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globalbriefs Migrating Trees: Forests Shift West with Climate Change


The consequences of climate change are impact- ing plant species in unanticipated, but logical ways; for instance, conifers and other needle trees are moving northward because they are more sensitive to temperature than flowering, deciduous trees. They already populate the boreal forest of eastern North America, so they’re well-adapted to expand into colder, drier conditions. Individual trees can’t move, but popula- tions can shift over time as saplings expand


into a new region while older growth dies in another. A new study published in Science Advances also shows that about three-quar-


ters of tree species common to eastern American forests, including white oaks, sugar maples and


American holly, have shifted their population centers westward since 1980 due to drier conditions in the East. Global warming has significantly altered rainfall totals.


Songlin Fei, a professor of forestry at Purdue University, in West Lafayette, Indiana, and one of the study authors, observes, “Different species are responding to climate change differently. Most of the broadleaf species of deciduous trees are following moisture that’s moving westward.” Changes in land use, conservation efforts, wildfire fre-


quency and the arrival of pests and blights all play parts in shifting populations. Forest ecosystems are defined as much by the mix of species and the interaction between them as by the simple presence of many trees. If different species migrate in different directions, then ecological communities could eventually collapse.


American Roots: Columbus Day Renamed to Honor First Peoples


Many people feel that Christopher Columbus is partly responsible for the genocide of Native Americans, and bestowing him a day of celebration adds insult to injury. In a progressive move, the Anadarko City Council, in Oklahoma, unanimously voted to change Columbus Day to Indigenous Peoples’ Day—observed this year on October 9. City employees get the holiday off, and other municipalities in Oklahoma have followed suit.


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