Question

ecological succession: 20. what are the two types of ecological succession? 21. complete the table using the information from slides #28 - 31. primary succession secondary succession how does it start? how fast does it occur? succession in the water: 22. where does primary succession take place?

Explanation:

1. Ecological succession has two main types based on the initial conditions of the environment. Primary succession starts on a newly - formed or bare substrate with no soil, like after a volcanic eruption. Secondary succession occurs in an area where a pre - existing community has been disrupted but soil remains, such as after a forest fire.
2. For primary succession, it starts on a bare rock or newly formed land with no soil. It occurs very slowly as pioneer species like lichens and mosses have to break down rock to form soil first. For secondary succession, it starts when a disturbance like a fire or flood removes the existing community but leaves soil intact. It occurs relatively faster as there are already seeds, roots, and other propagules in the soil.
3. Primary succession takes place in areas such as newly formed volcanic islands, bare rock surfaces exposed by retreating glaciers, or areas where a lava flow has completely destroyed the previous ecosystem.

Answer:

1. Primary succession, Secondary succession

21.

	Primary Succession	Secondary Succession
How fast does it occur?	Slowly	Faster

1. Newly formed volcanic islands, areas with exposed bare rock from glacier retreat, regions affected by lava flows that destroyed previous ecosystems