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Seven of the most common forest trees in Europe have been shown to be able to shelter their genetic diversity from major shifts in environmental conditions. This is despite their ranges having shrunk and the number of trees having fallen sharply during ice age cycles. These are the findings of a study by a European consortium including Uppsala University, published in Nature Communications.

"From a biodiversity perspective, this is very positive because these trees are keystone species on which many other species depend," says Pascal Milesi, Associate Professor of Plant Ecology and Evolution at Uppsala University and first author of the study.

The researchers aimed to investigate how the genetic diversity of tree species was affected by the ice age cycles. Trees have lived through warm and cold periods. During the last ice age, about 10,000 years ago, the range of trees was greatly reduced. Scientists therefore thought that genetic diversity would be low. However, it turned out to be just the opposite—the species had high genetic diversity and were thus resilient to the drastic changes in their habitat.

"We believe the reason for this high genetic diversity is related to the way these tree species survived through the ice ages and to the fact that tree pollen can travel thousands of kilometers, bringing together trees that grow far apart. This is a welcome sign. The evolutionary processes that were at play in the past may also be useful to cope with today's rapid climate change," Milesi says.

Together with scientists from 22 European research institutes, he studied seven species of forest trees common in Europe, collecting needles and leaves from around 3,500 trees in 164 different populations across Europe. Their DNA was then extracted and analyzed.

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