1. Ecology
Succession

2. POINT > Describe primary succession in ecosystems
POINT > Describe secondary succession in ecosystems
POINT > Define a climax community

3. But first, WB CHECK:
Bees help flowers reproduce by spreading pollen. The bees benefit by getting energy-rich pollen and nectar. What type of symbiosis is this?
Triggerfish move large rocks on the seafloor to find food. Smaller fish, which could not move the rocks, benefit by getting new feeding opportunities. What type of symbiosis is this?
What type of symbiosis occurs when you get a mosquito bite?

4. POINT > Describe succession in ecosystems
Succession is a series of relatively predictable changes that occur in an ecosystem over time
Succession occurs after ecological disturbances or as some species die and others replace them
Review the prefixes “bio” and “a.” Review “habitat” if needed.
Examples of biotic factors: moose, shrubs, humans, dogs, flowers etc.
Examples of abiotic factors: water, soil, rocks, air, etc.

5. What is one reason succession occurs?
WB CHECK:
What is one reason succession occurs?

6. POINT > Describe primary succession in ecosystems
Primary succession occurs after a major ecological disruption in an area with no remnants of an older community (Ex. volcanic eruptions, retreating glaciers)
Review the prefixes “bio” and “a.” Review “habitat” if needed.
Examples of biotic factors: moose, shrubs, humans, dogs, flowers etc.
Examples of abiotic factors: water, soil, rocks, air, etc.

7. POINT > Describe succession in ecosystems
Primary succession begins in an area with no remnants of an older community
Pioneer species: The first species to colonize lifeless areas ex. lichen
Review the prefixes “bio” and “a.” Review “habitat” if needed.
Examples of biotic factors: moose, shrubs, humans, dogs, flowers etc.
Examples of abiotic factors: water, soil, rocks, air, etc.

8. POINT > Describe secondary succession in ecosystems
Secondary succession occurs when a disturbance disrupts an ecosystem without totally destroying it Seeds and root systems may still be present Ex. after wildfire, hurricane, flood, etc
Review the prefixes “bio” and “a.” Review “habitat” if needed.
Examples of biotic factors: moose, shrubs, humans, dogs, flowers etc.
Examples of abiotic factors: water, soil, rocks, air, etc.

9. POINT > Describe secondary succession in ecosystems
Secondary succession proceeds faster than primary succession because the soil and some species survive the disturbance
Review the prefixes “bio” and “a.” Review “habitat” if needed.
Examples of biotic factors: moose, shrubs, humans, dogs, flowers etc.
Examples of abiotic factors: water, soil, rocks, air, etc.

10. POINT > Describe secondary succession in ecosystems
Succession occurs as one organism alters the environment, and allows other species to compete for resources
For example, new grasses grow after a fire. This allows herbivores to move into the area and survive
Review the prefixes “bio” and “a.” Review “habitat” if needed.
Examples of biotic factors: moose, shrubs, humans, dogs, flowers etc.
Examples of abiotic factors: water, soil, rocks, air, etc.

11. WB CHECK: What is a pioneer species?
What type of succession would you expect after a tsunami?
Why is secondary succession faster?

12. WB CHECK:
What is the difference between primary and secondary succession?
Secondary succession takes longer to occur
Secondary succession occurs when remnants of the original ecosystem are still in place
Secondary succession occurs after an ecosystem has been completely destroyed

13. POINT > Define a climax community
A climax community is the end result of ecological succession, and can be very stable
The climax community is likely much more complex relative to that earlier in succession
Review the prefixes “bio” and “a.” Review “habitat” if needed.
Examples of biotic factors: moose, shrubs, humans, dogs, flowers etc.
Examples of abiotic factors: water, soil, rocks, air, etc.

14. POINT > Define a climax community
After natural disasters ecosystems often recover to the original climax community After human disruption (like farming) ecosystems may or may not fully recover, depending on the extent of damage
Review the prefixes “bio” and “a.” Review “habitat” if needed.
Examples of biotic factors: moose, shrubs, humans, dogs, flowers etc.
Examples of abiotic factors: water, soil, rocks, air, etc.

15. WB CHECK:
A climax community:
changes rapidly as the ecosystem changes
is dominated by pioneer species
only occurs after primary succession
can be a stable, long term ecosystem

16. Homework:
Read pages
Assess page 109 #1-2
Workbook Pages (if not completed),
Finish Exam 1 Study Guide!