Environmental Changes8.11c

Environmental Changes

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

What causes environmental change?

Natural Processes Human Activities

Natural Processes

Human Activities

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?

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!”

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

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.

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

Questions

Glue LT/ST chart in journal and complete.

Answer questions 1-6 on your SPM sheet.

Natural Selection Natural selection -

individuals better adapted to the environment are able to survive & reproduce.

A.K.A. “Survival of the fittest”

Peppered Moth Example http://peppermoths.weebly.com/

Evolution in the Galapagos https://

www.youtube.com/watch?v=n3265bno2X0

Start video at 5:45

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?

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

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

Primary Succession

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

Secondary Succession

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