Studies of the Effects of Spatial Heterogeneity in Nutrient Supply on Plants and Their Populations PDF Download

Author: Kieron James Day
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author:
Publisher: Academic Press
ISBN: 0323139272
Category : Science
Languages : en
Pages : 449

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There is a new emerging interest in the effects of gaps and patches on succession and biodiversity. This innovative volume is a synthesis of studies of plant responses to temporal and spatial heterogeneity, the exploitation of resources from pulses and patches by plants, and their competition with neighbors in the face of this variability.Aboveground, the book focuses upon the nature of canopy patchiness, consequences of this heterogeneity for the light environment, and the mechanisms by which plants respond to and exploit this patchiness. Belowground, the text explores the heterogeneity of soil environments and how root systems obtain nutrients and water in the context of this temporal and spatial variability. As a new reference in an evolving and growing field, this text is sure to be a valuable tool for researchers and advanced students in plant physiology, ecology, agronomy, and forestry alike.

Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 650

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Theses on any subject submitted by the academic libraries in the UK and Ireland.

Author: William Carroll Wetzel
Publisher:
ISBN: 9781321807660
Category :
Languages : en
Pages :

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Heterogeneity in herbivore density and feeding among plants is a ubiquitous feature of plant-herbivore systems. This variability has inspired generations of scientists, but modern ecology focuses on mean values of predictor and response variables. The result is that, for many ecological processes including herbivory, we have a poor understanding of the consequences of variability. This dissertation explores the consequences of heterogeneity in plants for the performance and behavior of individual herbivores, dynamics of herbivore populations, and patterns of plant-associated arthropod communities. Chapter one and two examine individual and population consequences of plant variability using Eutreta diana, a gall-making tephritid, on its host-plant, big sagebrush (Artemisia tridentata). Chapter one uses spatially explicit sampling to characterize spatiotemporal patterns of E. diana abundances. This chapter links those patterns to high heterogeneity in the strength of E. diana density-dependence among sagebrush individuals using a density-manipulation experiment in a natural population. Chapter two examines the relationship between the heterogeneity in E. diana density-dependence and E. diana oviposition behavior using a field experiment and laboratory behavioral assays. Chapter three reveals the influence of oak apple galls, formed by the California gall wasp (Andricus quercuscalifornicus), on the arthropod community on valley oak (Quercus lobata). This chapter uses a field experiment to show how heterogeneity in abundances of the gall wasp, mediated by plant quality differences, indirectly changes the structure of arthropod communities. Collectively, this work highlights the multi-scale ecological consequences of variability in plant traits.

Author: Chunhua Liu
Publisher: Frontiers Media SA
ISBN: 2889637972
Category :
Languages : en
Pages : 239

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Aquatic plants refer to a diverse group of aquatic photosynthetic organisms large enough to be seem with the naked eye, and the vegetative parts of which actively grow either permanently or periodically (for at least several weeks each year) submerged below, floating on, or growing up through the water surface. These include aquatic vascular plants, aquatic mosses and some larger algae. Aquatic plants are grouped into life forms, each of which relates differently to limiting factors and has distinct ecological functions in aquatic ecosystems. Life form groups include emergent macrophytes (plants that are rooted in sediment or soils that are periodically inundated, with all other structures extending into the air), floating-leaved macrophytes (rooted plants with leaves that float on the water surface), submersed macrophytes (rooted plants growing completely submerged), free submerged macrophytes (which are not rooted but attached to other macrophytes or submerged structures) and free-floating macrophytes (plants that float on the water surface). Aquatic plants play an important role in the structure and function of aquatic ecosystems by altering water movement regimes, providing shelter and refuge and serving as a food source. In addition, aquatic plants produce large standing crops which can also stabilize sediments, accumulate large amounts of nutrients thus improving water healthy. Thus, because of their ecological role, aquatic plants are an important component of aquatic ecosystems. Aquatic plants are very vulnerable to human activities and global changes, and many species of the plants had become endangered in the past several decades due to habitat loss, flooding, damming, over foraging, biological invasion and eutrophication, which might not be halted but enforced in the future when more extreme weathers coincide with enhanced human activities.

Author: Ana Sofia Vaz
Publisher: Frontiers Media SA
ISBN: 2889716406
Category : Science
Languages : en
Pages : 217

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Author: David Aplin
Publisher:
ISBN:
Category :
Languages : en
Pages : 185

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Author: David J. Gibson
Publisher: Oxford University Press
ISBN: 019967146X
Category : Science
Languages : en
Pages : 319

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This second edition provides authoritative guidance on research methodology for plant population ecology. Practical advice is provided to assist senior undergraduates and post-graduate students, and all researchers, design their own field and greenhouse experiments and establish a research programme in plant population ecology.

Author: Alan Hastings
Publisher: Univ of California Press
ISBN: 0520269659
Category : Nature
Languages : en
Pages : 848

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"A bold and successful attempt to illustrate the theoretical foundations of all of the subdisciplines of ecology, including basic and applied, and extending through biophysical, population, community, and ecosystem ecology. Encyclopedia of Theoretical Ecology is a compendium of clear and concise essays by the intellectual leaders across this vast breadth of knowledge."--Harold Mooney, Stanford University "A remarkable and indispensable reference work that also is flexible enough to provide essential readings for a wide variety of courses. A masterful collection of authoritative papers that convey the rich and fundamental nature of modern theoretical ecology."--Simon A. Levin, Princeton University "Theoretical ecologists exercise their imaginations to make sense of the astounding complexity of both real and possible ecosystems. Imagining a real or possible topic left out of the Encyclopedia of Theoretical Ecology has proven just as challenging. This comprehensive compendium demonstrates that theoretical ecology has become a mature science, and the volume will serve as the foundation for future creativity in this area."--Fred Adler, University of Utah "The editors have assembled an outstanding group of contributors who are a great match for their topics. Sometimes the author is a key, authoritative figure in a field; and at other times, the author has enough distance to convey all sides of a subject. The next time you need to introduce ecology students to a theoretical topic, you'll be glad to have this encyclopedia on your bookshelf."--Stephen Ellner, Cornell University “Everything you wanted to know about theoretical ecology, and much that you didn’t know you needed to know but will now! Alan Hastings and Louis Gross have done us a great service by bringing together in very accessible form a huge amount of information about a broad, complicated, and expanding field.”--Daniel Simberloff, University of Tennessee, Knoxville

Author: Melissa Kay McCormick
Publisher:
ISBN:
Category : Danthonia
Languages : en
Pages : 320

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