PubMed · 2026-05-28
Researchers studied 13 species of Vellozia — ancient plants native to Brazil's rocky mountaintop savannas — and found that while most can self-fertilize as a backup strategy, hummingbirds remain essential for robust fruit and seed production. Remarkably, wildfire directly triggered flowering in two species, revealing finely tuned reproductive timing tied to both seasonal rhythms and disturbance events.
Thirteen co-occurring Vellozia species split into two flowering strategies — massive synchronized blooms peaking in November and February, or low-intensity flowering stretched across the rainy-to-dry transition — with wildfire directly triggering bloom in two species (V. alata and V. caruncularis).
Twelve of 13 species were fully or partially self-compatible, yet pollinators still drove the majority of fruit and seed production in all but one (V. patens), which partially relied on autonomous selfing — showing self-compatibility is a safety net, not a replacement for pollinators.
Hummingbirds — specifically the White-vented Violetear and Glittering-bellied Emerald — were the dominant pollinators across the assemblage, confirming their outsized conservation importance for this diverse, threatened plant lineage.
