Because the species living in the marsh near the river mouth have to cope with the adverse conditions of oxygen-poor, highly saline soils, those that are able to survive are highly adaptable, and although the number of species is not great, they reproduce prolifically.
由於生活在河口的物種必須克服土壤缺氧、高鹽等惡劣環境，因此能夠存活下來的，適應力都超強，種類雖然不多，卻會大量繁衍。