Life Processes in the Biosphere
- Created by: Aishah.a
- Created on: 30-12-12 11:33
View mindmap
- 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)
- ORGANISMS
- 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
- ORGANISMS
- 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
- HYDROSPHERE in water
- 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
- Primary succession
- 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
- POP Dynamics- affected by birth,immigration (+), death, emigration (-)
- ABIOTIC- natural, non-living
- light - energy source, UV damage skin cells ozone protects
- CARRYING CAPACITY- max a species can hold without damaging/ exploiting resources
Comments
No comments have yet been made