Animals' Disappearance Threatens Tropical Forests' Ability to Store Carbon

Tropical forests play a vital role in mitigating climate change, with the ability to absorb significant amounts of carbon dioxide from the atmosphere. However, a new study has revealed that the disappearance of animals that disperse seeds in these forests can have a profound impact on their ability to store carbon. The research, which analyzed data from over 3,000 tropical forest sites, found that areas with fewer seed-dispersing animals store up to four times less carbon than those with healthy wildlife populations.

The study, published in the Proceedings of the National Academy of Sciences, highlights the critical importance of animals in maintaining healthy, carbon-rich tropical forests. The research team led by Evan Fricke from the Massachusetts Institute of Technology found that 81% of tropical trees rely on animals to disperse their seeds. This ancient partnership between animals and plants has been disrupted by human activities such as deforestation, road construction, and hunting.

The study's findings demonstrate that protecting wildlife and addressing climate change are interconnected challenges. By conserving animal species and preserving natural habitats, we can help restore seed dispersal and promote forest regrowth. In fact, the research suggests that natural forest regrowth can be more effective than planting trees, as animals play a crucial role in dispersing seeds and promoting biodiversity.

Key Takeaways:

The disappearance of animals that disperse seeds in tropical forests can lead to a significant reduction in carbon storage, with areas with fewer seed-dispersing animals storing up to four times less carbon than those with healthy wildlife populations.
81% of tropical trees rely on animals to disperse their seeds, highlighting the critical importance of animals in maintaining healthy, carbon-rich tropical forests.
Human activities such as deforestation, road construction, and hunting have disrupted the ancient partnership between animals and plants, threatening the ability of tropical forests to store carbon.
The study suggests that natural forest regrowth can be more effective than planting trees in promoting biodiversity and mitigating climate change.
Conservation efforts such as creating wildlife corridors and reintroducing seed-dispersing species can help restore seed dispersal and promote forest regrowth.
The research highlights the interconnected challenges of protecting wildlife and addressing climate change, emphasizing the importance of preserving natural habitats and conserving animal species.

Statistics:

3,000: The number of tropical forest sites analyzed in the study.
81%: The percentage of tropical trees that rely on animals to disperse their seeds.
4 times: The maximum amount of carbon stored in areas with healthy wildlife populations compared to those with fewer seed-dispersing animals.
57%: The reduction in carbon storage potential explained by seed dispersal disruption across proposed forest restoration areas.
1.5 times: The amount of carbon absorbed by forests each year, making them one of the most important natural tools against global warming.

Sources:

Fricke, E. C., Cook-Patton, S. C., Harvey, C. F., & Terrer, C. (2025). Seed dispersal disruption limits tropical forest regrowth. Proceedings of the National Academy of Sciences, 122(30), e2500951122. doi: 10.1073/pnas.2500951122
Harris, N. L., Gibbs, D. A., Baccini, A., Birdsey, R. A., De Bruin, S., Farina, M., ... Tyukavina, A. (2021). Global maps of twenty-first century forest carbon fluxes. Nature Climate Change, 11(3), 234-240. doi: 10.1038/s41558-020-00976-6