摘要
根据2011年3、5、9和12月在海州湾及邻近海域进行的渔业资源底拖网调查数据,探索枪乌贼和蛸类的资源密度重心分布的差异,通过变异函数对该海域枪乌贼和蛸类的空间结构特征进行了分析,并运用克里金插值法对枪乌贼和蛸类在海州湾及邻近海域的资源密度进行预测。结果表明,在海州湾及邻近海域蛸类的资源密度大于枪乌贼,枪乌贼资源密度在9月时有一个高峰期,分布在35°N以北、120.5°-121.0°E之间的海域,而蛸类在12月份为高峰期,分布在120.5°E两侧的海域。枪乌贼的分布重心相较于蛸类分布在远岸海域,统计分析表明,除3月分布重心的差异显著外(p<0.05),其他月份的差异均不显著。枪乌贼资源密度的月间分布差异较大,空间自相关格局不稳定,而蛸类的空间分布有较为稳定的结构,呈现中等的空间自相关性。枪乌贼空间自相关的尺度大于蛸类,而两者的空间结构可能受人为因素的较大影响。对枪乌贼和蛸类空间分布差异的研究可为头足类资源的开发利用以及后续的研究奠定基础。
According to the survey data collected in March, May, September and December of2011 using bottom trawls in Haizhou Bay and adjacent waters, we explored the difference of the distributional center of gravity between squid and octopus, analyzed their spatial structure with the semivariaogram, and used the kriging interpolation method to predict their density. The results showed that the resources density of squid was larger than octopus, and there is a peak of squid density in September, which located in the north of 35°N and between 120.5°-121.0°E. The density of octopus peaked in December, located near 120.5°E.The center of gravity of squid density was further to the coast than octopus. The center of gravity of the two species had no significant differences in the survey period, except in March. The density of squid varied remarkably among months, and the spatial structure was not stable. On the contrary, the spatial distribution of octopus was more stable and showed medium level of spatial structure. The scale of the spatial autocorrelation of squid is greater than that of octopus, while both might be strongly influenced by human activities.
引文