Tropical Heat Surges, Rainfall Shifts Dramatically

Tropical rainforests, known for their stable temperatures, are now showing clear signs of climate change through increased extreme weather events. Researchers analyzing data from the La Selva Research Station in Costa Rica and the El Verde Field Station in Puerto Rico have found a significant rise in the frequency of extreme heat days. While average temperatures have risen only slightly, the hottest days have become notably more common, impacting plant and animal life adapted to consistent conditions.

Rainfall patterns have also diverled at these two sites. La Selva has seen an increase in heavy downpours and fewer dry days, whereas El Verde experienced a rise in days with very little rain. These shifts in precipitation, despite similar annual totals, can disrupt forest ecosystems. Furthermore, small forest streams at both locations have shown measurable warming trends, with the El Verde stream experiencing a more pronounced increase.

The findings challenge the perception of tropical forests as unchanging environments. Scientists emphasize that even small shifts in temperature and rainfall extremes can significantly affect ecosystem functioning. These observed changes, occurring over relatively short periods, demonstrate the ongoing impact of climate change and warrant further investigation into the responses of forest inhabitants.