BIOLOGY Chapter 16: Changes In Ecosystems
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Transcript of BIOLOGY Chapter 16: Changes In Ecosystems
Changes in ecosystemsChapter 16 (Page 500)
Harm to Coral Reef
0.5ºC over next 100 years
and Arctic Ecosystems
All coral reefs bleached
1ºC over next 100 years
10% of global ecosystems transformed
Mass mortality in coral reefs
2ºC over next 100 years
1/6 of global ecosystems transformed
1/4 species committed to extinction
1/2 of nature reserves unable to meet conservation objectives
3ºC over next 100 years
1/5 of global ecosystems transformed
1/3 species committed to extinction
Could the damage be reversed?
Primary changes in ecosystems may produce a cascade of secondary changes that may not become apparent immediately.
What are the primary and secondary changes in the:
Panda example?
Temperature change example?
Frequency of change
Regular and predictable events (e.g. tides and seasons)
Sporadic (irregular) events (e.g. floods)
One-off events, planned or unpredictable (e.g. oil spill)
Examples of changes?
Activity! (20 minutes)
Split into 3 teams of 5-6 people. Each team will be given a scenario with primary change.
TASK: Create a strategic plan to restore the ecosystem back to it's original state.
In the plan you have to highlight : What is the primary change and how has it
impacted the ecosystem and the organisms that live there?
Identify the secondary changes that may occur. Can the damage be reversed? If so, how can the
balance of the ecosystem be restored?
UN Meeting on Climate Change
Primary change
Secondary changes
Can the ecosystem be restored? How?
Succession in ecosystems: The natural replacement over time of one community by another community with different dominant species.
Primary succession Secondary succession
Key ideas
Primary changes and secondary changes
Frequency of change?
Can damage of an ecosystem be reversed/restored?
Primary succession vs. Secondary succession
Invasive species Over-harvesting Fire = important
Invasive species + over-harvesting
Goats on trees found in Morocco.
Like to eat the fruit of the argan tree, which is similar to an olive
The argan tree slowly disappearing due to over-harvesting for the tree's wood and overgrazing by goats.
Interesting websites
The world’s 10 worst invasive species: http://webecoist.momtastic.com/2009/12/15/incoming-the-worlds-10-worst-invasive-species/
Invasive species specialist group: http://www.issg.org/
Invasive species database: http://www.issg.org/database/welcome/