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Why Dense Islands Of Fir Trees Form In Wyoming’s Bighorn Mountains
Cowboy State Daily • • science
Key Points:
- Wendy Johnson discovered unusual clusters of subalpine fir trees, called "atolls," growing as isolated groups in the Granite Pass area of the Bighorn Mountains, standing out amid grassy meadows.
- These fir atolls form through a process called layering, where mature trees help seedlings establish by dropping seeds and promoting root growth, allowing the clusters to slowly expand over time in optimal soil patches.
- The trees within these atolls are interconnected by fungal mycelium networks, enabling nutrient sharing and communication, which helps them collectively defend against herbivores and thrive in harsh, windy environments.
- Subalpine firs' adaptability and the protective microclimates created by the dense clusters allow them to survive where few other conifers can, but climate change remains a significant long-term threat to their habitat.
- Experts hope these resilient fir atolls continue to grow and expand, serving as vital components of high-altitude ecosystems in the face of changing environmental conditions.
