Open-coast mangroves depend on quiet windows, not just suitable climate
WHAT THE EVIDENCE SAYS
Researchers analyzed 20 years of three-hourly wave data at 400 globally distributed open-coast sites and built a process-driven model around windows of sufficiently low wave forcing for seedling establishment. Among 394 sites with usable hydrodynamic data, the model predicted mangrove presence or absence with 78.2% accuracy. Mangrove and non-mangrove sites differed in the low-wave windows they experienced, and sensitivity tests showed that moderate changes in wave height or direction could shift establishment suitability.
WHY IT MATTERS / OUR READ
Mangrove restoration is often mapped from elevation, inundation or broad climate variables. This study adds a process that can decide whether propagules ever get through the establishment bottleneck. A site can look climatically suitable yet repeatedly lose seedlings if wave disturbance never relaxes long enough.
CAVEATS / UNCERTAINTY
The model addresses exposed open coasts, not back-barrier or reef-protected mangroves. It uses offshore wave reanalysis and shoreline geometry rather than local near-bed measurements, does not include tidal currents explicitly, and genus-level responses may differ. Suitability is not the same as successful restoration.
SOURCE
Nature — primary study
View original evidence ↗
A global mechanistic model found that periods of low wave forcing strongly separated mangrove from non-mangrove open coasts, making establishment opportunity a moving part of restoration suitability.
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