Multiple Choice
Which type of ecological process first occurred in the ecosystem around Mount St. Helens after it erupted?
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48. Ecology
Introduction to Ecology
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Which of the following is an example of secondary succession?
A
The colonization of bare rock by lichens
B
The development of a coral reef in a new oceanic area
C
The formation of a new island from volcanic activity
D
A forest regrowing after a wildfire
Verified step by step guidance1
Understand the concept of ecological succession, which is the process by which the structure of a biological community evolves over time. There are two main types: primary and secondary succession.
Primary succession occurs in lifeless areas where there is no soil, such as after a lava flow or on a newly formed sand dune. It begins with the colonization of bare rock by pioneer species like lichens.
Secondary succession occurs in areas where a disturbance has destroyed a community without destroying the soil, such as after a wildfire, hurricane, or human activity like farming.
Identify the key difference: primary succession starts on bare rock or barren environments, while secondary succession starts in areas where soil is already present.
Apply this understanding to the examples given: A forest regrowing after a wildfire is an example of secondary succession because the soil remains intact, allowing plants to regrow more quickly than in primary succession.
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