The Slow Recovery of Ecosystems
Ecological succession is nature's process of rebuilding biological communities after disturbance. Whether following a volcanic eruption, forest fire, or glacier retreat, ecosystems pass through a predictable sequence of stages — from bare ground colonized by hardy pioneer species to complex mature communities. This simulation lets you watch this multi-decade process unfold by dragging the time slider through centuries of ecosystem development.
Stages of Succession
The process begins with pioneer species: lichens, mosses, and fast-growing annuals that tolerate harsh conditions and poor soil. These early colonizers begin building soil organic matter, trapping moisture, and moderating microclimate. Within decades, grasses and shrubs replace pioneers, creating shade and competition. Eventually, shade-tolerant tree species establish and grow to form a canopy, creating the final climax community.
Biodiversity Through Succession
Species diversity follows a characteristic hump-shaped curve during succession. The early bare stage has few species. Diversity rises rapidly during the pioneer and shrub stages as new species colonize. It peaks during the transition to forest, when both early and late-successional species coexist. In mature forest, competitive dominance by a few tree species can reduce diversity — supporting Connell's intermediate disturbance hypothesis.
Environmental Controls
The rate and trajectory of succession depend strongly on moisture, seed availability, and disturbance severity. Wet sites recover faster and support denser vegetation. Rich seed banks accelerate colonization. Severe disturbance that removes soil (primary succession) takes far longer than disturbance that leaves soil intact (secondary succession). Adjust these parameters to explore how environmental conditions shape ecosystem recovery.