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Increasing wisdom and ingenuity are required if we are to master our environment and cope with the myriad of organisms that affect our existence. Not the least of these organisms are the parasites and pathogens which can be found in all animals. The ecological implications of parasitism are obvious, and the interrelationships among different organisms within the same host are fascinating, but more knowledge and understanding are needed. The symposium are held to stimulate discussion of the significance of ecological problems presented by parasites and to develop means of attacking some of these problems. The diversity of parasitism from protozoa to anthropods was emphasized and the speakers and topics were selected to interest those in various biological disciplines and professions. Organized by the Department of Parasitology in the School of Hygiene of the University of Toronto, and held at Toronto in February 1970, the symposium was an unqualified success. The enthusiastic interest, indicated by the attendance of over three hundred people from seven countries, and numerous requests for copies of the proceedings led to the publication in this volume of the twelve papers presented at the symposium. The opening remarks of the leader of the discussion which follow each paper have been included and a complete bibliography is provided for each topic. The contributors are leading specialists in their fields; their papers present the results of the most recent research and assemble and review the scattered literature on each topic. The text is illustrated throughout with diagrams and photographs. Parasitism and associated phenomena are excellent examples of problems requiring the interdisciplinary approach taken by the symposium. The results of such an approach are useful in a wide variety of disciplines: microbiology, invertebrate zoology, entomology, and tropical medicine, as well as parasitology.

Parasites --- Host-parasite relationships

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Lost River sucker --- Mortality --- Parasites --- Effect of water quality on

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Plant health --- Plant parasites --- Agriculture --- Agriculture and state

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Parasitoids lay their eggs on or in the bodies of other species of insect, and the parasitoid larvae develop by feeding on the host, causing its eventual death. Known for a long time to applied biologists for their importance in regulating the population densities of economic pests, parasitoids have recently proven to be valuable tools in testing many aspects of evolutionary theory. This book synthesizes the work of both schools of parasitoid biology and asks how a consideration of evolutionary biology can help us understand the behavior, ecology, and diversity of the approximately one to two million species of parasitoid found on earth. After a general introduction to parasitoid natural history and taxonomy, the first part of the book treats the different components of the reproductive strategy of parasitoids: searching for a host, host selection, clutch size, and the sex ratio. Subsequent chapters discuss pathogens and non-Mendelian genetic elements that affect sexual reproduction; evolutionary aspects of the physiological interactions between parasitoid and host; mating strategies; life history theory and community ecology. A special effort is made to discuss the theoretical background to the subject, but without the use of mathematics.

Parasitic insects --- Parasitoids --- Insects --- Behavior evolution. --- Behavior. --- Behavior. --- Parasites.

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La première partie de ce travail sera une présentation générale de l'espèce Erinaceus europaeus avec son histoire et sa biologie. 
La deuxième partie consistera en une description détaillée des parasites les plus communs retrouvés chez le hérisson européen. Cette description reprendra notamment les généralités du genre mais également les particularités d'espèce de ces parasites. Une rapide approche des traitements sera également abordée. S'en suivra une comparaison avec les parasites retrouvés chez les animaux de compagnie pour analyser les risques lors de leurs contacts avec un hérisson.
La troisième et dernière partie consistera en une étude pratique. Celle-ci comprendra une récolte d'échantillons auprès du centre de revalidation de la faune sauvage de Liège, leur analyse en laboratoire et l'étude des résultats en fonction du contexte et de la littérature.

Hérisson, Erinaceus europaeus, parasites, zoonoses, chien, chat --- Sciences du vivant > Médecine vétérinaire & santé animale