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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
Sponsored by:Sichuan Society of Zoologists; Chengdu Giant Panda Breeding Research Foundation; Sichuan Association of Wildlife Conservation; Sichuan University
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Analysis on the feeding habits of Saurogobio dabryi in different reaches in Jialing River
Author of the article:LV Zhenyu
Author's Workplace:Southwest branch of the national freshwater fishery engineering technology research center , College of Life Science, China West Normal University, Nanchong Sichuan 637009, China
Key Words:Jialing River; Saurogobio dabryi; feeding habits; space
Abstract:Abstract:The samples of stomach content of Saurogobio dabryi were collected at different reaches in Jialing River from October 2015 to November 2016, and the food composition was investigated based on the analysis of stomach contents. Results showed that Saurogobio dabryi was an omnivorous fish, five broad diet categories (79 small diet categories) were identified. Cluster analysis showed that the occurrance rate(F%), numerical percentage(N%) and percent index of relative importance (IRI%)were consistent in measuring contribution of each food category to Saurogobio dabryi. There were significant differences between weight percentage (W%) and each of the above three indices in measuring the contribution. As animal bait dominated the diets in upper and midstream, Saurogobio dabryi was carnivorous omnivorous fish, and algae dominated the diets in downstream, Saurogobio dabryi was phytophagous omnivorous fish in terms of the above mentioned four indices. The comparison between different reaches was conducted with W%, and the clustering analysis showed that there were significant differences between the food composition of the middle reaches and the upstream and downstream(d>0.3).The schoener overlap index showed that food composition of the fish varied with different reaches(Cxy<0.6). The results indicated that the feeding habits of Saurogobio dabryi has strong regional and plasticity, which may be the result of adaptation to different aquatic ecological environment.
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