Blue-green algae crisis escalates in Archipelago Sea, warns nature photographer Jaakko Ruola

The blue-green algae situation in the Archipelago Sea has reached alarming levels, according to nature photographer Jaakko Ruola. “I have never experienced such an algae summer before,” he states. Ruola was involved in founding the “Operation Unique Archipelago Sea” campaign six years ago, working to raise awareness among decision-makers and the public about the fragile state of the Archipelago Sea. “As a child, I experienced clear waters and vibrant ecosystems. I would like to offer my grandchildren and future generations the same enjoyment that I have experienced,” he adds.

This summer, Emilia Pohto, an intern at the Southwest Finland Ely Centre, is monitoring blue-green algae in the region. She notes that numerous public sightings of algae have been reported recently, indicating a significant presence across various locations, from the inner archipelago to the outer islands. Current assessments are based on regular monitoring points and citizen reports, alongside satellite imagery.

The proliferation of algae blooms depends on local conditions. “Large surface mats are less likely to form in areas with high water flow. If water stands still, such as in a bay, algae blooms are more likely to develop,” Pohto explains. Specialist Vivi Fleming from the Finnish Environment Institute mentions that blue-green algae may have increased slightly in the western Gulf of Finland in recent days, but cloud cover has limited comprehensive satellite observations.

Fleming explains that in the last decade, previously sporadic algae blooms in the Sea of Bothnia have increasingly become a summer phenomenon. The nutrient status in this area, particularly the relationship between nitrogen and phosphorus, has changed, leading to higher phosphorus concentrations that exacerbate algae proliferation. This increase is primarily driven by agricultural phosphorus runoff. The government is working on a program to reduce nutrient loading in water bodies, including measures like gypsum distribution on fields and promoting water responsibility in businesses.