emery_lecture_21 - Lecture 21 I. Introduction to community...

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Lecture 21 I. Introduction to community structure - community – set of coexisting and potentially interacting species - community structure – patterns of species abundance and population interactions within a community - competition, predation, mutualism - attributes: types of species present, relative abundance, vegetation characteristics, trophic relationships vs: community function – patterns of energy flow - very different from community structure - usually includes 1 thing (coral reef community, pond community) # of have a few of one dominant species and species a lot of rare species frequency class How much of a discrete unity is a community? Clemensian vs. Gleasonian 1. F.E. Clements (1916,1936): “organismic” view of communities – “superorganism” - a community is a unit 2. H.A. Gleason (1926,1936) : “individualistic” community concept; “continuum” concept - individualistic nature of species distribution - no tight ecological ideas necessarily Clements “closed” discrete communities, little transition community
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Gleason random; current view “open” community species aren’t tightly coevolved
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This note was uploaded on 04/11/2011 for the course BIO 585 taught by Professor R.howard during the Winter '08 term at Purdue University-West Lafayette.

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emery_lecture_21 - Lecture 21 I. Introduction to community...

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