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DO NOW 1.Turn in your Biome Take a Vacation assignment & your Biome Coloring Assignment. 2.How many people do you think live on earth RIGHT NOW? (give me an exact #)
DO NOW
1. Turn in your Biome Take a Vacation assignment & your Biome Coloring Assignment.
2. How many people do you think live on earth RIGHT NOW? (give me an exact #)
Biodiversity
• What is biodiversity?• Why is it important for each ecosystem to
have biodiversity?
BiodiversityBiodiversity is the degree of variation (differences) of life forms within a given species, ecosystem, biome or entire planet.
5 Ways Humans Impact Biodiversity
1. Population Growth
Human Population Growth
Population & Growth Patterns
• Change in a population size determined by: – Immigration– Emmigration– Birth – Death
Types of Population Growth
• Exponential Growth– Rapid population increase due to an abundance of
resources
Types of Population Growth
• Logistic Growth– Due to a population facing limited resources
Carrying Capacity
• The maximum number of individuals in a population that the environment can support
Population Crash• Dramatic decline in
the size of a population over a short period of time
• USUALLY happens after a population has exceeded their carrying capacity.
Human Population Through Time
How Big is a Billion – Rice Demo
2. Habitat Alteration
Habitat
• Habitat – place and conditions in which an organism lives.
What are some examples of habitat?
Small habitats within larger habitats
VideosGlacier Disappearing
Changing habitats
Habitats can change over time.
Mount St. Helens, Washington
Habitat AlterationChanges made to the environment in which
an organism lives.
Changes can be natural or man-made.Wildfires Acid Rain
Bear Glacier, Alaska
1909
Bear Glacier, Alaska
2005
Muir Glacier, Alaska
1941
Muir Glacier, Alaska
2004
Salt Lake Valley
Late 1800s
Salt Lake Valley
2000s
Gila River, Arizona
1935
Gila River, Arizona
1964
Escalante River, Utah
1953
Escalante River, Utah
1998
Coal Mine, Before Restoration
Coal Mine, After Restoration
Wetland, Before Restoration
Wetland, After Restoration
Sustainability
• Meeting the needs of the present without limiting the ability of people, other species, and future generations to meet their needs.
3. Overharvesting
• Harvesting of plants or animals in an unsustainable manner.
• Eventually, the organisms will disappear!
4. Invasive Species
• Every animal species has a native habitat• Exotic species are species that are not living in
their native habitat.• As long as the species is not harming the other
organisms, it is not considered invasive.
4. Invasive SpeciesNon-native species that threaten ecosystems,
habitats, or species
How do invasive species come to be in an area?
HUMANS!
How do invasive species affect biodiversity
• Example: Emerald Ash Borer
5. Pollution
• Pollution: The presence or introduction of a substance or thing that has harmful or poisonous effects.
