Climate change affects ecosystems worldwide, often with negative consequences.
In northern Sweden, however, we see an interesting exception – the oak, which seems to have been given better conditions thanks to the warmer climate.
– Now it comes again. Now the oak has been given a new chance and I, as a Scanian who has moved in, am extra happy when I see these noble deciduous trees, says Per Hansson who is associate professor in forest management.
Although climate change at the global level is mainly harmful, the rising temperature has created new opportunities for the oak to spread northwards.
This year is also reported to be a peak year for acorn production. This provides an important food source for many bird species, including jays and ring doves. But it is a specific bird, the barn owl, that plays a decisive role in the spread of the oak.
Forgetfulness is good for the oak
The nightingale has a unique habit of gathering acorns before winter and hiding them in the ground. Many of these hiding places are forgotten, which means that the acorns can germinate and form new oaks. In this way, the nightingale contributes indirectly to the oak’s expansion in areas where it previously had difficulty establishing itself.
– Unlike the jackdaw that bites the acorn, the barn owl flies away with the acorn to meet its need for food during the winter, says Per Hansson.
Biological diversity
The oak is not only a stately tree, it also plays a decisive role in the biological diversity of our forests. By providing habitats and food for a range of different species, from insects to birds and mammals, it helps to keep our ecosystems in balance.
– The oak is known for its rough bark and over 1,000 different species can live in it and on it, which contributes to biological diversity. The oak is therefore worth preserving and protecting, says Per Hansson.