QCAA BIOLOGY U3T1 CH1

1.1 The diversity of species and ecosystems
1. Variety of life is known as biodiversity.
2. living (biotic) and non living organisms (abiotic)
  1. energy transferred through photosynthesis and linked through food webs.
    1. Final transformation known as body heat
1.2 Determining diversity
1. species richness
  1. the number of species present in an ecosystem
2. Relative species abundance
  1. How many species are present
3. % cover
  1. percentage of quadrat that species is occupying.
4. % frequency
  1. proportion of quadrats that contained a particular species
5. SDI
  1. a number between 0 and 1 determining diversity. 1 = infinite diversity.
1.3 comparing ecosystems
1. Spacial scale
  1. Macro level - country/continent. BIG
  2. Meso-level - names area/location
  3. Micro level - individual biome
2. Species interaction
  1. Predation
  2. competition
3. Niche - a specialised position/role
1.4 Environmental limiting factors
1. limiting - restricts an organism's ability to live there

Resource summary

	Created by Michaela Radford over 4 years ago