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Home»Science»How a Fungus Transformed a Forest over Decades
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How a Fungus Transformed a Forest over Decades

October 8, 2024No Comments3 Mins Read
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Discover the dramatic changes that have occurred in the Shenandoah National Park’s forests over the past half-century due to a canker fungus. Cryphonectria parasitica, a canker fungus, has taken a toll on the dominant chestnut and oak trees, leading to a shift in the forest’s composition. This captivating story highlights the long-term impact of fungal outbreaks on ecosystems and the importance of continued research to understand these complex changes.

Documenting the impact of a fungal outbreak on a forest over half a century
Two images from the field show a chestnut sprout and a close up of the fungus. The canker fungus, Cryphonectria parasitica, is responsible for widespread loss of American chestnut trees from the forest canopy and resprouting branches of an infected tree, which are girdled and killed by the fungus before they can reach the canopy or reproduce. Credit: Claire Karban, CC-BY 4.0 (creativecommons.org/licenses/by/4.0/)

Following the Loss of an Ancient Forest

Scientists in the, popularity bulky plain on the pecan and oak trees of White Oak Canyon backwoods int eh Shenandoah National Park. The case was bolstered by botanist and ecologist Lucy Braun in her 1950 book Deciduous Forests of Eastern North America.

More than 30 years later, in 1977, Richard Karban returned to the same forest and discovered it pretty much as Braun had described. When Karban came back in 2021 to show the forest to his daughter Claire, “lo and behold,” he says, the forest had completed changed. The culprit? Cryphonectria parasitica (canker fungus)

Disease and Demise from the Fungus

Using this approach, the Karbans found that canker fungus alone had eliminated nearly all of the forest’s chestnut trees. Their research was published last May in a freely-accessible article in PLOS ONE. A dominant tree species disappearing abruptly has implications for ecosystem functioning.

Gaps are being filled with a smaller species, like the birch, instead of towering oaks to shade over small saplings used as food for deer and cattle. Curiously, not all the old chestnut trees have disappeared – some of them are growing back like bushes. The team intends to keep researching in the forest to unravel why its ecosystem has been such a slowpoke by these standards.

Cascading Effects Theory

In addition, as the Karbans’ research indicates, there is a deeper significance of the fungal infection. There has been an increase in the deer herd, apparently due to more brush which the qualified to be a bigger food supply. They also wonder whether the lack of big fires in recent centuries is due to a changeover among canopy trees.

The researchers expect that their work will provide insight into the intricate and lasting consequences of fungal disease in forests as they continue on their research. Only by knowing these dynamics can we develop strategies to reduce the impacts of outbreaks and better protect natural areas.

Cryphonectria parasitica ecosystem resilience forest ecology fungal outbreaks Shenandoah National Park
jeffbinu
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Tech enthusiast by profession, passionate blogger by choice. When I'm not immersed in the world of technology, you'll find me crafting and sharing content on this blog. Here, I explore my diverse interests and insights, turning my free time into an opportunity to connect with like-minded readers.

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