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Colombian Wetland Choked by Invasive Plant
12 May
Summary
- Invasive plant native to Asia rapidly spreads across Colombia's Cienaga Grande.
- Fishing communities face crisis as plant chokes waterways and hinders livelihoods.
- Pollution and altered water flows fuel the invasive plant's rapid proliferation.
Colombia's vast Cienaga Grande de Santa Marta wetland is experiencing an environmental crisis due to the rapid spread of Hydrilla verticillata, an invasive plant from Asia. First appearing around mid-2025, the dense vegetation now blankets large areas, severely impacting fishing communities such as Nueva Venecia and Buenavista. These communities, built on stilts, rely heavily on the wetland for their livelihoods.
The invasive plant hinders fishing by tangling nets and blocking access to traditional fishing grounds, leading to decreased catches. It also obstructs transport routes and limits access to potable water, forcing residents to collect water from contaminated areas. Pollution from untreated wastewater in the Magdalena River, the wetland's main water source, contributes nutrients that fuel the plant's rapid growth, a process known as eutrophication.
Community leaders express frustration over what they describe as a slow and insufficient government response. While local efforts involve manual clearing, effective large-scale solutions are lacking. The situation poses a risk of mass displacement for residents. Regional authorities are monitoring the situation, but national guidelines for controlling this species are still pending.
