Question

List one example of what needs to occur first before a secondary succession.

Answer 1

Primary succession must occur first, involving pioneer species and soil formation, before secondary succession can take place.

Step-by-step explanation:

1. In order for a secondary succession to occur, a primary succession must have taken place first. Primary succession refers to the colonization and establishment of life in an area that was previously devoid of any significant life forms, such as in the aftermath of a volcanic eruption or the formation of a new island. During primary succession, pioneer species like lichens and mosses gradually break down rocks and begin to create soil.
2. Once soil has been established, it provides a suitable environment for other plant species to grow. These plants, known as intermediate species, assist in further soil development and gradually transform the landscape. Over time, the presence of intermediate species creates more favorable conditions for larger plants to establish themselves.
3. Only after the establishment of soil and the growth of intermediate species can secondary succession take place. Secondary succession occurs when a disturbance, such as a fire or the clearing of land, disrupts an existing ecosystem, but leaves the soil intact. The disturbed area is then colonized by a series of plant species, often starting with fast-growing species like grasses and shrubs, followed by larger trees and eventually a more stable community.

Learn more about The occurrence of primary succession before secondary succession in ecology