Besides increasing sea levels climate change will result in more damaging cyclones. Higher temperatures in the air and sea increases evaporation. This increased evaporation strengthens cyclones as well as dropping more rain and increasing the height of floods. Mangroves can be damaged by increased cyclonic winds and river mangroves damaged by higher floods with faster moving water.
Increased temperature of the sea will start changing the mix of species found in mangroves. Some of the more tropical species will be able to move south. The mix of animal species in the sea is already changing with many warmer species of fish and other marine animals moving south.