论文部分内容阅读
根据2000-2002年秋季和冬季在南黄海进行的定点底拖网调查,利用多元统计分析方法,研究了黑鳃梅童(Collichthys niveatus)、皮氏叫姑鱼(Johnius belengerii)和小黄鱼(Pseudosciaena polyactis)的食物组成及其差异,摄食随海区、季节和体长的变化,以及3种石首鱼类摄食器官的形态差异对摄食的影响。结果表明:(1)3 种鱼的优势饵料生物各不相同,食物组成存在显著差异;(2)3种鱼的食物组成均随海区和季节的不同而有显著的差异;(3)3种鱼的食物组成和饵料多样性都有明显体长变化,黑鳃梅童和皮氏叫姑鱼的饵料多样性随体长的增大而升高,小黄鱼则相反;(4)黑鳃梅童和小黄鱼种内不同体长间的食物重叠指数较高,而皮氏叫姑鱼则较低,3种鱼的种间食物重叠指数位于0.50-0.56;(5)主成分分析(PCA)表明,黑鳃梅童和小黄鱼摄食器官的形态特征与皮氏叫姑鱼存在一定的差异。
Based on the bottom-trawl surveys conducted in autumn and winter in the South Yellow Sea during the years 2000-2002, the authors studied the effects of Colickythys niveatus, Johnius belengerii and Pseudosciaena polyactis using multivariate statistical analysis. The composition of the food and its difference, the change of feeding with the sea area, the season and the body length, as well as the morphological difference of the feeding organs of the three kinds of stonefish on the feeding. The results showed that: (1) The predominant bait organisms of the three species of fish differed from each other, with significant differences in the composition of the food; (2) The food composition of the three species of fish varied significantly with the sea area and the seasons; (3) The composition and the diversity of bait showed significant changes in body length. The diversity of bait of Black gill Prunus mongolica and Cephalopus spp. Increased with body length increasing, while that of yellow croaker was the opposite. (4) The index of food overlap between different body length was higher, while the skin index was lower, the inter-species food overlap index of three species of fish was between 0.50 and 0.56. (5) Principal component analysis (PCA) And yellow croaker feeding organ morphological characteristics and Pei called Aunt there are some differences.