New research published in 2025 suggests that ordinary tropical thunderstorms—rather than heat or drought alone—are a primary, yet frequently overlooked, cause of widespread tree mortality in tropical forests. According to a perspective piece in Ecology Letters, scientists Evan Gora and his colleagues argue that while climate research has historically prioritized heat, fire, and drought, convective storms play a significantly larger role in forest dynamics than previously accounted for in climate models.
Tropical Storms Identified as Major Driver of Tree Mortality
These storms, which are characterized by rapid development, intense winds, and lightning, are not classified as hurricanes or cyclones. Despite their frequent, localized nature, the researchers suggest they are responsible for 30 to 60 percent of tree mortality in the regions studied. According to Spacedaily, the team posits that as storm activity intensifies due to climate change, this contribution to forest loss is likely to increase.
The Role of Lightning in Forest Structure
The impact of these storms extends beyond immediate physical damage. A separate 2025 study by Gora and his team, published in New Phytologist, utilized a dataset from Panama to examine the effects of lightning strikes. The findings revealed that lightning killed 56 percent of the trees directly struck.
However, the research also highlights that lightning serves as a complex force in shaping forest ecosystems. While a source of mortality, lightning strikes can also benefit certain resistant tree species by clearing away surrounding competitors and lianas. By reanalyzing large-scale, plot-based studies of tropical forest carbon dynamics, the researchers found that lightning frequency serves as a strong predictor of forest carbon storage and residence time.
Why Storm Damage Has Been Overlooked
The study authors note that storm-driven mortality is difficult to track compared to other environmental stressors. While heat and drought are consistently measured via satellites, climate datasets, and weather stations, storm damage is often “messier” and more sporadic. A single small storm cell can flatten a specific portion of a forest while leaving adjacent areas entirely unaffected. Furthermore, lightning can kill trees without the telltale sign of fire, making it easier for researchers to miss these events in broad forest assessments.
Complexity of Climate Variables
The 2025 Ecology Letters perspective emphasizes that tropical forest health is rarely the result of a single climate variable. The researchers argue that by accounting for storm activity, the apparent evidence for the sole impact of high-temperature effects in previous analyses is weakened.
The authors conclude that the answer to why forests are changing is less “tidy” than researchers once assumed. Forests can be simultaneously battered by storms, subjected to high heat, and plagued by drought. The team asserts that their findings are strong enough to warrant a shift in how scientists study tropical forest change, moving away from a narrow focus on drought and heat to include storms as a major, direct driver of ecological shift.
Summary of Research Findings
| Finding | Key Detail |
|---|---|
| Estimated Storm Mortality | 30–60% of tree deaths |
| Lightning Mortality Rate | 56% of directly struck trees |
| Primary Driver | Ordinary convective thunderstorms (not hurricanes) |
| Scientific Impact | Storm frequency strongly predicts carbon storage |
The findings from Gora’s team underscore the need for a more comprehensive approach to forest monitoring, as the surprising part
of the study is not that storms kill trees, but the sheer scale of the impact that has historically been omitted from forest carbon studies.
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