What is mid-successional species?

Mid-successional species are organisms that colonize an area after pioneer species have established, but before the climax community is reached. These species are adapted to survive in conditions of moderate disturbance and competition, and often grow rapidly and produce many offspring. Examples of mid-successional species include shrubs, grasses, and trees such as birch, aspen, and cottonwood. These species help to establish and maintain structural complexity in an ecosystem, providing habitat for other organisms and helping to prevent soil erosion.