how ecosystems change primary succession occurs on a surface where no ecosystem existed before...
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How Ecosystems Change• Primary Succession occurs
on a surface where no ecosystem existed before
• Secondary Succession occurs where an ecosystem previously existed—pioneer species, climax community
View 33 slides on Internet
• http://www.authorstream.com/Presentation/ranirajendran-1483170-ecological-succession/
Primary Succession
Ecological Succession
Secondary Succession
• Mt St. Helen’s June 17, 1984
Secondary Succession
• Mt. St. Helen’s August 20, 2013
Pioneer and Niche Species
Pioneer species are generally small hardy species that spread into un-colonized areas.
They are often perennial species that spread quickly, die off each season and leave behind a large amount of seeds for the next season.
Niche species are larger more complex organisms that live longer and interact with the surrounding environment more.
Niche species fill a biological gap where their specific traits suit their needs for survival without infringing on other species needs.
Climax Communities
• When a barren area has been sufficiently occupied and prepared by pioneer species, the landscape develops into a climax community
• Succession continues to very the biotic landscape as organisms co-evolve and adapt to the equalized state.
Old Field Succession
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