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'n Ekologiese benadering tot die konsep van parasitisme

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dc.contributor.author Van As, J. G.
dc.date.accessioned 2009-02-23T10:06:04Z
dc.date.available 2009-02-23T10:06:04Z
dc.date.issued 2009-02-23T10:06:04Z
dc.identifier.uri http://hdl.handle.net/10210/2143
dc.description Inaugural lecture--Department of Zoology, Rand Afrikaans University, 27 May 1986 en
dc.description.abstract The existing definitions of parasitism revolve around two elements, i.e. damage to and feeding on a host. These two elements are, however, inadequate to explain the phenomenon of parasitism, since they are in certain respects, too inclusive and in other respects too exclusive. Parasitism is an ecological concept, a form of interspecies association where small animals occupy the micro-habitats and niches on other life forms. The role of parasites in an ecosystem is discussed and elucidated by examples from an aquatic environment. Parasitic animals can be divided into different categories, based on the particular form of interspecies interaction. These categories are facultative parasitism, pseudo-parasitism, temporary parasitism, periodic parasitism and permanent parasitism. These types of host/parasite associations are discussed by means of different examples. A hypothesis on the origin of these associations is formulated: parasite/host association can originate either by a niche shift, or by a micro-habitat shift. It is further postulated that parasite/host associations do not develop due to an evolutionary association between the parasite and the particular host, but rather to an association between the parasite and the particular niche. Specialization in parasites is therefore aimed at niche reservation in order to eliminate inter- and intra-species competition. en
dc.language.iso afr en
dc.rights University of Johannesburg en
dc.subject Parasites en
dc.subject Pseudo-parasitism en
dc.subject Temporary parasitism en
dc.subject Permanent parasitism en
dc.subject Periodic parasitism en
dc.title 'n Ekologiese benadering tot die konsep van parasitisme en
dc.title.alternative An ecological approach to the concept of parasitism en
dc.type Inaugural en

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