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The major components of annual seed deposition in the rain forest at Los Tuxtlas, Veracruz, México are seeds of the pioneer tree species  Cecropia obtusifolia  and those of some species of  Ficus .  Cecropia obtusifolia  Bertol. forms a relatively persistent viable soil seed bank, whereas seeds of  Ficus  are seldom found in the soil. Both genera require light for seed germination; however, the species differ in their germination responses to far red (FR) light under laboratory and field conditions. Seeds of  C. obtusifolia  did not germinate in low red/far red (R/FR) or pure FR, whereas seeds of the  Ficus  species did. This suggests that  Ficus  seeds do not become dormant under the light conditions (low R/FR ratio) beneath the leaf canopy of the rain forest. This difference may explain why the species differ in their presence in the soil seed bank.

Comparison of light-regulated seed germination in Ficus spp. and Cecropia obtusifolia : ecological implications