Life Processes in the Biosphere

  • Created by: Aishah.a
  • Created on: 30-12-12 11:33
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  • Life Processes in the Biosphere
    • ABIOTIC- natural, non-living
      • temp -  low= no enzymes, high= denature
      • light - energy source, UV damage skin cells ozone protects
      • pH - exposed living tissue- damaged, plants only grow in certain pH
      • H2O -  habitat and provides moist conditions for frogs
      • turbulence- adapt- flexibility thin leaves
      • mineral nutrients
    • BIOTIC-  affect organism, living
      • pollination - low pop densities adapted to have flowers, wind - small seeds, in faeces
      • symbiotic nutrition - 2 orgs living alongside each other benefitting
      • disease- nat controls pop eliminates weak- stronger species
      • avoiding predators- bad taste, toxins, camouflage,
      • nutrient supply- detritus feeders, decomposers recycle dead matter, food source
      • feeding - high plant productivity= species live together
    • Taxonomy (group orgs & env)
        • Taxonomy- study of grouping org
        • Species- group of similar orgs
        • Pop-  all individuals of a species in an area
        • Community- all pops of ALL species in an area
      • ENV
        • Ecosystem- community of an area + interations with it
        • Ecological niche- role of org, interactions in the ecosystem
        • Biome -  geographical region with particular climatic features
        • Habitat- org lives, part of ecosystem
        • Biosphere - inhabited by living orgs- land, water, soil & atmosphere
    • Changes in the ecosystem
      • Primary succession
        • HYDROSPHERE in water
          • - algae grow- fresh water   - rooted/ floating plants             -more plants= more animals - sediment fills lake       - rooted plants + emergent        - Aquatic life disappears     - large trees dominate
        • LITHOSPHERE on bare rock
          • - harsh= autotrophs make own food               -organic matter build up=mosses     -soil formation= grass             -inc soil= dec severity abiotic conditions     -less hardy plants colonise- flowering                - soil factors improve
        • As species colonise, abiotic factors change, & more species colonise
      • SECONDARY change after climax community has been established
        • Human act / nat disaster removes climax community(CC)                             - Succession begins, happens more quickly
        • PLAGIOCLIMAX - Human actv. cont. after CC has been removed   -Human actv. prevents 2ndary succession, maintains semi nat ecosystem
          • Human actv. stops 2ndary succession will happen- can eliminate any important species of the plagioclimax
    • Diversity& ecological stability
      • POP Dynamics-  affected by birth,immigration (+), death, emigration (-)
        • Affecting birth                           - biotic right amount of young. not enough to damage resource
        • Affecting death rate                          -density independent factors- not influenced by pop                                    -density dependent-directly affected by pop
      • POP Regulation
        • Carrying Capacity - reg pop as DD factors become stronger if pop exceeds CC       -weaker = falls below CC           STABILITY
        • Predator prey relationship- prey is plenty= predeator # inc after LAG time                                       -Prey # dec after sim LAG time                                              REGULATING POP
        • Artificial pop control - culling               -nat controll mecanisms (predator) no longer availible
  • light - energy source, UV damage skin cells ozone protects
  • CARRYING CAPACITY- max a species can hold without damaging/ exploiting resources


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