In december 2004, a tsunami (giant wave) destroyed many of the marine organisms along the coast of the indian ocean. what can be expected to happen to the ecosystem that was most severely hit by the tsunami

The ecosystem will change until a new stable community is established.

After a devastating destruction of an ecosystem, the ecosystem will, by ecological succession, undergo a process of change in the ecological community restructuring its species. It may take years to decades, or centuries. The restructured community starts with only a few first, small in complexity plants and animals and develops from there to a greater complexity until a new stable community is established.