Study Finds Tropical Insects Near Heat Limits
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- Study examined over 2,000 insect species across elevational gradients in Kenya and Peru, measuring each individual's critical thermal maximum.
- Researchers found that lowland insects in tropical Africa and the Amazon already live within a few degrees of their thermal limits, while high‑elevation species have larger safety margins.
- Flies were identified as the most heat‑vulnerable group, showing the lowest heat tolerance and the least capacity for short‑term physiological adaptation.
- Grasshoppers showed higher heat tolerance and more stable proteins, indicating that protein architecture may constrain thermal limits.
- Deep‑learning model predicted that insects with heat‑stable proteins tend to have higher thermal maxima, linking molecular stability to heat resilience.
- Climate projections to 2100 were compared with lowland insect heat limits, showing that projected temperatures approach or exceed many species' thermal maxima.
- Habitat complexity such as intact forests and savannas provides thermal refuges, but habitat loss and fragmentation reduce these options, making climate corridors essential for insect survival.
Why it matters: Agriculture, waste management and food webs depend on tropical insects for pollination, decomposition and as prey; the loss of lowland species—especially heat‑sensitive flies—would undermine these services, jeopardizing crop yields and disease control for human communities. It also threatens biodiversity and the stability of ecosystems that support tourism and cultural values.
