Nature’s quiet engineers: the species teaching us to rebuild
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Despite export bans and international protection, millions of seahorses are trafficked through a vast and largely hidden global network. By They chew through trees, flood landscapes, and leave behind what many see as chaos. To some landowners, beavers are pests – felling trees and blocking waterways. But what looks like destruction is, in ecological terms, construction. These industrious animals are nature’s engineers, reshaping landscapes in ways that restore balance and biodiversity.
A new long-term study from southern Finland reveals how powerful their influence can be. Conducted in the Evo region over more than 50 years, the research tracked how beavers transform landscapes, and the effects on ecological communities over time. The findings stressed the case for long-term research and viewing beavers as allies in ecosystem restoration.
Petri Nummi, a senior lecturer from the Department of Forest Sciences, University of Helsinki, has been involved with the project for 43 years. He began his work in 1982 with a master’s thesis. “There were not too many beaver families back then,” he recalls. The animals had been reintroduced to Finland in the 1930s from Norway and other parts of Europe, after earlier attempts with the American beaver proved unsuitable.
When beavers move into an area, Nummi explains, they transform it in stages. Their dams create ponds that teem with aquatic life. As food sources decline or dams collapse, the beavers move on. Young vegetation and trees then reclaim the area until beavers eventually return. This natural cycle of flooding, abandonment, and renewal creates a constantly changing landscape that supports remarkable diversity.
The research team mapped beaver dams, flooded zones, and abandoned sites across the boreal forest landscape to see how these changes affected habitat suitability and connectivity. The results were striking. Areas shaped by beavers became almost ten times more suitable for various species, including moose, voles, and diving beetles. “Even after beavers leave, their engineering legacy remains,” Nummi says.
By creating a patchwork of wet and dry habitats, beavers boost biodiversity and landscape resilience. The Evo region, a long-standing forest research area now envisioned as a national science park, provides an ideal setting for continued research into these ecosystem engineers, whose quiet labour may hold lessons for landscape restoration elsewhere.
We originally published this article in the fourth edition of ThisWildEarth. Find more of our publications here.
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