Community structure and dynamics

Community structure and dynamics - Community structure...

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6/4/11 Community structure
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6/4/11 Overview The concept of the community 6 How delineated are communities? Closed vs. open. 6 Studying communities 6 Quantifying community structure: species diversity
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6/4/11 What is a ‘community’ Definition : A community is defined as an assemblage of species living close enough together for potential interaction.
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6/4/11 …they are often named after their most obvious members or physical Ponderosa pine community Riparian forest community Deciduous forest community
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6/4/11 The Community View of Clements (1874-1945) saw the community as a superorganism in which the functions of various species are connected like the parts of the body. 6 Clements’s view included the following ideas: that component species had coevolved so as to enhance their interdependent
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6/4/11 The Community View of Gleason ( 1882-1975) saw the community as a fortuitous association of species whose adaptations and requirements enable them to live together under the particular conditions of a particular place. 6 Gleason’s view included the following ideas:
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6/4/11 Diverse Concepts of The holistic concept of Clements and others recognizes that we can only understand each species in terms of its contributions to the dynamics of the entire system. 6 The individualistic concept of Gleason and others recognizes that community structure and function simply express the interactions of individual species, and do
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6/4/11 Community Concepts - A An intermediate or mixed view of communities also exists, which: accepts the individualistic view that most interactions are antagonistic and that communities are haphazard assemblages of species accepts the holistic premise that some attributes of communities arise from interactions among species, reinforced through coevolution
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6/4/11 A Natural Unit of Ecological The holistic view of communities predicts a closed community : the distributions of species are coincident the boundaries between communities ( ecotones ) are distinct 6 The individualistic view of communities predicts an open community : the distributions of species are independent
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6/4/11 Closed
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Ecotones Ecotones form at the boundaries between closed communities, where species reach the edges of their distribution 6 They may contain representatives of both bordering communities, as well as unique species. 6
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Community structure and dynamics - Community structure...

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