Abstract: Food web structure in Dalian coast was constructed using stable isotopes to evaluate the trophic relationships among biological taxa. The trophic levels of organisms in Dalian coastal area, as a whole, ranged from 1.85 to 4.06, that is, 2.46-2.75 for polychaetes, 2.23-3.37 for echinodermata, 2.82-3.36 for cephalopoda, 2.00-3.27 for gasteropod, 1.85-2.44 for bivalve, 2.50-3.30 for crustacea, and 2.64-4.06 for fish, respectively. The characteristic of trophic level showed that the primary consumers were mainly mollusks such as bivalve, the secondary consumers were composed of invertebrate, and the top predators were cephalopoda, omnivorous and carnivorous fishes, respectively.

Key words: scenario simulation., the Sanjiang Plain, landscape pattern, CLUE-S Model