chapter 14

chapter 14 - 1 of 2 Chapter 14 Communities: interactions of...

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1 of 2 Chapter 14 Communities: interactions of all the species in an area 1) Biodiversity: total number of different types of organisms (species) in an area a) Higher: more species b) Lower: less species 2) Extinction: total loss of species a) Causes i) Habitat destruction: man destroying habitat ii) Pollution: adding poisons, excess nutrients, etc. to the environment iii) Overharvesting: hunting, poaching, over fishing iv) Invasive/ Introduced species: species that have been added to a new place on purpose v) Habitat fragmentation: subdivision of area so that the habitats do not meet anymore 3) Saving Species a) “hot spots”: critical habitats that are now being protecting b) Endangered Species Act (ESA) (1973): protect species/habitat that have critically low numbers c) Protect species from loss of genetic variation (diversity) 4) Ecological Niche: the functional role that an organism has in the community/ ecosystem, including all aspects of the organism’s requirements (food, or “job” in community)
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This note was uploaded on 07/07/2008 for the course BIOL 115 taught by Professor Behrens during the Spring '07 term at Towson.

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chapter 14 - 1 of 2 Chapter 14 Communities: interactions of...

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