# Puerto Rico cabe en seis mundos ecologicos

Date prepared: 2026-09-29
Published: 2026-10-01
YouTube Short: https://www.youtube.com/shorts/-3XJTjpoR14

## Receipt Spine

- USDA Forest Service / IITF describes the Holdridge Life Zone system as an ecological classification method based on temperature, precipitation, and humidity.
- The USDA data/tool page says the layer identifies 6 classes for Puerto Rico and the U.S. Virgin Islands.
- Ewel & Whitmore 1973 is the source publication for the Puerto Rico and U.S. Virgin Islands ecological life-zone framework.
- Gould et al. 2008 maps Puerto Rico landscape units by integrating climatic zones, substrate, topography, lakes, and rivers.

## Sources

- USDA Forest Service / IITF, Holdridge Life Zones Puerto Rico & USVI: https://research.fs.usda.gov/iitf/products/dataandtools/holdridge-life-zones-puerto-rico-usvi
- Ewel, J.J.; Whitmore, J.L. 1973. The Ecological Life Zones of Puerto Rico and the U.S. Virgin Islands: https://research.fs.usda.gov/download/treesearch/5551.pdf
- Gould, William A.; Jimenez, Michael E.; Potts, Gary; Quinones, Maya; Martinuzzi, Sebastian. 2008. Landscape units of Puerto Rico: https://research.fs.usda.gov/treesearch/38528
- Local production source lock: /Users/rjai/deliverables/puerto-rico-history-channel/puerto-rico-six-life-zones-source-lock-2026-09-29.md
- Final caption/source packet: /Users/rjai/deliverables/puerto-rico-history-channel/posting/puerto-rico-six-life-zones-final-caption-source-packet-2026-09-29.md
- Schedule receipt with YouTube ID: /Users/rjai/deliverables/puerto-rico-history-channel/posting/puerto-rico-six-life-zones-platform-schedule-receipt-2026-09-29.md

## Claim Guardrails

Say six Holdridge classes, life zones, or ecological zones. Do not say "six of seven land types" unless a separate source supports that exact framework.