Changing Ecosystems
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Transcript of Changing Ecosystems
Changing Ecosystems
Human Impact on Tundra
Human Impact on Temperate Deciduous Forest
Human Impact on Temperate Rain Forest
Human Impact on Tropical Rain Forest
Human Impact on Desert
Human Impact on Grassland
Human Impact on Rivers and Streams
Human Impact on Lakes and Ponds
Human Impact on Wetlands
Human Impact on Coral Reefs
Some changes to an ecosystem are natural, some are man-made
How Ecosystems Change Naturally
What changes will you see?
Succession
• The normal, gradual changes that occur in the types of species that live in an area.
Primary Succession
• How will these areas (volcanic rock and glacial rock deposit) change?
• What will plants need to survive here?
Primary Succession
• Succession that begins in a place that previously had no soil or plants.
Pioneer Species
• First plants to inhabit an area.
• They often begin the soil building process by breaking down the rocks along with weathering and erosion.
Lichen• A common pioneer species, it produces
acid that helps weather the rock into soil.
• When it dies, it will also help fertilize the newly forming soil.
As soil forms, seeds are blown in or dropped by birds or other animals
Secondary Succession
• Succession that occurs where soil is already present.
Secondary succession occurs much faster than primary succession-Why?
Climax Community• A community of plants that is relatively
stable and undisturbed and has reached an end stage of succession. (ex-a forest)
Review
What type of succession will occur here?
• Surtsey, an island off the coast of Iceland. It was created in 1963 by a volcanic eruption.
Primary Succession
What will the first species to move in be called?
• Pioneer Species
What is a common pioneer species?
• Lichen (Like-ehn)
What type of succession will occur here?
• Secondary succession
What is the final stage of succession called?
• Climax Community