Practice question

Early-successional species are typically selected for rapid occupation of recently disturbed, well-lit habitats. They often produce many small, widely dispersed seeds, germinate quickly, grow rapidly, mature early, and complete relatively short life cycles. Shade intolerance is common because their high photosynthetic capacity performs best in open conditions, while dense later canopies suppress them. Slow growth therefore conflicts with the standard pioneer syndrome and is more characteristic of many late-successional species that conserve resources, tolerate shade, and invest in long-lived tissues. High dispersal lets pioneers reach unpredictable patches, and a short generation time allows quick reproduction before competition intensifies. These are tendencies, not universal rules: some pioneers are long-lived trees, and trait combinations vary with disturbance type and environment. Fast growth may also trade off against tissue durability, defence, and survival under resource scarcity. The keyed contrast follows this life-history logic. A newly opened site rewards speed and dispersal, whereas slow growth becomes advantageous only when efficient resource use and persistence matter more than immediate colonization.