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Disturbances & Succession. • Objectives. – Overview of: • Disturbances (natural and anthropogenic). • Ecological succession.Ecological succession is a series of more-or-less predictable changes that occur in a community over time. Ecosystems change over time, especially after Many different processes establish plant or animal communities in an ecosystem. Wind can blow seeds to new areas. Birds can. A: Secondary succession occurs faster because soil is already formed. O: We will describe the role of ecological succession. Ecological succession is the process by which the mix of species and habitat in an area changes over time. Gradually, these communities replace one another Primary Succession. • Soil starts to form as lichens and the forces of weather and erosion help break down rocks into smaller. Ø It is the second step in ecological succession. Ø A new species reaches the newly created bare area and they try to establish there (pioneer species). Ø The See also: ECOLOGICAL COMMUNITIES;. POPULATION ECOLOGY. The course of ecological succession depends on initial environmental conditions. Primary succession Role of succession is to make an ecosystem more sustainable/biodiverse. • Can happen in a microhabitat, like a garden being taken over with weeds. A glacier that retreats leaves behind no soil. Lava from a volcanic eruption hardens into bare rock. Primary succession begins with soil formation. The first Succession (def) – Predictable (directional) change in the composition (species abundance distribution) of an ecological community over time (e.g.,