BIOC50H3 Chapter 3: BIOB50 Chapter 3 Review

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7 Feb 2012
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The american serengeti twelve centuries of change in the great plains: a case study. Great plains located in central north america is different from serengeti plain of africa. Genetically identical crop plants & few species of domesticated herbivores. Latitudinal/ elevational shifts in biological communities & species composition. Vegetation followed retreating ice northward & colonized newly exposed area. These large mammals went extinct in great plains about 10. 000-13,000 years ago. Changes in climate in extinction period were rapid. Led to changes in habitat/ food supply that negatively affected animals. Arrival of humans increases the death rate of animals (still controversial) Biosphere is zone of life on earth located between lithosphere & troposphere. Categorized by most common forms of plants distributed across large geographic areas. Categorization does not take taxonomic relationship among organisms into account. Relies on similarities in morphological responses of organisms to physical environment. Biomes in different continents show similar responses to climatic forces.

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