BIO 200 Lecture 29: Lecture 29 Guide
30 Nov 2016
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Document Summary
Symbioses: parasitism, ectoparasites vs. endoparasites, multiple hosts, mutualism, types of mutualism, the importance of stress, commensalism and ammensalism, species interactions may change over time or be hard to name, communities are interactions of species interactions, keystone species. When a species evolves due to interaction with another species. Difficult to prove that it is indeed the interaction between 2 species that"s driving evolution. When 2 or more organisms interact in a more or less permanent relationship. Interaction is long term unlike predation (too quick) or competition (not close enough) If host dies, parasite dies not good: mutualism, commensalism. Can range from viruses to bacteria to protists. Can live in host for its entire life. Can be passed from host to host child: parasites can have complex life cycles. Must infect new host before current host dies. New host can fall into 1 of 3 categories. If most of population is this, infection can spread quickly.
