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Patterns Of Diversity And Community Composition
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Book Synopsis Patterns of Diversity and Community Composition by : M. Claire Horner-Devine
Download or read book Patterns of Diversity and Community Composition written by M. Claire Horner-Devine and published by . This book was released on 2004 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Algal Ecology written by and published by Academic Press. This book was released on 1996-06-03 with total page 781 pages. Available in PDF, EPUB and Kindle. Book excerpt: Algae are an important component of aquatic benthic ecosystems because they reflect the health of their environment through their density, abundance, and diversity. This comprehensive and authoritative text is divided into three sections to offer complete coverage of the discussion in this field. The first section introduces the locations of benthic algae in different ecosystems, like streams, large rivers, lakes, and other aquatic habitats. The second section is devoted to the various factors, both biotic and abiotic, that affect benthic freshwater algae. The final section of the book focuses on the role played by algae in a variety of complex freshwater ecosystems. As concern over environmental health escalates, the keystone and pivotal role played by algae is becoming more apparent. This volume in the Aquatic Ecology Series represents an important compilation of the latest research on the crucial niche occupied by algae in aquatic ecosystems. Presents algae as the important player in relation to environmental health Prepared by leading authorities in the field Includes comprehensive treatment of the functions of benthic algae as well as the factors that affect these important aquatic organisms Acts as an important reference for anyone interested in understanding and managing freshwater ecosystems
Book Synopsis Beta-diversity Patterns and Community Assembly Across Latitudes by : Emma Rose Moran
Download or read book Beta-diversity Patterns and Community Assembly Across Latitudes written by Emma Rose Moran and published by . This book was released on 2017 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: A major goal of community ecology is in understanding variation in community composition, generally termed [beta]-diversity. This variation can result from a variety of mechanisms, including deterministic factors, wherein species sort along biotic or abiotic gradients; stochastic processes, whereby random fluctuations in population sizes cause variation in community composition; and/or dispersal limitation. Although all of these processes are likely occurring in all biological communities, a key question in community ecology research is if their relative importance may vary systematically across environmental or biogeographic gradients.In this dissertation, we combine both observational and experimental research to investigate [beta]-diversity across a biogeographic gradient of longstanding interest in ecology and evolutionary biology, the latitudinal gradient. Diversity at the local and/or regional scale has long been known to decrease with latitude, but only relatively recently have similar trends been shown for [beta]-diversity as well. Although this may suggest that community assembly processes that generate [beta]-diversity may also be varying with latitude, [beta]-diversity metrics are numerically dependent to varying degrees on different aspects of regional and local diversity. Therefore, any trends in [beta]-diversity with latitude could simply be reflecting the well-documented trends in local and/or regional diversity, generally referred to as sampling effects. Throughout this dissertation, therefore, we employ a relatively uncommon [beta]-diversity metric, heretofore termed [beta]-pie, that is relatively insensitive to sampling effort (the number of individuals sampled locally) and to the shape of the regional species abundance distribution, which we believe will improve the assessment of how and why community composition may vary in space and time. In Chapter 2, we apply this metric to zooplankton communities sampled across ten latitudes in North America and three years to determine if, after accounting for the aforementioned sampling effects, there are any general trends of spatial and/or temporal turnover with latitude. Although we recovered a significant relationship between spatial [beta]-pie and latitude in two years, these trends actually reversed from one year to the next, and there was no significant relationship in the third year. Unlike other studies documenting temporal turnover as a function of latitude, we found no relationship between temporal [beta]-pie and latitude. These results together suggest that systematic variation in[beta]-diversity along local and/or regional diversity gradients (such as with latitude) may simply be reflecting numerical sampling effects instead of systematic variation in community assembly processes. Chapters 3 and 4 report the results of large-scale outdoor mesocosm experiments replicated at three latitudes in North America. By using mesocosms, we attempted to limit abiotic heterogeneity and historical differences, but allow for natural variation in regional species pools to affect community assembly. Chapter 3 specifically focuses on the role of an environmental filter, drought, and asks how it affects within-site aggregation, as well as whether its effect on [beta]-pie varies consistently with latitude. Interestingly, we found that[beta]-pie could either increase or decrease after the drought treatment, and although we did find regional differences in its effect, these did not vary systematically with latitude. In addition, it appears that variation in [beta]-pie was not due to changes in local diversity ([alpha]-pie) but largely caused by changes in the regional species abundance distribution ([gamma]-pie).Chapter 4 focused on how dispersal at different stages of assembly affects [beta]-pie. Because we did not intentionally impose abiotic heterogeneity, this experiment focused on the interaction between dispersal, stochasticity, and species interactions in generating intraspecific aggregation during community assembly. The two dispersal treatments occurred at different stages of assembly -- 1) during the initial establishment of communities, when population sizes are relatively small and demographic stochasticity might generate high variation in initial colonists, and 2) two years after communities have assembled, when population sizes are much larger and species have a greater potential to deterministically interact. Like the drought treatment, we found variable effects of dispersal on [beta]-pie. The early dispersal treatments (high versus low) were found to increase, decrease, or have no effect on aggregation, and there was no general trend with latitude. The late dispersal treatment effects did show some interesting trends for passive dispersers, however, wherein the high dispersal treatment actually increased [beta]-pie relative to the controls. In addition, this effect tended to decrease with latitude, suggesting that perhaps dispersal limitation plays a greater role in community assembly with decreasing latitude.
Book Synopsis Insect Communities: Diversity Patterns and their Driving Forces by : Ai-Bing Zhang
Download or read book Insect Communities: Diversity Patterns and their Driving Forces written by Ai-Bing Zhang and published by Frontiers Media SA. This book was released on 2023-03-17 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Intermittent Rivers and Ephemeral Streams by : Thibault Datry
Download or read book Intermittent Rivers and Ephemeral Streams written by Thibault Datry and published by Academic Press. This book was released on 2017-07-11 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intermittent Rivers and Ephemeral Streams: Ecology and Management takes an internationally broad approach, seeking to compare and contrast findings across multiple continents, climates, flow regimes, and land uses to provide a complete and integrated perspective on the ecology of these ecosystems. Coupled with this, users will find a discussion of management approaches applicable in different regions that are illustrated with relevant case studies. In a readable and technically accurate style, the book utilizes logically framed chapters authored by experts in the field, allowing managers and policymakers to readily grasp ecological concepts and their application to specific situations. Provides up-to-date reviews of research findings and management strategies using international examples Explores themes and parallels across diverse sub-disciplines in ecology and water resource management utilizing a multidisciplinary and integrative approach Reveals the relevance of this scientific understanding to managers and policymakers
Book Synopsis The Theory of Ecological Communities (MPB-57) by : Mark Vellend
Download or read book The Theory of Ecological Communities (MPB-57) written by Mark Vellend and published by Princeton University Press. This book was released on 2020-09-15 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: A plethora of different theories, models, and concepts make up the field of community ecology. Amid this vast body of work, is it possible to build one general theory of ecological communities? What other scientific areas might serve as a guiding framework? As it turns out, the core focus of community ecology—understanding patterns of diversity and composition of biological variants across space and time—is shared by evolutionary biology and its very coherent conceptual framework, population genetics theory. The Theory of Ecological Communities takes this as a starting point to pull together community ecology's various perspectives into a more unified whole. Mark Vellend builds a theory of ecological communities based on four overarching processes: selection among species, drift, dispersal, and speciation. These are analogues of the four central processes in population genetics theory—selection within species, drift, gene flow, and mutation—and together they subsume almost all of the many dozens of more specific models built to describe the dynamics of communities of interacting species. The result is a theory that allows the effects of many low-level processes, such as competition, facilitation, predation, disturbance, stress, succession, colonization, and local extinction to be understood as the underpinnings of high-level processes with widely applicable consequences for ecological communities. Reframing the numerous existing ideas in community ecology, The Theory of Ecological Communities provides a new way for thinking about biological composition and diversity.
Download or read book Ecological Systems written by Rik Leemans and published by Springer Science & Business Media. This book was released on 2012-12-12 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earth is home to an estimated 8 million animal species, 600,000 fungi, 300,000 plants, and an undetermined number of microbial species. Of these animal, fungal, and plant species, an estimated 75% have yet to be identified. Moreover, the interactions between these species and their physical environment are known to an even lesser degree. At the same time, the earth’s biota faces the prospect of climate change, which may manifest slowly or extremely rapidly, as well as a human population set to grow by two billion by 2045 from the current seven billion. Given these major ecological changes, we cannot wait for a complete biota data set before assessing, planning, and acting to preserve the ecological balance of the earth. This book provides comprehensive coverage of the scientific and engineering basis of the systems ecology of the earth in 15 detailed, peer-reviewed entries written for a broad audience of undergraduate and graduate students as well as practicing professionals in government, academia, and industry. The methodology presented aims at identifying key interactions and environmental effects, and enabling a systems-level understanding even with our present state of factual knowledge.
Book Synopsis Resource Competition and Community Structure by : David Tilman
Download or read book Resource Competition and Community Structure written by David Tilman and published by Princeton University Press. This book was released on 1982-08-21 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Landscape Boundaries by : Andrew J. Hansen
Download or read book Landscape Boundaries written by Andrew J. Hansen and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: The emergence of landscape ecology during the 1980s represents an impor tant maturation of ecological theory. Once enamored with the conceptual beauty of well-balanced, homogeneous ecosystems, ecologists now assert that much of the essence of ecological systems lies in their lumpiness. Patches with differing properties and behaviors lie strewn across the land scape, products of the complex interactions of climate, disturbance, and biotic processes. It is the collective behavior of this patchwork of eco systems that drives pattern and process of the landscape. is not an end point This realization of the importance of patch dynamics in itself, however. Rather, it is a passage to a new conceptual framework, the internal workings of which remain obscure. The next tier of questions includes: What are the fundamental pieces that compose a landscape? How are these pieces bounded? To what extent do these boundaries influence communication and interaction among patches of the landscape? Will con sideration of the interactions among landscape elements help us to under stand the workings of landscapes? At the core of these questions lies the notion of the ecotone, a term with a lineage that even predates ecosystem. Late in the nineteenth century, F. E. Clements realized that the transition zones between plant communi ties had properties distinct from either of the adjacent communities. Not until the emergence of patch dynamics theory, however, has central signif icance of the ecotone concept become apparent.
Book Synopsis Biological Diversity by : Anne E. Magurran
Download or read book Biological Diversity written by Anne E. Magurran and published by Oxford University Press. This book was released on 2011 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an up to date review of the methods of measuring and assessing biological diversity, together with their application.
Book Synopsis Measuring Biological Diversity by : Anne E. Magurran
Download or read book Measuring Biological Diversity written by Anne E. Magurran and published by John Wiley & Sons. This book was released on 2013-04-18 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: This accessible and timely book provides a comprehensive overview of how to measure biodiversity. The book highlights new developments, including innovative approaches to measuring taxonomic distinctness and estimating species richness, and evaluates these alongside traditional methods such as species abundance distributions, and diversity and evenness statistics. Helps the reader quantify and interpret patterns of ecological diversity, focusing on the measurement and estimation of species richness and abundance. Explores the concept of ecological diversity, bringing new perspectives to a field beset by contradictory views and advice. Discussion spans issues such as the meaning of community in the context of ecological diversity, scales of diversity and distribution of diversity among taxa Highlights advances in measurement paying particular attention to new techniques such as species richness estimation, application of measures of diversity to conservation and environmental management and addressing sampling issues Includes worked examples of key methods in helping people to understand the techniques and use available computer packages more effectively
Book Synopsis Community Ecology by : Peter J. Morin
Download or read book Community Ecology written by Peter J. Morin and published by John Wiley & Sons. This book was released on 2011-06-09 with total page 731 pages. Available in PDF, EPUB and Kindle. Book excerpt: All life on earth occurs in natural assemblages called communities. Community ecology is the study of patterns and processes involving these collections of two or more species. Communities are typically studied using a diversity of techniques, including observations of natural history, statistical descriptions of natural patterns, laboratory and field experiments, and mathematical modelling. Community patterns arise from a complex assortment of processes including competition, predation, mutualism, indirect effects, habitat selection, which result in the most complex biological entities on earth – including iconic systems such as rain forests and coral reefs. This book introduces the reader to a balanced coverage of concepts and theories central to community ecology, using examples drawn from terrestrial, freshwater, and marine systems, and focusing on animal, plant, and microbial species. The historical development of key concepts is described using descriptions of classic studies, while examples of exciting new developments in recent studies are used to point toward future advances in our understanding of community organization. Throughout, there is an emphasis on the crucial interplay between observations, experiments, and mathematical models. This second updated edition is a valuable resource for advanced undergraduates, graduate students, and established scientists who seek a broad overview of community ecology. The book has developed from a course in community ecology that has been taught by the author since 1983. Figures and tables can be downloaded for free from www.wiley.com/go/morin/communityecology
Book Synopsis Applied Urban Ecology by : Matthias Richter
Download or read book Applied Urban Ecology written by Matthias Richter and published by John Wiley & Sons. This book was released on 2011-09-19 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applied Urban Ecology: A Global Framework explores ways in which the environmental quality of urban areas can be improved starting with existing environmental conditions and their dynamics. Written by an internationally renowned selection of scientists and practitioners, the book covers a broad range of established and novel approaches to applied urban ecology. Approaches chosen for the book are placed in the context of issues such as climate change, green- and open-space development, flood-risk assessment, threats to urban biodiversity, and increasing environmental pollution (especially in the “megacities” of newly industrialized countries). All topics covered were chosen because they are socially and socio-politically relevant today. Further topics covered include sustainable energy and budget management, urban water resource management, urban land management, and urban landscape planning and design. Throughout the book, concepts and methods are illustrated using case studies from around the world. A closing synopsis draws conclusions on how the findings of urban ecological research can be used in strategic urban management in the future. Applied Urban Ecology: A Global Framework is an advanced textbook for students, researchers and experienced practitioners in urban ecology and urban environmental research, planning, and practice.
Download or read book Meiobenthology written by Olav Giere and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a comprehensive treatise on meiobenthology, the science of small animals which live, often disregarded even by zoologists, in huge numbers in all aquatic sediments. Covering all the scientific literature on the subject, particular emphasis is placed on ecological and systematic aspects. After a survey of the biotope conditions and important methods, the animals are introduced in a systematic account. This is followed by a report on the meiobenthos in relevant biotopes. The book concludes with an analysis of the productive role and the position of meiofauna in the food web and perspectives for future research.
Book Synopsis Spatial and Temporal Patterns of Diversity and Community Composition in Marine Molluscan Microbiomes by : Alexander Theodore Neu
Download or read book Spatial and Temporal Patterns of Diversity and Community Composition in Marine Molluscan Microbiomes written by Alexander Theodore Neu and published by . This book was released on 2021 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ecological communities have been shown to vary in some predictable ways through space, time, and along environmental gradients, suggesting there may be underlying "rules" in ecology which govern these patterns and processes. However, nearly all our knowledge of these trends comes from studies of large eukaryotes such as plants and animals, and we know very little about how these eukaryotic patterns compare to those of bacteria and archaea, the most dominant life forms on the planet. The goal of this dissertation is to determine whether ecological patterns that are evident in plants and animals are also applicable to host-associated microbes. First, I investigated whether these microbes exhibit large-scale spatial trends in diversity and community composition that are concordant with those of their eukaryotic hosts. Specifically, I investigated changes in community composition across a marine biogeographic boundary and changes in diversity along a latitudinal transect. Results showed that microbiome compositions varied significantly between geographic sites, but that the identity of the host species played a greater role than geography in determining community composition. Further, microbes associated with the California mussel, Mytilus californianus, did not show a traditional latitudinal diversity gradient, and latitudinal diversity patterns varied based on microbial group and host body site. Next, I investigated whether host-associated microbial communities vary over time and in response to environmental change in similar ways to their eukaryotic hosts. I found that over an 11-year period, and in response to environmental change, microbial communities of the bean clam, Donax gouldii, significantly differed in composition, but not in richness. Further, I found that microbes did not regularly diverge in concordance with their intertidal gastropod hosts in the ~3.5 million years since the closure of the Isthmus of Panama, though this was dependent on the host taxa and the body site from which the microbes were collected. Finally, I investigated whether current methodologies for determining the core microbiome are guided by ecological and evolutionary principles and identify critical areas for future research. Overall, this dissertation shows that large-scale patterns in host-associated microbial taxa are often context-dependent and distinct from those of their hosts.
Book Synopsis Conservation in a Changing World by : Georgina M. Mace
Download or read book Conservation in a Changing World written by Georgina M. Mace and published by Cambridge University Press. This book was released on 1999-05-10 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: As evidence for the rapid loss of biological diversity strengthens, there is widespread recognition of the need to identify priorities and techniques for conservation action that will reverse the trend. Much progress has been made in the development of quantitative methods for identifying priority areas based on what we know about species distributions, but we must now build an understanding of biological processes into conservation planning. Here, using studies at global to local scales, researchers consider how conservation planners can deal with the dynamic processes of species and their interactions with their environment in a changing world, where human impacts will continue to affect the environment in unprecedented ways. This book will be a source of inspiration for postgraduates, researchers and professionals in conservation biology, wildlife management and ecology.