Abstract: Fish samples were collected from the headwater streams of the Chencun Reservoir in Huangshan Mountain in November 2010, with the feeding habits of nine dominant fish species examined. These fishes mainly fed on organic detritus, alga, and invertebrates, suggesting that they were omnivorous or invertivores. One-way ANOSIM indicated that the diet composition varied significantly with fish species, but existed part overlap (P<0.001). The diet diversity and food niche breadth also varied significantly with fish species (P<0.05). Generally, benthic fishes could feed on more diverse diet sources than non-benthic ones, suggesting the possible correlation between fish diet diversity and microhabitat preference. According to the index of diet overlap, there was an obvious diet overlap (D>0.3) among the nine dominant fishes, and especially for Zacco platypus, Acrossocheilus fasciatus, Pseudorasbora parva, Rhodeus bitterling, and Cobitis rarus, their diet overlap index was D>0.9. The above-mentioned diet characteristics of the fishes could have close relations with the exogenous food supply and unstable physical habitat of the headwater streams.

Key words: carbon storage, carbon density, carbon content of organs, allometric growth equation, stand age.