1,500 Christmas trees sunk in lake transform ecosystem
Scientists in Finland submerged 1,500 Christmas trees in Lake Saimaa to study their impact on aquatic ecosystems. The experiment revealed a significant increase in the diversity and population of benthic organisms, suggesting that the trees provide vital shelter and food.
Why it matters
This research demonstrates how repurposed organic materials can be used to restore or enhance biodiversity in freshwater environments.
What happens when thousands of Christmas trees are thrown into a lake? In southeastern Finland, scientists set out to find the answer by deliberately submerging 1,500 spruce trees in Lake Saimaa as part of an unusual experiment designed to study their impact on aquatic life.The project began in 2021, when researchers from the Finnish Environment Institute (SYKE) placed groups of spruce trees on the bottom of the lake. The aim was to determine whether the trees could create an underwater habitat for organisms and fish, effectively turning parts of the lakebed into a kind of submerged forest.Three years later, researchers retrieved the trees and examined the areas where they had been placed.
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