Primary species win by persisting under closed canopy rather than growing fast in gaps

Evidence

For primary species, which generally regenerate in gaps from the seedling or sapling stage, the necessity of early presence would select for the ability to persist under a closed canopy while awaiting gap formation. This capacity allows primary species to capitalize on the resources of small as well as large gaps [to this extent, they are not small gap specialists (Barton, 1984)], but precludes exceptionally rapid growth in large gaps. This adaptive trade-off could account for their even distribu­ tion and the lack of correlation of growth rate with gap size in the BCI study. The advantages of the primary species’ strategy are juvenile presence in the com­ paratively noncompetitive understory (Garwood, 1983), the likely occurrence of growth opportunities in relatively numerous small gaps (Fig. 1), the ability to persist through successive gap closures, and the capacity to invest in herbivore defenses (Coley, 1983). — S. T. A. Pickett and P. S. White, eds., The Ecology of Natural Disturbance and…, 467

Categorization

• DEFINE: Sharpens how ‘primary species’ is functionally defined: persistence strategy, not just small-gap specialization.
• XREF: A clean two-strategy trade-off model (persist vs. colonize) — pairs with the reader’s patch-dynamics synthesis and broader ecology teaching. — connects to: Many shade-tolerant trees reach the canopy through repeated suppression-and-release gap episodes, not one gap — S. T. A. Pickett and P. S. White, eds., The Ecology of Natural Disturbance and…, 1342; Mature forests harbor long-lived soil seed banks of pioneer species awaiting disturbance — S. T. A. Pickett and P. S. White, eds., The Ecology of Natural Disturbance and…, 440

Broader Connections

• Many shade-tolerant trees reach the canopy through repeated suppression-and-release gap episodes, not one gap #qualifies (0.85) — S. T. A. Pickett and P. S. White, eds., The Ecology of Natural Disturbance and…, 1342