BIOB50H3 Lecture Notes - Lecture 15: Gastrointestinal Tract, Mind Control, Coevolution
7 Nov 2015
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Predators and prey interact with their environment to coexist: huffaker (1958) created a simple environment for herbivorous and predatory mites, herbivorous mites lived on oranges scattered in a tray. Predators pressure on prey even when they"re not being killed. Ectoparasites vs. endoparasites: ectoparasites live on the outside of their host. They must penetrate exterior defenses: endoparasites live in the alimentary canal or the bodily fluids of the host. Mind control parasites: many parasitoids require a way to reach their next hosts. They influence the behaviour of their host in order to reach an optimal spot for dispersal: all organisms are hosts to many parasites & pathogens. Ectoparasites of plants: phloem feeders: aphids, aphidius colemani an epiparasitoid of aphids, ustilago maydis corn smut. Endoparasites of plants: chestnut blight: fungus cryphonectria parasitica. Lyme disease: borrelia burgdorferi spirochete bacterium infected the. Parasites can cause population cycles, similar to predators.
