北太平洋柔鱼不同组织稳定同位素比值比较研究

Recently, stable isotope analysis has been a one of the most powerful tools for investigating the trophic dynamics of marine food web and reconstructing the trophic history of marine organsims. In this study, comparison on isotopic values of muscle and beak tissues of neon flying squid captured in the North Pacific Ocean (38 N~40 N,155 E~175 W) from May to July 2011 were conducted. Results showed that: δ15N values of muscles were significantly higher than beaks, while the δ13C values of muscles and beaks had no significant difference. Such difference may be related to the variation of different chemical and physical composition of the tissues. There was a decreasing trend in δ13C and δ15N values of beaks from the west to east longitute, which suggested a diet shift happened as squid migrate as well as variable basel isotopic values of different migration routines. The results will give supports for further studies on feeding behavior and trophic position of neon flying squid in North Pacific.