摘要
根据南黄海鳀（Engraulis japonicus）和赤鼻棱鳀（Thrissakarnrnalensis）及其饵料的碳氮稳定同位素比值，采用IsoSource软件计算了两者饵料的质量贡献比。发现二者食物来源较为一致，其中仔稚鱼对鳀和赤鼻棱鳀的质量贡献率分别为42％～50％和53％～70％，是两者的首要能量与营养源。在获得食物贡献比的基础上，分别采用食物重叠指数法、聚类分析法和稳定同位素法3种方法，针对5种不同的摄食条件，依次对鳀与赤鼻棱鳀的食物重叠度进行计算。其中在饵料平均贡献比条件下，3种方法的计算结果相差不大，都在70％左右，计算偏差≤5％。研究结果表明，两者的食物竞争主要是针对仔稚鱼展开的，两者间存在显著的食物竞争关系。[中国水产科学，2007，14（4）：630—636]
Stable isotopes have been used in many research fields as natural labels, and are becoming more and more appropriate option for aquatic ecological studies. An organism＇s stable isotope ratios（δ^15N and δ^13 C, 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, the ratios can change with different food,are good labels of organism living conditions. According to the stable isotope ratio of an organism and its preys,we can judge its food composition. On the basis of the prey pro- portions of the Engraulis japonicus and Thrissa kammalensis determined by stable isotope technology. The proportions of all food sources showed that larvae and juvenile fish were the most important prey to E. japonicus and T. kammalensis, whose proportions were 42 % - 50 % and 53 % - 70 %, respectively. On the basis of food proportions, we calculated the prey overlap between the two fish species with three methods, diet overlap index, Cluster analysis and stable isotope technology, respectively. The mean result of each method was about 70 %. There no significant difference among results of the three methods, with calculate error less than 5 %. From the results of the research, we speculated that the larva and juvenile had the highest proportion, which was the main energy and trophic source of the two fish species. From the result of the research, we speculated the nitrogen stable isotope can used to calculate the food overlap of species. [Journal of Fishery Sciences of China,2007,14（4）：630- 636]
出处
《中国水产科学》
CAS
CSCD
北大核心
2007年第4期630-636,共7页
Journal of Fishery Sciences of China
基金
国家自然科学基金重大项目(30490233)
国家自然科学基金面上项目(30570293)
黄海水产科学研究所博士生启动基金(61200603)
关键词
鳀
赤鼻棱鳀
南黄海
食物竞争
稳定同位素
Engraulis japonicus
Thrissa kammalensis
southern Yellow Sea
food competition
stable isotope
