regulation of parasite populations

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Regulation Of Parasite Populations

Author : Gerald Esch
ISBN : 9780323158633
Genre : Science
File Size : 21. 32 MB
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Regulation of Parasite Populations is composed of the proceedings of a symposium held at New Orleans, on November 10-14, 1975, and jointly sponsored by the American Microscopial Society and the American Society of Parasitologists. The symposium focuses on the literatures dealing with the regulation of parasite populations. It also introduces some concepts and notions regarding this field of interest. This book reports the five papers presented in the symposium, beginning with the concept of parasitism. It specifically explains the regulation of fish parasite populations and the role of arrested development in the regulation of nematode populations. Aside from the subject at hand, the complementary nature of laboratory work, field studies, and mathematical modeling are explained. This compilation corresponds to an effort to “bridge a gap between some of the ideas and thoughts in ecology and parasitology.

Regulation Of Parasite Populations

Author : Gerald W. Esch
ISBN : OCLC:476107054
Genre :
File Size : 37. 90 MB
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Author : Claude Combes
ISBN : 9780226114460
Genre : Medical
File Size : 65. 13 MB
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In Parasitism, Claude Combes explores the fascinating adaptations parasites have developed through their intimate interactions with their hosts. He begins with the biology of parasites—their life cycles, habitats, and different types of associations with their hosts. Next he discusses genetic interactions between hosts and parasites, and he ends with a section on the community ecology of parasites and their role in the evolution of their hosts. Throughout the book Combes enlivens his discussion with a wealth of concrete examples of host-parasite interactions.

Evolutionary Ecology Of Parasites

Author : Robert Poulin
ISBN : 1400840805
Genre : Science
File Size : 48. 60 MB
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Parasites have evolved independently in numerous animal lineages, and they now make up a considerable proportion of the biodiversity of life. Not only do they impact humans and other animals in fundamental ways, but in recent years they have become a powerful model system for the study of ecology and evolution, with practical applications in disease prevention. Here, in a thoroughly revised and updated edition of his influential earlier work, Robert Poulin provides an evolutionary ecologist's view of the biology of parasites. He sets forth a comprehensive synthesis of parasite evolutionary ecology, integrating information across scales from the features of individual parasites to the dynamics of parasite populations and the structuring of parasite communities. Evolutionary Ecology of Parasites presents an evolutionary framework for the study of parasite biology, combining theory with empirical examples for a broader understanding of why parasites are as they are and do what they do. An up-to-date synthesis of the field, the book is an ideal teaching tool for advanced courses on the subject. Pointing toward promising directions and setting a research agenda, it will also be an invaluable reference for researchers who seek to extend our knowledge of parasite ecology and evolution.

Bottom Up Regulation Of Parasite Population Densities In Freshwater Ecosystems

Author :
ISBN : OCLC:1016883169
Genre :
File Size : 56. 38 MB
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Abstract : Theory predicts the bottom–up coupling of resource and consumer densities, and epidemiological models make the same prediction for host–parasite interactions. Empirical evidence that spatial variation in local host density drives parasite population density remains scarce, however. We test the coupling of consumer (parasite) and resource (host) populations using data from 310 populations of metazoan parasites infecting invertebrates and fish in New Zealand lakes, spanning a range of transmission modes. Both parasite density (no. parasites per m 2 ) and intensity of infection (no. parasites per infected hosts) were quantified for each parasite population, and related to host density, spatial variability in host density and transmission mode (egg ingestion, contact transmission or trophic transmission). The results show that dense and temporally stable host populations are exploited by denser and more stable parasite populations. For parasites with multi‐host cycles, density of the 'source' host did not matter: only density of the current host affected parasite density at a given life stage. For contact‐transmitted parasites, intensity of infection decreased with increasing host density. Our results support the strong bottom–up coupling of consumer and resource densities, but also suggest that intraspecific competition among parasites may be weaker when hosts are abundant: high host density promotes greater parasite population density, but also reduces the number of conspecific parasites per individual host.

Natural Regulation Of Animal Populations

Author : McLaren
ISBN : 0202367452
Genre : Science
File Size : 41. 91 MB
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Surveying an area dense with conflicting observations and ideas, this volume vividly depicts the current state of knowledge as well as the great diversity of opinion in the field of population ecology. Ten papers by outstanding authorities focus on three main issues-the effects of environment and population density on population dynamics, the influence of animal behavior on population growth, and the possibilities of genetic feedback or short-term evolutionary change in control of animal populations. An incisive introduction by the editor establishes a frame of reference and supplies succinct resolutions of some of the important controversies dealt with in these pages. Choosing from a vast literature that has been polemical, often confusing, and at times acrimonious, the book offers several classic arguments that clarify the functional, statistical, and evolutionary aspects of the relationship of population density to population growth. M. E. Solomon lays the groundwork for the ensuing debate by classifying the terms and relevant concepts of "density-dependence" as they apply to population dynamics. Other probing articles questions whether the density of animal populations is actually regulated by particular mechanisms or by random chance, provide counterexamples of the regulation of animal numbers, and explore effects of population density on the growth rates of various animal populations. Aside from the negative effects or responses of the environment, including haardous weather and food shortages, increasing evidence shows that a definite social or behavioral regulation may result from the interaction of individuals or groups within the animal population. This concept, ignored by some ecologists and considered universal by others, is discussed by several of the contributors. Perhaps the most noteworthy proponent of the idea that "social regulation" is for the "purpose" of preventing overpopulation and consequent destruction of resources is V. C. Wynne-Edwards. His paper outlines a theory that has stimulated wide discussion and caused reevaluation of many established views. Ian A. McLaren is Professor emeritus, department of Biology at Dalhousie University, Halifax, Nova Scotia. His expertise is population and evolutionary biology of plankton, seals, and birds. Dr. McLaren has contributed numerous papers to books and scholarly journals in the fields of population and evolutionary ecology. Dr. McLaren is also a fellow of the Arctic Institute.

Comparative Population Regulation Among Three Species Of Hymenoptera Parasitic On Dipterous Pupae

Author : John Thompson Hayes
ISBN : CORNELL:31924018246672
Genre : Nature
File Size : 38. 25 MB
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Ecology Of Wildlife Host Parasite Interactions

Author : Bryan T. Grenfell
ISBN : 0521567440
Genre : Medical
File Size : 26. 80 MB
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This new collection of articles, edited by Bryan T. Grenfell includes: Factors affecting the evolution of virulence: nematode parasites of fig wasps; Maintenance of a microparasite infecting several host species in the Seregeti; Wildlife disease and conservation in Hawaii: pathogenicity of avian malaria (Plasmodium relictum) in experimentally infected Iiwi (Vestiaria coccinia).

Parasites And Behaviour

Author : M. V. K. Sukhdeo
ISBN : 0521485428
Genre : Medical
File Size : 79. 85 MB
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This volume of Parasitology takes an in depth look at parasitic behaviour.

Enteric Infections And Immunity

Author : Lois J. Paradise
ISBN : 0306452421
Genre : Medical
File Size : 51. 56 MB
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As we approach the end of this millennium, enteric diseases remain impor tant public health problems. In many parts of the world, sanitary measures have advanced little over the last century, although some of the governments in those areas are striving to improve facilities for sanitation and to educate their people in proper handling of food, water, sewage, and other modes of transmission of pathogenic microbes. Even in highly developed countries, outbreaks of diarrheal diseases occur today. Globally, the annual morbidity from enteric infections is estimated at several billion and deaths at several million per year. In this volume, descriptions of some of these diseases, of immunity that results from them, of clinical studies that promote under standing of individual and community immunity, of molecular factors of pathogenesis, and/or of advances in vaccine development have been pro vided by leading researchers. At present, the application of molecular methods is enhancing the identification of protective antigens of many microorganisms. In addition, new methods for design and delivery of vac cines are being devised. Perhaps then more effective tools for reducing at least some of these diseases will be available within the next decade. Lois J. Paradise Herman Friedman Mauro Bendinelli vii Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv LOIS J. PARADISE 1. Indigenous Microorganisms as a Host Defense 1 KENNETH H. WILSON 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. Composition of Intestinal Biota. . . . . . . . . . . . . . . . . . . . . . . . 2 3. Molecular Approaches to Determine Composition of the Biota . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4. Role of the Host in Determining the Composition of the Biota . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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