Abstract: The greatest threat to the survival of species worldwide is the loss of suitable habitat.By the modified Tilman's analytical model of competitive coexistence in multispecies community,we simulated the species responses to the habitat destruction at million-year,ten-thousand-year and hundred-year time scales.The results showed that habitat destruction at million-year and ten-thousand-year time scales would be led to the competitive abilities changed,and the stronger species would be extinct earlier than the poorer species.While at hundred-year time scale species would be driven to extinction in the order from the originally poorest to the originally strongest.At million-year time scale and ten thousand-year time scale,species would oscillate quasi-periodically and decline to extinction with time,and the amplitudes along with quasi-periods of species evolution would polarize more obviously increased with q(the proportion of occupied habitat of the best species).At hundred-year time scale,the species evolutionary curves would not oscillate.At larger scale,the extinction time would increase with q,while the extinction time of species would become much shorter with q increased in the case of a smaller scale.

Key words: Fugu rubripes, Microecology, Fermentation products, Tetrodotoxin