succession-population density
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Succession-Population Density. Building a ecosystem and how crowded it gets. Ecosystems are always changing due to natural and human disturbances. As things change old inhabitants die out and new organisms move in. - PowerPoint PPT PresentationTRANSCRIPT
Succession-Population Density
Building a ecosystem and how crowded it gets.
Ecological Succession
• Ecosystems are always changing due to natural and human disturbances. As things change old inhabitants die out and new organisms move in.
• When these changes are done in a predictable pattern it is called ecological succession.
Ecological Succession
• What would happen to your yard if you didn’t mow it for a month?
• For a year?
• For ten years?
Ecological Succession
Ecological Succession
• On land when succession occurs where there is no soil (after a volcano erupts or a glacier melts) it is called primary succession.
Ecological Succession
• On land when succession occurs where there is no soil (after a volcano erupts or a glacier melts) it is called primary succession.
Ecological Succession
• The first species to populate these areas are called pioneer species.
• (often lichen)
Ecological Succession
• Restoration of an ecosystem to its original condition after a major disturbance (fire, farming) is called secondary succession.
• What do you think will happen to area of the BWCA that suffered the massive blown down from straight line winds?
• Will it ever return to the state it was before the storm came through?
Population Density
• Population density = number of individuals per unit area
Population Density
• All of the people who have birthdays in October move to the south side of the room. Everyone else move to the north side of the room.
Population Density
• All of the people who have birthdays in October move to the south side of the room. Everyone else move to the north side of the room.
• North side is considered high density
• South side is considered low density
Population Density
• Which side of the room would have to compete more for resources?
• How would this affect an organism?
Population Density
• Lets allow the summer birthdays to immigrate into the south side.
Population Density
• Lets allow the summer birthdays to immigrate into the south side.
• Immigration is the movement of more individuals into an area
• Emigration is the movement of individuals out of an area.