Plants, birds and butterflies: short-term responses of species communities to climate warming vary by taxon and with altitude.

PLoS One · 2014 · PMC3885385 · PMID 24416144

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showed a trendno p-value reported

In other words, plant and butterfly communities at the upper limit of the tree line showed a trend for an average downhill shift of 12 m and 40 m, respectively, within the eight years of the study.

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