an ecosystem (system of an ecological community and its environment)

red tide

big, large, great

influence, effect

to influence, to have an effect upon

ecology, mode of life of living creatures / way of life, the way people live

occur, rise / develop

occurrence, incidence / (biology) development

a sea, an ocean / a lake / (figuratively) an object covering over a large area, as in 血の海 (chi no umi, “pool of blood”) or 火の海 (hi no umi, “sea of fire”)

to give something; to bestow; to grant; to impart