Long-term demography and spatial genetic structure reveal mechanisms of Sassafras albidum population persistence through clonality.
Michel JT, Evans JP, Fox SJ, Morris AB
Native Plants
That sassafras thicket at the edge of the woods you walk past — the one that smells like root beer when you snap a twig — may be a single ancient individual that has been quietly spreading underground for generations.
Sassafras trees have two tricks for surviving in forests where little sunlight reaches the ground: they can re-sprout from the same spot after a stem dies, and they can send roots outward to pop up new shoots in better-lit patches nearby. Scientists tracked a patch of these trees in Tennessee for over 20 years and found that most of what looks like a grove of separate trees is actually a handful of genetically identical individuals spreading like a lawn. This underground persistence lets sassafras hang on through tough times even when individual stems keep dying and regrowing.
Key Findings
Within a single 1-hectare plot, researchers identified only 31 distinct genetic individuals (genets), yet some clones exceeded 100 stems and spread across more than 8,000 m².
Medium-sized stems were spatially and temporally unstable, forming a demographic bottleneck — while short and tall stems persisted, mid-sized plants were the most vulnerable stage.
Clonal growth via root suckering decouples stem death from genetic-individual death, allowing genets to persist across heterogeneous, low-resource forest environments for decades.
chevron_right Technical Summary
Sassafras trees survive for decades in shady eastern forests by cloning themselves underground, sending up new shoots from roots rather than relying on seeds. A 20-year study found that most of the stems in a Tennessee forest patch belonged to just 31 genetic individuals, some of which had spread across areas larger than a typical city lot.
Abstract Preview
Vegetative regeneration is a key mechanism of woody plant persistence in forest ecosystems, and the coupled roles of basal sprouting and clonal growth in shaping long-term population dynamics have ...
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Sassafras is a genus of three extant and one extinct species of deciduous trees in the family Lauraceae, native to eastern North America and eastern Asia. The genus is distinguished by its aromatic properties, which have made the tree useful to humans.