All changes saved () 17. (03.05 MC) How would a tsunami most likely affect the abundance of aquatic organisms in the intertidal zone of the ocean? (3 points) A tsunami would cause a downwelling, which would increase abundance because it would bring warm water into the ecosystem. A tsunami would cause an upwelling, which would increase abundance because it would bring warm water into the ecosystem. A tsunami would decrease abundance by causing physical damage to the organisms and their ecosystem. A tsunami would decrease abundance by concentrating the salinity of the water near where it made landfall