2Definition:Natural, gradual changes in types of species living in area; can be primary or secondarySuccession based on changes in plant communities over time.
3Primary Succession Begins in place w/o soil Sides of volcanoes where lava flow has occurred.LandslidesFloodingStep 1: Starts w/ arrival of living things (ex: lichens) - do not need soil to surviveCalled PIONEER SPECIES
5Primary Succession Step 2: Soil starts to form Weathering & erosion break down rocks into smaller piecesLichens die & decompose - adding small amounts of organic matter (N,P,C) to the rock to make soil
13Secondary SuccessionBegins in a place that already has soil and was once the home of living organismsOccurs faster because the land doesn’t have to build up the soil.has different pioneer species than primary successionVery often occurs after natural disasters such as forest fires, volcanic eruptions involving the spewing of ash.
14The Cedar Wildfire was the biggest wildfire in California The Cedar Wildfire was the biggest wildfire in California. It was ignited was caused by a hunter when he lit a flammable shrub called chapparral. These fires burned down about 280,000 acres of land.2 years after the fire…..