Forest canopies create the conditions for an extraordinary diversity of life to thrive. By casting shade and retaining moisture in the air and soil, they generate cool and stable understory environments. In the tropics, this regulating effect is particularly crucial for countless species that otherwise would be unable to survive in the extreme heat of surrounding open landscapes. However, forest scientists are increasingly concerned that the combined pressures of global warming and habitat degradation could undermine forests’ critical thermal buffering capacity. New research from Southeast Asia predicts forests across the region will experience unprecedented peak temperatures over the next three decades. Heat levels beneath the canopy could hit new highs even within currently intact ecosystems by 2050, the study found, potentially exposing forest-dwelling animals, plants and fungi to severe levels of heat stress. “Our findings show that climate change is not only warming the atmosphere globally, but also reshaping the local conditions that species experience inside forests,” said Erone Ghizoni Santos, who led the study while he was a Ph.D. student at the University of Helsinki in Finland. Clouded leopards are one of many forest-dependent mammals that could be impacted by shifting understory microclimates. Image by Rhett A. Butler/Mongabay. Region-wide warming Prior research in Malaysian Borneo has demonstrated that when forests are degraded, such as through logging, they become more affected by climate shifts in the surrounding landscape. Depleted canopies allow more sunlight to reach the ground and trap less moisture, allowing heat to permeate the ecosystem. What was missing,…This article was originally published on Mongabay

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