1. Environmental Changes

2. Environmental Changes
Changes in environmental conditions can affect the survival of individual organisms and entire species.

3. What causes environmental change?
Natural Processes
Human Activities

4. Natural Processes

5. Human Activities

6. Short-term Changes
Change that occurs quickly and affects individuals immediately.
Weather: (What happens to plants/animals?)
Heavy rain/strong winds
Floods and blizzards
Short term changes can change the genetic makeup of population.
Following a short term change, which traits are passed on to the next generation?

7. Long-term Changes
Environmental change that occurs slowly over time and affects populations gradually.
Can permanently alter an ecosystem
Over time may cause some genetic variations to become more favorable or less favorable in the new environment.
If adaptations to the new environment are not present or do not develop, populations can become extinct.
“Adapt or Die!”

8. Examples of Long-Term Changes
Higher Temperatures
Arctic sea ice
Polar bear populations
Melting of permafrost
Community of plant/insect populations in Tundra biome
Organisms’ Behaviors
Migratory birds
Caribou

23. Flip Chart Time!
Create a 2 panel flip chart that compares Natural Processes and Human Activities to long- and short-term environmental changes.
Use all of the following terms and phrases in your flip chart.

24. Climate Change
Commercial fishing
Drought
Hurricane
Farming
Burning fossil fuels
Floods
Logging
Ice Age
Volcanic eruptions
Earthquakes
Building dams
Seasons
Oil Spill
Forest Fire
Construction
Lightning

25. Questions
Glue LT/ST chart in journal and complete. Answer questions 1-6 on your SPM sheet.

26. Natural Selection
Natural selection - individuals better adapted to the environment are able to survive & reproduce.
A.K.A. “Survival of the fittest”

27. Peppered Moth Example

29. Evolution in the Galapagos
Start video at 5:45

30. Write the following and answer in your journal.
Name 2 long- or short-term environmental changes that might affect the finches and traits in subsequent populations.
How do these environmental changes affect the finches and traits in subsequent populations?

31. Selective Breeding
Selective Breeding - is the process of breeding plants and animals for particular genetic traits.
Which of the following examples best reflects selective breeding?
A. The mating of two particular sheep to produce thicker wool
B. A genetic mutation in an individual snake that improves its sense of smell compared to others in its population
C. A few individuals of an extinct species live in zoos
D. Two wolf packs live in geographically separate regions

32. Primary Succession Begins in a place without any soil
Sides of volcanoes
Soil starts to form as lichens and the forces of weather and erosion help break down rocks into smaller pieces
Called PIONEER SPECIES

33. Primary Succession

34. Secondary Succession
Begins in a place that already has soil and was once the home of living organisms
Occurs faster and has different pioneer species than primary succession
Example: after forest fires

35. Secondary Succession

36. Based on the observation data and key below, what is the correct identification for the three arachnids?