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An Unexpected Shift in Treeline Vegetation

[caption id="attachment_3405" align="alignright" width="300"] Photo 1: A map of the GTREE observation network. Image credit: Carissa Brown.Scientists usually aim to collect as much data as possible to help detect pervasive or repeated patterns often hidden by the high variability of individual observations. Drawing strong inference from individual, often anecdotal occurrences can be misleading because it is difficult to know whether the relationships we see can be generalized to other instances. On the other hand, as human beings we seem to learn well from stories of individual events, and these have the power to transform our understanding in ways that may have a bigger impact than reams of data. To me, this is one of the challenges of working as a field ecologist, where there is often a tension between developing strong inferential power by assembling datasets with many observations and developing a deeper understanding of the dynamics unfolding in any one...
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A story of hotspots and stepping stones

[caption id="attachment_2683" align="alignright" width="300"] A typical subarctic mountain trail, winding through a blueberry field (Vaccinium myrtillus).Predicting the faith of exotic plant species in cold-climate mountainsAbisko, a small village north of the polar circle in Swedish Lapland. The origin of several mountain trails, winding through the pristine subarctic vegetation towards the breathtaking views at the top. A vegetation mostly consisting of slow-growing mosses and dwarf shrubs that seem to have been there forever. Yet during the last few years or decades, changes in this vegetation increasingly start to become apparent: several new species that are traditionally not a part of the subarctic vegetation are popping up along the trails. Clovers, common yarrow, sweetgrass or annual meadow grass, species that are typical residents of the milder parts of Europe, are now getting a foothold even here, in the high north. They border the trails, grow in the roadsides, line the buildings at the...
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