A new worldwide survey using satellite and aerial imagery shows that seagrass meadows have declined sharply and are deteriorating across most of their range, with the majority of remaining habitats lying outside protected areas, according to a study published in Nature on June 24, 2026.
The research compiled high‑resolution data from 2019 to 2024 to create the first comprehensive map of seagrass distribution worldwide. Findings indicate a substantial loss of seagrass cover and a marked increase in degradation indicators, such as reduced canopy height and fragmented patches. More than 80 % of the mapped meadows fall beyond the boundaries of existing marine protected areas, limiting the effectiveness of current conservation frameworks.
Seagrass ecosystems, which store carbon, support fisheries and protect coastlines, are considered critical for climate mitigation and biodiversity. The study’s authors warn that the rapid decline undermines these ecosystem services and calls for urgent integration of seagrass conservation into climate‑policy agendas.
“Without targeted protection and restoration, the trajectory we see will continue, compromising both marine life and the climate benefits that seagrasses provide,” the authors wrote.
The analysis highlights gaps in global marine protection strategies and suggests that expanding protected area networks to include key seagrass habitats could curb further losses. It also underscores the need for standardized monitoring to track the health of these underwater meadows more effectively.
Conservation groups and policymakers are expected to use the high‑resolution map as a baseline for prioritizing restoration projects and for aligning marine protection targets with the United Nations’ biodiversity and climate goals.
Analysis: The study’s comprehensive mapping offers a rare, data‑driven glimpse into the state of seagrass worldwide, revealing that current marine protected area designations are insufficient for safeguarding these vital habitats. By quantifying loss and degradation, the research provides a clear metric for assessing the success of future conservation initiatives and may influence international climate negotiations that increasingly recognize nature‑based solutions.
Sources
Nature, “Global high‑resolution mapping of seagrass to support conservation,” June 24, 2026, https://www.nature.com/articles/s41586-026-10704-3
Source: Nature – Original article
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Story synopsis gathered from: Nature — source
