对应分析在法国Douarnenez海湾拟庸鲽食性研究中的应用(Ⅱ)

２．４拟庸蝶食性的对应分析２．４．１观察量和变量的分组观察量（捕食鱼类）依不同季节（冬、夏季）、不同性别（雌雄性）和不同性成熟状态（幼鱼和成鱼）来分组，因此得到８（２３）个观察量。对应分析的变量（饵料）首先根据个体生态的不同分为６个类型：游走多毛类，隐居多毛类，双壳类，不大游动的甲壳类（端足目和等足目），爬行甲壳类（十足国短尾部）和棘皮动物。其他６个类型的饵料生物（类、纽虫类、小型游泳甲壳类、腔肠动物、鱼类及苔藓虫类顺在分组时剔除，其原因为它们的出现可能少了些。考虑到捕食鱼类和饵料双壳类贝壳厚度…

APPLICATION OF THE CORRESPONDENCE ANALYSIS TO THE STUDIES ON FEEDING HABITS OF PLAICE Pleuronectes plattessa (LINNAEUS, 1758) IN DOUARNENEZ BAY OF FRANCE

This paper deal with the feeding habits of plaice Pleuronectes platessa L. living in Douarnenez Bay of France. The polychaetes and bivalves constitute the principal preys of the platoes in accordance with several common indices of preys. The upper limit of the shell thickness of the consumed bivalves rises as the predatory fish grows. The correspondence analysis of the intraspecific trophic relation of the platoes indicates that the rigidity and the vulnerability of essential preys, are closely associated with the predatory fish length. As the plaices grow with the increase of the hardness of their jaws, the difference of the feeding habits among the diverse-sized predatory fish is possibly due to their different feeding capacities. In the present paper, we also show that certain synthetic indices of the fish feeding habits are not always available.