GDW Tri 1 Lect 1

  • Created by: Loz1669
  • Created on: 30-12-19 16:10
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  • Global Distribution of Wildlife
    • Biodiversity: the variability among living organisms from all sources inc terrestrial marine and other aquatic ecosystems and the ecological complexes of which they are part of.
      • Biodiversity tends to be rich where it is hot and wet.
        • Hadley Cell
          • 1. Hot air rises. 2. Cool air rises and drops moisture 3. Cooler air moves North and South
        • Climate change: Dessert moves north. Prevents species from being able to relocate.
        • As you move away from equator biodiversity decreases.
        • Biodiversity is greater in lower latitude
        • Biodiversity is high in tropics and coral reefs.
        • Seasonality affects biodiversity: organisms can move and adapt to the changing seasons
        • Biodiversity hotspots: Mediterranean and Wallacia line
    • Biogeography: study of geographical patterns of plants and animals
    • Ecology: study of interactions amongst organisms.
      • Ecological Hierarchy: Biosphere, Biome, Landscape, Ecosystem, Biotic Community, Population, Organism.
      • Taxonomic: Kingdom, Phylum, Class, Order, Family, Genus, Species.
      • Physiological: Organism, organ system, organ, tissue, cell, organelle, molecule.
    • When ecosystems are measure in functional diversity (takes into account amount of species and what they eat) latitude ceases to be a major factor in biological richness.
    • Definitions:
      • Ecosystem - living and non-living in a certain area living together.
      • Biome - type of environment
      • Habitat - where an organism lives
      • Community: living components living in the same place at the same time.
      • Land cover: vegetation in a given area.
      • Land use: what use is made of that land.
      • Tolerance: species being able to adapt and tolerate conditions
      • Ecological niche: the species that live in a particular environment
    • Liebigs law of minimum
      • Total yield of any organism is determined by resource present in lowest concentration in relation to requirements of that organism.
    • Shelfords law of tolerance
      • Too much of something can impair growth and lead to death. Any organism has a range of tolerance for any factor


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