DAT World Biomes

Card Set Information

DAT World Biomes
2015-07-19 14:22:23
DAT World Biomes

Characteristics of world biomes included on the DAT
Show Answers:

  1. Desert Biomes
    • < 10 inches of rain each year
    • main growing season restricted to days after rainfall
    • small plants and animals inhabit
    • animals live in burrows (insects and lizards)
    • the plants conserve water actively (cacti, sagebrush, mesquite)
    • few birds and mammals but have developed adaptations to maintain body temp

    Examples: Sahara (Africa) and Gobi (Asia)
  2. Grassland Biome
    • 10-30 inches of rain each year
    • no shelter from herbivorous mammals from carnivores 
    • many grassland animals develop long legs and many are hoofed

    Examples: praires east of the Rockies, the steps of the Ukraine, and the pampas of Argentina
  3. Temperate Deciduous Forest Biome
    • Cold winters, warm summers, and moderate rainfall 
    • Plants: beech, maple, oaks, and willow trees (shed leaves during cold winter months)
    • Animals: deer, foxes, woodchucks, squirrels, and birds

    Examples: northeastern and central-eastern US and central europe
  4. Rainforest Biome (Tropical and Temperate)
    • "jungles" with torrential rains 
    • Tropical rainforests: high temp
    • Temperate rainforests: moderate temp
    • Climax communities with dense growth of vegetation that does not shed its leaves
    • plants: epiphytes and vines
    • animals: monkeys, lizards, snakes and birds
    • Trees grow closely together and sunlight hardly reaches the floor
    • floor contains saphrophytes

    Examples of Tropical: Central Africa, Central America, Amazon basin, and Southeast Asia

    Examples of Temperate (more rare): western North and South America and on islands off of the eastern Asian and Australian coasts.
  5. Temperate Coniferous Forest Biome
    • Cold and dry
    • inhabited mainly by trees that do not lose their leaves such as fir, pine, and spruce trees
    • vegetation adapted for water conservation
    • Found: in extreme northern part of the US and in southern Canada
    • contains the largest biomass of any terrestrial biome
    • Animals: beavers, bears, sheep, squirrels, and birds
  6. Taiga Biome
    • less rainfall than temperate forests
    • long, cold winter and are inhabited by trees that do not lose their leaves (spruce)
    • floor characterized by thin soil covered in moss and lichen 
    • Animals: moose and deer primarily (bears, wolves, rodent and birds can be found)

    Examples: extreme northern parts of Canada and Russia
  7. Tundra Biome
    • treeless, frozen plain found between taiga and northern ice sheets 
    • snow and ice covered floor (permafrost)
    • very short summer and growing season 
    • Summer: ground becomes wet and marshy
    • Lichen, moss, polar bears, musk oxen and arctic hares are found in the tundra
  8. Polar Region
    • surround the polar caps
    • frozen areas with no vegetation and few terrestrial animals 
    • animals: live near oceans including penguins and polar bears 
    • Little falling rain or snow therefore most can be considered deserts
  9. Marine Biomes

    Oceanic zone also called pelagic zone
  10. Intertidal Zone
    • Region exposed at low tides
    • undergoes variations in temperature
    • Population: algae, sponges, calms, snails, sea urchins, starfish and crabs
  11. Neritic Zone
    • contains depth up to 600 feet
    • extends several hundred miles from the shores
    • Population: (in littoral zone regions) include algae, crabs, crustaceans, and many different species of fish
  12. Pelagic (Oceanic) Zone
    • open seas 
    • divided into photic and aphotic zones
  13. Photic zone
    • sunlight layer of open sea
    • depth of 250-600 feet
    • Population: plankton, drifting masses of microscopic and heterotrophic organisms and nekton, sharks, whales, fish
    • Chief autotroph is diatom (an alga)
  14. Aphotic zone
    • region beneath photic zone that receives no sunlight
    • no photosynthesis so only heterotrophs exist here 
    • organisms have adaptations to survive in cold water with hight pressure and complete darkness 
    • Population: nekton and benthos 
    • habitat is fiercely competitive
  15. Freshwater Biomes
    • hypotonic, creating a diffusion gradient resulting of passing of water in cells 
    • organisms contain mechanisms to regularly remove water
    • Mechanisms: contractile vacuoles or protozoa and excretory systems of fish 
    • Plant have rigid cell walls that build up pressure (cell turgor) as water flows in which counteracts gradient and stops influx of water 
    • Temperature: may vary considerably (may freeze or dry up)
    • mud from floors may be stirred up by storms