CAP, before moving on to consider questions of land use, the role of agriculture within the wider food chain and the international dimension. In these contexts, particular issues identified include: the environmental impact of past, present and future farming practices; the ability of the food chain to accommodate consumer preferences and scientific innovation; and the hurdles to be cleared before international consensus can be reached on a whole range of agricultural imperatives. As well as providing a state-of-the-art point of reference for academics, this comprehensive book will be of great interest to students, scholars and policymakers dealing with these new challenges faced by agriculture in the EU.