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15 Aug 2013: Plants in U.S. Southwest
Moving Higher as the Climate Warms

Numerous plant species on a mountain in the southwestern U.S. are migrating to higher elevationsas the climate gets warmer and drier, according to a new study. After comparing the results of a recent
Alligator Juniper on Mount Lemmon University of Arizona
University of Arizona
An alligator juniper on Mount Lemmon
survey of 27 plants found on Mount Lemmon, a 9,157-foot peak near Tucson, Ariz., with a similar survey conducted in 1963, researchers at the University of Arizona found that three-quarters of the plants have shifted their range “significantly” upslope in the last five decades. In some cases, researchers found that the plants had moved upward by as much as 1,000 feet, into a much narrower elevation range than where the plants existed in the early 1960s. Writing in the journal Ecology and Evolution, the researchers note that the lowermost boundary for 15 of the species has shifted upslope. “If climate continues to warm, as the climate models predict, the subalpine mixed conifer forests on the tops of the mountains — and the animals dependent upon them — could be pushed right off the top and disappear,” said Richard C. Brusca, a research scientist who led the study.


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