A pathosystem is a subsystem of an ecosystem and is defined by the phenomenon of parasitism. A plant pathosystem is one in which the host species is a plant. The parasite is any species in which the individual spends a significant part of its lifespan inhabiting one host individual and obtaining nutrients from it. The parasite may thus be an insec...
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http://en.wikipedia.org/wiki/Pathosystem
An ecological sub-system defined by the phenomenon of parasitism. A plant pathosystem may include one or more host plant species along with the various parasites - insects, fungi, bacteria etc. - that utilise the hosts. Herbivorous birds and mammals, however, are generally not classified as parasites.
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http://www.encyclo.co.uk/visitor-contributions.php
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