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2011-10-20 01:29:03
biology geography

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  1. Competitive Exclusion Principle ( need to remember identical niches)
    the theory that species with identical niches cannot exist in the same geogrpahic region because one would eventually drive the other to extinction
  2. Lotka (need to remember the cyclic fluctuations and interaction)
    a mathematical model that relates cyclic fluctuations in the size of predator and prey populations to the interaction between the predators and prey themselves
  3. Alpha/Beta Diversity
    • alpha
    • the degree of difference between species found on different sites of the same habitat or community type
    • beta
    • the degree of difference in the species composition (makeup) between two different habitats or community types
  4. dominance type
    plant associations that are defined and described on the basis of the one or several plant species that structurally dominate them
  5. Niche (need to remember resource space)
    the multidimentional resource space in which a species exists
  6. Symbiosis (def)
    the close association between two species that generally develops through coevolution. in many cases, the association is obligatory for the survival of one or both species
  7. intra vs inter
    intra = within the same species

    inter = different species
  8. tolerance/inhibition model
    • Tolerance
    • In many instances, species of both early and late seral stages are estabilished very quickly following disturbance. The plants that dominate the early successional period simply are those that grow the fastest. The slower growing plants that dominate the later stages eventually displace the early dominants. All of the species can tolerate the early successional environments, but as the succession progresses, some of the early dominants can no longer tolerate the increased competition for light and moisture.
    • Inhibition
    • In some ecosystems, particularry following small disturbances, it is very difficult to predict which species will invade and eventually dominate a site. It appears that proximty to seed sources and chance factors related to seed dispersal play a major role in determining which species the site. Once the site is occupied, the presence of the early invaders inhibits establishment of other species.
  9. ecological function of classifying biomes
    • function (deciduous,boreal)
    • complex diversity
    • productivity (amount of carbohydrates being produced)
  10. numbers of orbit/tilt/e and s
    • orbit
    • every 100,000 years
    • ecentric every 50, 000
    • sphere every 50, 000
    • tilt
    • every 42,000 years
    • e/s
    • every 23,000 years
    • changes four times; every 5,000 years