Mushrooms and Climate Change: Nearly a Third of Studied Species Threatened

Climate change is altering not only the weather but also the habitats of mushrooms—with drastic consequences: A recent IUCN assessment reveals that nearly a third of studied mushroom species are threatened with extinction. The main causes are deforestation and the climate crisis. For our forests, which rely on mushrooms as partners, this is an alarm signal. In this article, we summarize the report from Earth.Org and explain why mushrooms and climate change are inextricably linked.

What the New Study Says About Mushrooms and Climate Change

The International Union for Conservation of Nature (IUCN) has, for the first time, compiled a comprehensive Red List for mushrooms. The result: Around 30 percent of assessed species are considered threatened. The main drivers are deforestation—such as from agricultural expansion—and the effects of climate change like droughts and wildfires. The report from Earth.Org (2023) summarizes the key figures: Of over 1,300 assessed mushroom species, nearly 400 are classified as "critically endangered," "endangered," or "vulnerable." Particularly affected are mycorrhizal fungi, which live in symbiosis with trees. These species are essential not only for the forest ecosystem but also for carbon storage in the soil.

Why Mushrooms and Climate Change Are Connected: Phenology and Distribution

Mushrooms are sensitive to changes in temperature and precipitation. Many species now fruit earlier or later than they did decades ago—a phenomenon known in mycology as "phenology." A warmer spring, for example, causes morel mushrooms to appear earlier, while autumn species like the Satan's bolete (Rubroboletus satanas) suffer from drought. These shifts are not only relevant for foragers but also alter forest interactions: When mushrooms and trees fall out of sync, mycorrhizal supply suffers. Additionally, distribution ranges are shifting: Warm-loving species are moving north, while cold-loving species are pushed to higher elevations—often with no escape route. Climate change thus acts doubly: directly through extreme weather and indirectly through the transformation of forests.

Forest Soils as a Key: Mycorrhizal Networks and Carbon Storage

Mushrooms are the hidden rulers of forest soils. Mycorrhizal fungi connect trees underground into a network that exchanges nutrients and water—while storing enormous amounts of carbon. It is estimated that fungi worldwide bind several gigatons of CO₂ equivalent per year. If these fungi disappear, not only is tree health compromised, but also the ability of forests to store carbon. Deforestation directly destroys these networks, but climate change also stresses them: Longer drought periods can kill mycorrhizal fungi before they can recover. A study from the USA showed that after droughts, fungal species diversity can decline by up to 50 percent. Conversely, heavy rainfall and flooding can disrupt oxygen supply in the soil—also weakening fungal communities.

What the Red List for Mushrooms Means—and What It Doesn't

The Red List is an important step, but it is not complete. So far, only a few thousand mushroom species have been assessed—out of an estimated 2.5 million worldwide. Many species are not even described yet, let alone assessed for their threat status. This means the actual threat could be even higher. At the same time, there is hope: Mushrooms are often resilient and can adapt quickly if habitats are preserved. The key is protecting intact forests—not only from a climate perspective but also for biodiversity. For mushroom enthusiasts, this means: When foraging, handle the habitat responsibly and don't uproot rare species; only take what you have confidently identified. A good overview of species and their distribution is provided by the FungiFind Species Lexicon—there you'll also find profiles for species like the Satan's bolete, which is on the warning list in Germany.

How FungiFind Helps: Using Climate Signals for Finding Opportunities

Precisely because climate change affects mushroom growth, current data is so valuable. The FungiFind Mushroom Map shows where and when mushrooms are currently reported—helping to identify patterns. Our weather score evaluates how favorable conditions are for mushroom growth, based on precipitation, temperature, and soil moisture. The season model predicts when certain species might appear in your region—making the change directly tangible. By regularly reporting finds, you also contribute to improving the data basis for research. Because the more we know about actual distribution, the better we can plan conservation measures. For more background and current articles, visit the FungiFind Blog.

Conclusion: Mushrooms and Climate Change—a Wake-Up Call for the Forest

The new Red List shows: Mushrooms are massively affected by climate change—and so are the forests that depend on them. Protecting mushrooms is thus not only a matter of biodiversity but also of climate protection. Everyone can contribute: Use forests respectfully, report finds, and stay informed. And if you want to forage mushrooms, always ensure expert identification—this article is purely informational and does not replace on-site mushroom consultation.

Sources

• [Nearly 1 in 3 Studied Fungi Threatened With Extinction From Deforestation, Climate Change - Earth.Org](https://news.google.com/rss/articles/CBMiqwFBVV95cUxNQUtBUWtpckZsajNtdDFpOEVHSkIzMGhxcWxYaHdfTUtjSkJvZFpzS1pENVozRmswakpqWVJLYXNRcmR4QTJULU5FUmFtNXREWi1mQVhBMmo1SEY0WXFmNnFBS21tbGtUeFdOMjNJWllsQ0JfaVE2dkxNdVZEbm45NFdjU0dJc1hXaXYtR3M3NXRScUtkUlhrSVZlQjFpOEJvNjh2aVZUU3Zkcjg?oc=5