|Born||Leslie Rensselaer Holdridge
September 29, 1907
|Died||June 19, 1999
|Institutions||Instituto Tecnologico de Costa Rica|
|Alma mater||H. B.S. in Forestry, University of Maine, 1931, postgrad., 1931-32
M.S. in Ecology, University of Michigan, 1946, Ph.D., 1947.
Professor Leslie Ransselaer Holdridge (1907–1999) was an American botanist and climatologist. He was the son of Samuel Eneas Holdridge and Phebe J. Holmes. And he is the father of composer Lee Holdridge.
In his famous 1947 paper, he defined "life zones" using three indicators:
- Mean annual biotemperature (average temperature, after data values below 0 °C or above 30 °C have been eliminated)
- Total annual precipitation
- The ratio of mean annual potential evapotranspiration to mean total annual precipitation.
- Holdridge, L.R. (1947). "Determination of world plant formations from simple climatic data". Science 105 (2727): 367–8. doi:10.1126/science.105.2727.367.
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