1. TODAY: ANNOUCEMENT: 1. Learning log
G2.6 – 2.8 Succession
TODAY:
ANNOUCEMENT:
1. Learning log

2. What is succession? Series of changes to an ecosystem
Caused by complex interactions between the community of living organisms and the abiotic environment

3. Types of succession
Primary: Colonization of region where there is no pre-existing community
Secondary: Occurs where an existing community has been cleared by a disturbance that does not involve complete soil loss
Begins with no life
Follows a disturbance of the primary succession
No soil
Soil is present
New area e.g. volcanic island
Old area e.g. following a forest fire
Lichen and mosses are first plants
Seeds and roots already present
Glacier -

4. Primary succession

5. Secondary succession

6. G2.7 Change in species diversity and production
Few species  many species
Pioneer species  species that compete with others for nutrients
Little diversity  high diversity
Simple relationships  complex relationships of mutualism, competition, predation
More and more biomass (dry mass of organic matter) at each stage of succession

7. G2.8 Interactions with organism and the environment
Soils become deeper as a result of decay of plants
Allows well-draining soil
Organic matter (humus) in soil increases as a result of decay of plants
Organic matter quickly absorbs and releases water so is a good medium for plant growth
Mineral recycling increases
bacteria and fungi become more active in soils that have high organic matter
Soil erosion reduces
plant roots that stabilize the sand
Minerals added
Alder plants fix atmospheric nitrogen which leads to increase of nitrogen in the soil
Organic matter