Ch18 Community Structure1.pdf

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University College Courses
Spencer Barrett

BIO120H © Lis| Page 111 chapter 18: COMMUNITY STRUCTURE  Frederic E. Clements  communities are superorganisms  the functions of various species are connected and have evolved to enhance their interdependence  communities are discrete entities that can be distinguished from one another  it is aholistic conceptt (the idea that the organisms in a community form a discrete, complex unit analogous to a superorganism)  Henry A. Gleason  advocated an inindividualistic conceptf community organization (the idea that a community is not a discrete unit, but merely a fortuitous association of species whose adaptations and requirements enable them to live together under the physical and biological conditions of a particular place)  natural selection acts on the fitness of the indiv. to maximize its own reproductive success, not the benefit the community  community: an association of interacting pop. usu. defined by the nature of their interaction or the place in which they live A BIOLOGICAL COMMUNITY IS AN ASSOCIATION OF INTERACTING POPULATIONS  a community can be spatially defined, including all the pop. w/in its boundaries  Braun-Blanquet sys.: a taxonomy of communities based on a method of sampling plant species composition  places each community in a hierarchy of types when organized by thei
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