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COMMUNITY ECOLOGY cont

COMMUNITY ECOLOGY cont. pp. 405-410. Species (organism) Population Community (interaction of different species) Ecosystem Biosphere. PROPERTIES OF A COMMUNITY. Species Richness Species evenness Species- Area Effect. Species Richness : # of different types of species

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COMMUNITY ECOLOGY cont

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  1. COMMUNITY ECOLOGY cont pp. 405-410

  2. Species (organism) Population Community (interaction of different species) Ecosystem Biosphere

  3. PROPERTIES OF A COMMUNITY • Species Richness • Species evenness • Species- Area Effect

  4. Species Richness: # of different types of species • varies with latitude (closer to equator the more species) • more sun, better climate stability

  5. Species evenness: the abundance of each species

  6. ↑species richness and ↑ evenness: ↑stability (ability to withstand disturbances in the ecosystem)

  7. Species- Areas Effect: larger areas contain more species than smaller areas

  8. KEYSTONE SPECIES • most dominant species in the community • Dictates community structure • Demonstrated by removal of keystone species from community What would happen to the species richness if the keystone species is removed from the ecosystem?

  9. SUCCESSION • Sequential and gradual growth of a community • Two types: primary and secondary

  10. Primary succession occurs when land is first formed. 1. Microbes, lichens and mosses must create soil before other plants can grow. 2. Pioneer species: first species to dominate early in succession (small and fast growing)

  11. Secondary succession occurs when succession must start over after the destruction of a climax community (marked by the domination of long-lived species and great diversity). - takes place on sites that have already supported life

  12. Homework • Read pp 405-410 • P 410 #1-5, 8 • Worksheet #5

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