Trophic ecology of small yellow croaker (Larimichthys polyactis Bleeker): stable carbon and nitrogen isotope evidence |
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| Authors: | Weiwei Ji Xuezhong Chen Yazhou Jiang Shengfa Li |
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| Institution: | JI Weiwei 1,2,3,CHEN Xuezhong 2,JIANG Yazhou2,LI Shengfa 2,** 1 Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China 2 East China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Shanghai 200090,China 3 Graduate University of Chinese Academy of Sciences,Beijing 100049,China |
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| Abstract: | The trophic ecology of the small yellow croaker (Larimichthys polyactis) was studied using stable isotope analyses. Samples were collected from July to September 2009 and 34 individuals from eight
sites were examined for stable carbon and nitrogen isotopes. Stable carbon isotope ratios (δ
13C) ranged from ?20.67 to ?15.43, while stable nitrogen isotope ratios (δ
15N) ranged 9.18–12.23. The relationship between δ
13C and δ
15N suggested high resource partitioning in the sampling area. Significant differences in stable isotope values among the eight
sampling sites may be linked to environmental diversities involving various physical processes (such as ocean current, wind
and tide) and different carbon sources. Furthermore, the stable isotope ratios may also explain the ontogenetic variability
in diet and feeding, because δ
13C and δ
15N varied significantly with increasing body size. The findings are consistent with other studies on diet analyses in small
yellow croaker. It was also demonstrated that stable isotope analysis could be used to estimate the trophic characters of
small yellow croaker in feeding patterns and migrating habits. |
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| Keywords: | small yellow croaker stable isotope analysis trophic strategy East China Sea |
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