In a secluded area of Utah’s Fishlake National Forest, a solitary quaking aspen has been quietly reproducing itself since approximately the conclusion of the last Ice Age. Known as Pando \u2014 derived from the Latin “I spread” \u2014 it spans 106 acres, weighs around 6,000 tonnes, and sends up tens of thousands of genetically identical stems from a single continuous root system. By dry weight, it is recognized as the largest single organism on Earth. Yet, on any given summer evening, mule deer are consuming it to extinction.<\/p>\n
The trees visible above ground are, in a way, misleading. Each trunk resembles an individual aspen, with pale bark and coin-shaped leaves rustling in the breeze. Below the surface, they are all a single organism, connected by an underground network of roots that has been producing new shoots \u2014 referred to as ramets \u2014 for somewhere between 9,000 and 14,000 years.<\/p>\n
One seed, 14,000 years ago<\/p>\n
Pando originated from a lone seed the size of a pinhead. That seed sprouted into a male aspen \u2014 Pando is dioecious and entirely male \u2014 and instead of depending on pollen and young plants for dispersal, it began sending out lateral roots that produced new stems above ground. Every trunk you observe is genetically identical to the original seedling.<\/p>\n
Age estimates differ because you can’t core Pando like you would a typical tree. The mature stems currently present are only between 110 and 130 years old, according to ecologist Paul Rogers, who has dedicated years to studying this clone. The root system is the ancient component. Conservative estimates suggest it is at least 9,000 years old, while others claim it could be up to 14,000 years old, implying Pando was already thriving when the first humans in North America were creating cave paintings in what is now New Mexico.<\/p>\n
For context: the bristlecone pine named Methuselah in California, often referred to as the world’s oldest non-clonal tree, is estimated to be around 4,800 years old. Pando might be over three times that age.<\/p>\n
The statistics of a 6,000-tonne plant<\/p>\n
The physical dimensions are nearly unimaginable. 106 acres is equivalent to about 80 American football fields. 6,000 tonnes roughly matches the weight of 40 blue whales or a small naval destroyer. Tens of thousands of stems, each appearing as an individual tree, all extracting water and nutrients through a communal root network that scientists have verified through genetic analysis.<\/p>\n
What defines a clonal colony as a single organism biologically? The criteria hinge on genetic similarity and physical connectivity. Every stem in Pando possesses the same DNA. Each stem is, at least conceptually, linked to others below ground. If you sever a root, the stems it sustains may continue to grow for a while, but they have been part of the same organism for millennia. This is a more stringent criterion than most fungal networks meet, and Pando fulfills it.<\/p>\n
Some aspen clones exhibit particularly vigorous vegetative growth, which may clarify how one seedling succeeded in spreading across a hillside comparable to a small town.<\/p>\n
Why a single plant, not merely a forest<\/p>\n
Aspens do this wherever they thrive. Throughout the American West, most aspen groves you stroll through are clones \u2014 smaller, younger versions of what Pando is. The species has evolved to propagate laterally through roots since seedlings find it challenging in dry, competitive soils. Growing a new stem from an existing root system is quicker and less resource-intensive than starting from a seed.<\/p>\n
Additionally, aspens occupy a niche that nurtures vast biodiversity. Aspen species are located across the northern hemisphere, from British Columbia to Karelia to Kamchatka, and the groves they create support hundreds of dependent species \u2014 songbirds, insects, understory plants, fungi. When aspens falter, those communities disintegrate along with them.<\/p>\n
Pando represents the extreme efficiency of the aspen strategy. Given the correct hydrology, suitable soils, and a prolonged period of favorable climate, one seedling can evolve into a hillside. Then a forest. Eventually, over ten millennia, something for which our language falls short.<\/p>\n
The mule deer issue<\/p>\n
Pando is succumbing through attrition, and the process is disappointingly straightforward. Each spring, the root system generates thousands of young shoots. Each summer, mule deer and cattle consume nearly all of them before they reach a height beyond their reach.<\/p>\n
What remains is a demographically compromised forest. Mature stems are aging \u2014 nearing the end of their natural lifespan \u2014 and dying off. There is no upcoming generation poised to take their place. Rogers and his colleagues describe the grove as a declining elder generation overseeing an empty nursery. Photographs of Pando captured over the past several decades reveal a thinning canopy, with growing gaps where trunks have fallen and nothing has emerged to fill their absence.<\/p>\n
The deer are not the initial culprit. Humans are. Wolves and cougars, which once maintained<\/p>\n","protected":false},"excerpt":{"rendered":"
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