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Unformatted text preview: Biology 1B, Ecology Lecture 7, Page 1 Professor Resh • Spring 2009 *Assigned readings, 8 th Edition pp. 1198-2014 7 th Edition pp. 1171-1175 Communities Outline of Lecture 7 A. Views of communities B. Coevolution C. If there are so many herbivores why are there any plants left? D. Animal defenses E. Mimicry 1. Batesian 2. Mullerian F. Community diveristy G. Are all species equally important to community functioning? H. Succession types I. Successional processes (three processes) J. Richness changes during succession A. Populations of organisms that live together at a given site form a biological community. 1. One view: a chance assembly of species found in the same area because they have similar ecological requirements. 2. Another view: organisms are united in some way by ecological relationships; they influence each other’s abundance and distribution. B. Coevolution is the mutual influence that occurs in the evolution of two different species that interact with each other and reciprocally influence each other. C. If there are so many herbivores why are there any plants left? 1. Morphological and chemical defenses 2. Predators and parasites Biology 1B, Ecology Lecture 7, Page 2 Professor Resh • Spring 2009 *Assigned readings, 8 th Edition pp. 1198-2014...
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