Chapter 46Community Structure

Chapter 46Community Structure - Chapter 46 Community...

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Unformatted text preview: Chapter 46 Community Structure and Biodiversity Community All the populations that live together in a habitat Type of habitat shapes a communitys structure Each of the species in a community has its own niche NICHE =Sum of activities and relationships in which a species engages to secure and use resources necessary for survival and reproduction Each community has its own SPECIES RICHNESS SPECIES RICHNESS = The number of species and their relative abundance Factors Shaping Community Structure Climate and topography Available foods and resources Adaptations of species in community Species interactions Arrival and disappearance of species Physical disturbances Species Interactions There is species interaction in all communities Most interactions are neutral; have no effect on either species Close associations between two or more species during part or all of its life cycle = SYMBIOSIS (5 types of symbiosis)- Commensalism helps one species and has no effect on the other- Mutualism helps both species- Interspecific competition has a negative effect on both species- Predation and - Parasitism both benefit one species at a cost to another Mutualism Both species benefit Some are obligatory; partners depend upon each other SOME EXAMPLES Yucca plants and yucca moth Example of an obligatory mutualism Each species of yucca is pollinated only by one species of moth Moth larvae can grow only in that one species of yucca Mycorrhizal fungi and plants Obligatory mutualism between fungus and plant root Fungus supplies mineral ions to root Root supplies sugars to fungus ....
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This note was uploaded on 12/02/2009 for the course SCI 013 taught by Professor Xxx during the Fall '09 term at Purdue University Calumet.

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Chapter 46Community Structure - Chapter 46 Community...

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