Drought and freshwater abstraction can reduce freshwater inflows to estuaries and lagoons, increasing salinity, reducing water quality  and depleting resident macrophyte communities . Changes in freshwater input and SLR, combined with land-use change, can alter inputs of land-based sediments, causing expansion  or contraction  of intertidal habitats. The same phenomena alter salinity gradients, which are the primary drivers of estuarine species distributions  . Extreme reduction of freshwater input can extend residence time of estuarine water, leading to persistent HABs  and converting estuaries to lagoons if the mouth clogs with sediment .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report