From sunlit shallows to sheltered lagoons, the seagrass meadows of the Dutch Caribbean are essential for biodiversity, coastal protection, and the wellbeing of our islands. But today, their condition is under threat. Mounting pressures from coastal development, human trampling, pollution, and climate change are degrading these critical underwater habitats. The 2024 State of Nature Report paints a sobering picture: urgent, coordinated action is needed to safeguard these submerged ecosystems before the damage becomes irreversible.

Red mangroves and seagrass beds in Lac. Photo credit: Henkjan Kievit

The Big Picture

Green turtle feeding on sea grass. Photo credit: Kai Wulf

Seagrass beds are found in the sheltered coastal zones of Bonaire, Saba, and St. Eustatius, particularly around Lac Bay, St. Eustatius’ Oranje Bay, and the shallows surrounding Saba’s coastal shelf. These underwater meadows are biodiversity hotspots, providing food and shelter for sea turtles, fish, and invertebrates, while also serving as crucial nursery grounds for many commercially important species. They are nature’s coastal engineers, trapping sediment, reducing wave energy, and helping maintain beach stability. Yet they are highly vulnerable. Physical damage from boat anchors and propellers and human trampling, excess nutrient input from untreated wastewater, sedimentation from land-based runoff, and the spread of invasive seagrass species such as Halophila stipulacea are undermining their health and resilience.

Ecosystem Services Under Pressure

The 2024 State of Nature Report, written by Wageningen Marine Research and subsidized by the Ministry of Agriculture, Fisheries, Food Security and Nature (LVVN), underscores the immense ecological and economic value of seagrass ecosystems. Healthy meadows act as powerful carbon sinks, capturing and storing “blue carbon” in both plant biomass and the sediment beneath them, playing a vital role in mitigating climate change. They also form the backbone of key nursery habitats, supporting juvenile fish and other marine species that later populate coral reefs and deeper waters, bolstering both biodiversity and fisheries. Importantly, by stabilizing the seabed and buffering wave energy, seagrass helps protect shorelines from erosion, safeguarding beaches that are central to tourism. But these same beaches and shallow bays are often sites of intensive recreational use, swimming, boating, windsurfing/kiteboarding, leading to trampling, scarring from boat activity, and increased sediment disturbance. Without proper management, these pressures can quickly push seagrass meadows past a tipping point.

Although this report specifically focuses on Bonaire, Saba and St. Eustatius, this same situation is echoed on the other three Dutch Caribbean islands of Aruba, Curacao and St. Maarten as well.

Seagrass. Photo credit: Rich Carey

Turning the Tide

Protecting seagrass habitats will require a multi-pronged approach: stricter enforcement of no-anchoring zones, investment in sustainable mooring systems, improved wastewater treatment to reduce nutrient pollution, and targeted efforts to control invasive species. Public awareness campaigns and better zoning for recreational activities can help minimize physical damage from tourism. Equally important is restoration through limiting human access to important seagrass areas, improving water quality to enhance recovery, and safeguarding adjacent habitats like mangroves and coral reefs that are ecologically linked to seagrass health.

The upcoming Conservation and Restoration of Key Habitats Program, led by DCNA and funded through the Dutch Postcode Lottery, WWF-NL, and Bloomberg Philanthropies, will prioritize these recommendations. By restoring seagrass habitats, enhancing enforcement, controlling invasive species, and piloting large-scale reforestation projects, the program aims to give nature a fighting chance. With continued collaboration across all six islands, and by grounding efforts in local knowledge and science, we can rebuild resilience and secure a greener future for generations to come.

This article is part of a new BioNews series highlighting key habitats in the Dutch Caribbean, based on the 2024 State of Nature Report by Wageningen University & Research. Read the full report here and subscribe to BioNews to follow the series.