BIOLOGY 2F03 Chapter Notes - Chapter 14: Flour Beetle, Caddisfly, Red Fox

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Herbivores consume plants but don"t usually kill plant. Parasites live on the tissues within the host, reducing their fitness. Parasitoid, an insect whose larva consumes the host and kills it in the process. Exploitative interactions weave populations into a web of relationships that defy easy generalization. Parasites manipulating host behavior: some species alter the behavior of animals they exploit. Alter behavior to benefit transmission of the parasite. Acanthocephalans change behavior of amphipods in a way so that they are more likely to be eaten so that the life cycle can be completed. They induce positive phototaxis, a behavior which puts the amphipods on the surface of the lake, making them more likely to be eaten. Transmission to the host as well as size may be a faction. Infected some and some not, then mixed, parasite puts it in less sheltered environment and more out in the open. Birds more likely to eat infected individuals.

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