东海北部肥胖箭虫和百陶箭虫空间分布参数的特征

根据1997~2000年东海北部(27°~32°30′N、128°E以西)4个季节的浮游动物调查数据,运用K、α和β等分布型参数以及Taylor和Iwao模型分析肥胖箭虫和百陶箭虫的空间分布特征和季节变化。分析结果表明,肥胖箭虫和百陶箭虫的空间分布都符合负二项分布,最高密集区都为3号样区,春季和冬季呈均匀分布状态;肥胖箭虫主要于夏季高度密集,百陶箭虫的密集时间则为秋季,肥胖箭虫的最高聚集度和最大丰度分属不同季节,而百陶箭虫则同在秋季达到最高值。

On the parametric features of the spatial distribution of Sagitta enflata and Sagitta bedoti in the northern part of the East China Sea

Based on the Zooplanktonic data investigated in northern part of the East China Sea(from 27° to 32°30′N,westward 128°E) for four different seasons during 1997 to 2000,the relationship between the characters and seasonal change of Sagitta enflata Grassi and Sagitta bedoti Beraneck have been analyzed with distributive parameters such as K、α and β,furthermore,the spatial distributive characters of them have been analyzed with Taylor's and Iwao's method.These analyzed results showed that the spatial distribution of them was belonged to negative binomial distribution,and the highest concentration area of them was number 3 zone,both of them even distributed in most investigational zone in winter and spring.The Sagitta enflata concentrated in summer earlier than Sagitta bedoti which mainly concentrated in autumn,the highest value of congregation and quantity of Sagitta enflata appeared in different seasons,but these of Sagitta bedoti appeared only in autumn.