| Madrean Pine-oak Woodlands |
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Information AboutMadrean Pine-oak Woodlands |
| CATEGORIES ABOUT MADREAN PINE-OAK WOODLANDS | |
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The Madrean pine-oak woodlands are found at higher elevations in Mexico's major mountain ranges, the Sierra Madre Occidental , the Sierra Madre Oriental , the Trans-Mexican Volcanic Belt , the Sierra Madre Del Sur , the Sierra Madre De Oaxaca , and the Peninsular Ranges of the Baja California Peninsula . Enclaves of pine-oak woodland are also found on mountaintops in southern Arizona and New Mexico and in western Texas , where they are known as the Madrean Sky Islands . Conservation International estimates the woodlands' original area at 461,265 km&2. The woodlands are surrounded at lower elevations by other Ecoregion s, mostly tropical and subtropical Deserts And Xeric Shrublands , Forest s, and Grassland s. The pine-oak woodlands are made up of stands of Oak ''(Quercus)'', Pine ''(Pinus)'', Douglas-fir ''(Pseudotsuga)'' and Fir ''(Abies)''. The trees generally occur in mixed stands, though monospecific stands are sometimes found. The pine-oak woodlands are home to one-quarter of Mexico's plant species, and Mexico is home to 44 of the 110 species of pine and over 135 species of oak, over 30 percent of the world’s oak species. Plant species derived from Madrean ancestors, known as the Madro-Tertiary Flora , are an important element of the California Chaparral And Woodlands ecoregion. The World Wildlife Fund recognizes several distinct pine-oak woodlands ecoregions, based on geographic distribution and species mix.
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