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Christmas Trees Transform Lake into Underwater Forest
26 Sep
Summary
- Submerged spruce trees created new habitats for aquatic organisms.
- Benthic animal numbers increased tenfold around submerged trees.
- Species diversity rose fivefold, boosting the aquatic food web.
In southeastern Finland, an innovative experiment submerged 1,500 spruce trees in Lake Saimaa, transforming parts of the lakebed into an underwater forest. Initiated in 2021 by researchers from the Finnish Environment Institute (SYKE), the project aimed to determine if these trees could foster aquatic habitats.
Three years later, the retrieved trees revealed a significant ecological impact. Benthic production, the life on or near the lake bottom, increased tenfold, with species diversity rising fivefold. These submerged structures provided shelter and food, supporting microbial and fungal communities which in turn fed smaller organisms.
The positive effects extended higher up the food chain, with local fishermen reporting a notable increase in fish populations in the areas where trees were placed. This experiment highlights a sustainable approach to managing Christmas tree waste, turning it into a valuable resource for aquatic biodiversity rather than a source of methane emissions from landfills.
