Bumblebees moving up: shifts in elevation ranges in the Pyrenees over 115 years.

By contrast, in northern Sweden two surveys 60 years apart did not show a clear trend of insect species moving to higher elevations [ 17 ].

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The relationship between bumblebee elevation shifts and the plants they visit in both periods showed a positive trend.

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We also calculated the annual mean temperature and the mean temperature of August for all years between 1900 and 2006 to test whether there was a significant trend in changing temperature.

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