Specific habitats such as the bottom and bank of creek increased habitat heterogeneity of estuarine tidal flat,and played an important role in maintaining species diversity in estuarine ecosystem.

• 潮沟底和潮沟边滩等特殊生境的存在 ,提高了淤泥质河口潮滩的生境异质性 ,说明了潮沟系统在维持河口生态系统底栖动物物种多样性中的重要作用。