During the past two decades, there has been a gradual change of emphasis in ecological studies directed at unravelling the complexity of natural communities.
Author: Paul Giller
Publisher: Springer Science & Business Media
During the past two decades, there has been a gradual change of emphasis in ecological studies directed at unravelling the complexity of natural communities. Initially, the population approach was used, where interest lay in the way individual populations change and in the identification of factors af fecting these changes. A good understanding of the dynamics of single populations is now emerging, but this has not been a very fruitful approach at the community level. In the natural world, few species can be treated as isolated populations, as most single species are the interacting parts of multispecies systems. This has led to a community approach, involving the study of interrelationships between species within com munities and investigation of the actual organization of natural communities as a whole. The formalization of a number of new concepts and ideas has evolved from this approach, including niche theory, resource allocation, guild structure, limiting similarity, niche width and overlap etc. , which, until fairly recently, have been examined mainly from a theoretical point of view. However, a wealth of field data is gradually being added to the literature, especially from the general areas of island biogeography and resource partitioning amongst closely related species. Community structure embodies patterns of resource allocation and spatial and temporal abundance of species of the community, as well a. '1 community level properties such as trophic levels, succession, nutrient cycling etc.
5.7 Niche Relationships and Community Structure Clearly the various characteristics of the niche, the limits to ... the fundamentals of niche structure may allow us to draw a number of conclusions about the way in which communities may ...
Author: Rory Putman
Publisher: Springer Science & Business Media
As Ecology teachers ourselves we have become increasingly aware of the lack of a single comprehensive textbook of Ecvlogy which we can recommend unreservedly to our students. While general, review texts are readily available in other fields, recent publications in Ecology have tended for the most part to be small, specialised works on single aspects of the subject. Such general texts as are available are often rather too detailed and, in addition, tend to be somewhat biased towards one aspect of the discipline or another and are thus not truly balanced syntheses of current knowledge. Ecology is, in addition, a rapidly developing subject: new information is being gathered all the time on a variety of key questions; new approaches and techniques open up whole new areas of research and establish new principles. Already things have changed radically since the early '70s and we feel there is a need for an up to date student text that will include some of this newer material. We have tried, therefore, to create a text that will review all the major principles and tenets within the whole field of Ecology, presenting the generally accepted theories and fundamentals and reviewing carefully the evidence on which such principles have been founded. While recent developments in ecological thought are emphasised, we hope that these will not dominate the material to the extent where the older-established principles are ignored or overlooked.
4.5 IMPLICATIONS OF NICHE DYNAMICS FOR COMMUNITY STRUCTURE : NICHE PACKING The conceptual simplicity of niche theory and the relative ease with which niche relationships could be modelled and explored , together with the traditionally ...
Author: R.J. Putman
Publisher: Springer Science & Business Media
"Chapter 1 establishes the context of such a search for pattern, presenting essential definitions and exploring early work on community structure and organization. The various biotic and abiotic factors which may influence communities and their dynamics are reviewed in Chapter 2, while the way in which the interrelationships between organisms are structured within the community in food webs or in the partitioning of available resources are considered in separate chapters on food webs, niche relationships and species guilds. Later chapters explore the factors determining the assembly of communities, species composition and pattern of relative abundance and the relative roles of deterministic and stochastic processes in determining community structure. The concluding section explores the implications of observed patterns of structure and organization for stability. The mathematical analyses which are an essential component of this topic are included only where essential for understanding and are presented in special box features. Each mathematical section has been carefully structured and fully explained in biological terms. Community Ecology presents a refreshingly readable course text for advanced undergraduates in ecology."--BOOK JACKET.
Historical processes that structure communities include the constraints on diversification imposed by biogeography ... If the assumption of phylogenetic niche conservatism is justified, then the differences between two organisms' traits ...
Author: Diana Reid Nemergut
Publisher: Frontiers E-books
Category: Electronic book
The causes and consequences of differences in microbial community structure, defined here as the relative proportions of rare and abundant organisms within a community, are poorly understood. Articles in “The Causes and Consequences of Microbial Community Structure”, use empirical or modeling approaches as well as literature reviews to enrich our mechanistic understanding of the controls over the relationship between community structure and ecosystem processes. Specifically, authors address the role of trait distributions and tradeoffs, species-species interactions, evolutionary dynamics, community assembly processes and physical controls in affecting ‘who’s there’ and ‘what they are doing.’
In the context of unravelling community structure, the concept of niche is highly relevant in the analysis of species abundance patterns (Section V). Thus particular attention is given to the development of niche-oriented models with a ...
Publisher: Academic Press
The six articles in this issue of Advances in Ecological Research cover a wide spectrum of ecology to ecology to munities, the discussion of vegetation change on a longer time scale, and the significance of conservation, especially in the industrialized world. S.J. Hall and D.G. Raff provide something of interest to all ecologists. Several common themes are presented in this volume including the dynamics of communities with such examples as Glacier Bat and Mount St.Helens. * SPECIAL FEATURES: * Lively selection of review on topical subjects.
published: 17 June 2022 doi: 10.3389/fevo.2022.863080 Effects of Habitat and Competition on Niche Partitioning and Community Structure in Neotropical Ants Alex Salas-López1*†, Cyrille Violle2, François Munoz3, Florian Menzel4 and Jérôme ...
Author: James Vanderbeek RemsenPublish On: 1991-01-01
NICHE - OVERLAP MECHANISM The niche - overlap mechanism is represented schematically in Figure 19 , where niche over- lap ... If competition does not influence community structure , then niche - overlap values should no show consistent ...
Author: James Vanderbeek Remsen
Publisher: Univ of California Press
To determine the mechanisms for species-spacing in a group of closely related bird species--namely, five species of Neotropical Kingfishers--the author studied their feeding behavior and diet at three sites, two in Bolivia and one in Colombia. He found that changes in number of coexisting species were correlated with changes in abundance and size distribution of their prey, surface-dwelling fishes.
There are at least two mechanisms by which community structure affects the stability or variability of a community. The first mechanism involves ... 8.2 HABITAT AND NICHE Any position specially adapted to its occupants is called niche.
Author: Agarwal V.K.
Publisher: S. Chand Publishing
This textbook has been designed to meet the needs of B.Sc. (Hons.) First Semester students of Zoology as per the UGC Choice Based Credit System (CBCS). Comprehensively written, it explains the essential principles, processes and methodology of Acoelomate Non-Chordates along with Protista, and Ecology. This textbook is profusely illustrated with well-drawn labelled diagrams, not only to supplement the descriptions, but also for sound understanding of the concepts.
Producing Structure in Natural Communities : a Model and Evidence from Field Experiments Introduction Community Structure and Niche Theory If a local assemblage of organisms is to be regarded as a community with some degree of ...
Author: Martin L. Cody
Publisher: Harvard University Press
The evolution of species abundance and diversity; Competitive strategies of resource allocation; Community structure; Outlook.
COMMUNITY STRUCTURE AND FOOD NICHE COMMUNITY STRUCTURE AND FOOD NICHE COMMUNITY STRUCTURE AND FOOD NICHE COMMUNITY STRUCTURE AND FOOD NICHE ... Yet, little is known about the ecology and community dynamics of African forest shrews.