Mount St. Helens. Erupted in 1980 All life destroyed What happens after that?. Ecological Succession. A series of predictable changes that occur in a community over time.
Slow changes occur after a sudden natural disaster. For example, fires or volcanoes. Can occur after human activity, like the clearing of a forest.
Lichens are usually pioneer species. Why?
Carbon enters the atmosphere through fossil fuel emissions & animal respiration.
Photosynthesis takes up CO2 from the atmosphere.
Nitrogen (N) cycles through the atmosphere, organisms, and soil.
It does not enter the atmosphere, but rather is cycled through the soil, oceans, and organisms through consumption and decomposition
An excess of a particular nutrient can cause over production of algae and plant growth.