渤海底拖网主要渔业生物类别时空分布的初步研究

A preliminary study of spatio-temporal relationship among three groups of fishery species caught in bottom trawl survey in the Bohai Sea

为研究目前渤海主要渔业生物的时空关系,文章依据2014年~2015年渤海双船底拖网4个季度调查数据,初步分析了渤海三类主要渔获物(鱼类、甲壳类和头足类)的水平空间分布特点、空间距离及四季变化特征。结果显示,三类生物的主要分布区水平方向上存在空间分化现象,且随着三类生物集中分布区聚集程度的提高,空间分化现象越来越明显。三类生物的水平空间分布距离在季节上表现出夏、秋季(平均欧氏距离,夏季为75.91;秋季为44.76)较远,冬、春季(冬季为8.55;春季为11.81)较近的特点。三类生物间,头足类与甲壳类的距离相对较近(平均欧氏距离,24.44),而头足类与鱼类(40.07)、鱼类与甲壳类(38.27)的距离相对较远。

To investigate the spatio-temporal relationship among the main fishery resources in the Bohai Sea, we carried out a bottom trawl survey there from August 2014 to May 2015, and then made a preliminary analysis of the horizontal spatial distribution, spatial distance and the seasonal characteristics of three groups of fishery resources. The results showthat the concentration areas of the three groups of fishery resources demonstrated spatial differentiation. The trend of spatial differentiation became more and more significant, as the concentration areas of the three groups aggregated. The distance among three groups was longer in summer and autumn than in winter and spring. Among the three groups of fishery resources, the distance between cephalopoda and crustacean was relatively short, while the distances between cephalopoda and fish, and fish and crustacean were relatively longer, which was associated with difference of the locomotivity of the three groups of organisms.