长江口及南黄海水域春季生物摄食生态的稳定同位素研究

Study on feeding habits of organisms from Changjiang Estuary and adjacent Southern Yellow Sea in spring with stable isotope technology

根据长江口及毗邻南黄海水域多种生物的碳稳定同位素比值,计算其摄食生态类型,结果表明,一些生物的摄食生态类型计算结果存在时空与计算方法差异,其原因是生物的食性存在季度或年际上的时间变化,并会随栖息环境的变化而相应发生改变;统一稳定同位素法与胃含物分析法计算生物摄食生态的判断类型后,2种方法计算的结果基本一致,24种共有生物有21种生物的判断结果一致,推断稳定同位素法计算生物摄食生态类型可行。

Stable isotopes have been used in many research areas as natural labels, and are becoming the more appropriate option for the aquatic ecological studies. An organism＇ s stable isotope ratios （δ^13N and δ^13C etc） are an integration of the isotopic signatures of preys that have been assimilated through time, the organism will come into isotopic equilibrium with its diets depending on growth and tissue turnover rates, and the ratios can change with different food, are good labels of organism living conditions. According to the carbon stable isotope ratio of organisms from Changjian Estuary and adjacent Southern Yellow Sea in spring, we calculated their feeding habits. It is found that, （1） the feeding habits of some organisms calculated with stable isotope method or stomach analysis method in Changjians Estuary and Southern Yellow Sea were different, we could speculate that the energy sources of the two areas were different or some organisms could change with the habits, change their food sources with time and areas; （2） if the feeding habit types of stomach isotope analysis method was the same to that of stable isotope technique, only three organisms had different feeding habits in twenty-four common organisms, which showed the table isotope technique could be used to calculate the feeding habit of organism, and it had many advantages in calculating feeding habits of organism in different areas or time.