• Primary succession occurs when communities are eradicated, leaving barren rock. • In secondary succession, a disturbance leaves behind intact soil. • Examples of secondary succession include: · Fields to small shrubs to weed trees to forests · Lakes to marshes to wet fields to shrubs to trees to forests

- Review: Community-level disturbances include fire, flood, glaciers, and human activity and can lead to primary succession. - In secondary succession, an existing community is disrupted and leaves the soil intact. American settlers eliminated nearly all of the country’s virgin stands of deciduous forests.

- Each stage on the left inhibits the preexisting vegetation. The secondary succession goes from field to small shrubs to weed trees to forest. - Another example of secondary succession involves the gradual change from an oligotrophic to a eutrophic lake. An oligotrophic lake is a nutrient-poor, clear, deep lake with little phytoplankton. Over time, oligotrophic lakes fill in with sediments and nutrients, forming eutrophic lakes. When the lake becomes shallow enough, standing vegetation will grow; the region is now classified as a marsh or swamp. When the marshes fill in further, they give rise to wet fields and follow the sequence of fields to forest.

What is a climax community?

- a community that will remain stable until the next disturbance

In terms of lakes, the successional sequence is __________ to __________ to __________ to __________.

- oligotrophic lakes; eutrophic lakes; marsh; wet fields

Which of the following is a secondary disturbance?

- The American settlers eliminated nearly all the virgin stands, cutting the forest down to the soil.

14.7.2 Secondary Succession Flashcards by Irina Soloshenko

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14.7.2 Secondary Succession Flashcards

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