|
PUBLICATION SPOTLIGHT
The accelerating loss and shifting dynamics of US tidal wetlands
| Yang et al., 2026
Coastal wetlands protect against flooding and erosion, provide critical habitat, and support commercial fisheries. However, these vulnerable ecosystems are in decline. Yang et al., 2026 reveals that despite decades of regulatory protection against direct human development, U.S. tidal wetlands have experienced a widespread and accelerating net loss of 1,640 km² from 1984 and 2024, primarily due to the decline of tidal marshes. Using nearly four decades of NASA-USGS Landsat data, researchers identified a critical shift in the drivers of this ecological degradation: while chronic stressors like sea level rise caused the bulk of the historical loss (around 60% of total area lost), acute shocks from extreme weather events—such as hurricanes and severe freezes—are now the dominant forces accelerating this decline. Direct human activity accounted for only 4% of total observed losses. Meanwhile, the total area of mangroves has remained seemingly stable only because climate-driven poleward expansion is offsetting massive weather-induced diebacks, masking the ecosystem's growing vulnerability. The researchers used a dense time series model to identify and characterize wetlands, relying on visible, shortwave-infrared, and thermal bands from Landsat. Looking to the future, the researchers state that these results signal that current conservation strategies are ill-equipped for a future dominated by extreme weather and call for proactive, large-scale, and adaptive restoration efforts to preserve these vital coastal habitats.
| 
