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Salinity and submergence have shaped coastal wetlands into one of the mostproductive and yet fragile ecotones worldwide. Sea-level rise alters bothsalinity and submersion regimes, threatening the future existence of thesehabitats. Still, the magnitude of the impacts is elusive. A current paradigm isthat coastal communities will keep pace with sea-level rise through soilaccretion, a process largely sustained by the interaction of plants andgeomorphology. This thesis, however, rests on the assumption that submersion isthe main driver of bio-geomorphic processes and does not include the effects ofsalinity on plant hydrologic function. Here, we show that salinity has a majorinfluence on how tidal vegetation controls the depth of the water table - a keyecohydrological process regulating plant establishment, survival rate, andproductivity. Our findings rely on long-term observations from the FloridaEverglades and modeling results. They indicate that altered salinity regimescan suppress transpiration, undermining in this way the ability of tidalecosystems to control water table movements and contrast other forms of plantstress like waterlogging. This effect is apparent in the mangroves of theEverglades' tidal fringe, where salinization has already yielded extensivedecoupling between plant hydraulics and groundwater dynamics. This mechanismleads to shallow water tables and poor soil-aeration conditions, with sizableimpacts on coastal wetlands' hydrologic function and elasticity.

Declining hydrologic function of coastal wetlands in response to saltwater intrusion