BIOLOGY 3SS3 Lecture 6: exploitation.complete
26 Sep 2016
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Introduction: exploitation is when interactions between two species are good for one species and bad for the other. Typically, the exploiter is taking resources from the other species: exploitation is widespread and highly diverse. Examples: antelopes graze on trees, lions eat antelopes, ticks feed on lions, swallows eat ticks, bacteria reproduce inside the swallow, viruses infect the bacteria Types of exploitation: these words are usually not used precisely, and i"m not going to test you on them. Predation: a predator kills and eats prey. Parasitism: a parasite lives on or in a host and makes use of host resources. Many parasites are pathogens, meaning that they cause dis- ease. Parasitoidism: a parasitoid develops inside a host, but must kill the host to complete development. Grazing: a grazer takes food from another organism (typically a plant), and moves on. Borderline cases: the categories listed above are useful, but not precise and not used precisely.
