Most of Europe's original natural forests have been transformed for agriculture and managed forests producing energy, paper, ...
Rivers in northern Sweden do not always become wider or richer in species further downstream. Natural barriers shape the flow and stop plants from spreading, new research from Umeå University shows.
Previous theories have assumed that water, sediment and plant seeds move freely downstream (top image). However, lakes and rapids can become natural barriers where water can be slowed down as well.
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