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Atlantic Sargassum Blooms Explode: Land Nutrients Fueling Crisis
2 Jul
Summary
- Immense seaweed band now spans thousands of kilometers across the tropical Atlantic.
- Nutrient enrichment from land sources is significantly fueling unprecedented algae growth.
- Massive strandings threaten coastal tourism, marine habitats, and ecosystems.
The Atlantic Ocean is now host to an immense band of sargassum seaweed, stretching thousands of kilometers between West Africa and the Gulf of Mexico. Once a more localized phenomenon, this free-floating algae has expanded into an ocean-scale feature.
Satellite observations revealed unusually large concentrations starting in 2011, forming the Great Atlantic Sargassum Belt. Studies indicate this belt has reached record biomass, with millions of tonnes of seaweed documented. Researchers attribute this surge to a combination of ocean currents and increased nutrient availability.
Nutrient enrichment from sources like the Amazon River, agricultural runoff, and wastewater is significantly fueling sargassum growth. Studies show a substantial rise in seaweed's nitrogen content, indicating greater nutrient influence from land-based human activities. This shift suggests human impact extends further into ocean ecology than previously understood.
While sargassum serves as a vital habitat for marine life in the open ocean, its arrival at coastlines creates serious issues. Large strandings can blanket beaches, decompose to release harmful gases, and negatively affect seagrass beds and coral reefs. Tourism-dependent regions in the Caribbean and Gulf of Mexico face considerable costs clearing beaches during major influxes.
