山东近海底层鱼类资源空间异质性

本文根据2016?2017年山东近海渔业资源底拖网季度调查数据,应用多项空间自相关指标和变异函数,分析了山东近海底层鱼类资源的空间自相关性与空间异质性.结果表明,山东近海底层鱼类资源呈现出显著的空间聚集格局,存在着空间自相关性,其中在春季、夏季和冬季的空间自相关性较强,在秋季的空间自相关性较弱.从空间分布上来看,底层鱼...

Spatial heterogeneity of demersal fish in the offshore waters of Shandong

According to the bottom trawl survey data of fishery resources in the offshore waters of Shandong from 2016 to 2017, the spatial autocorrelation and spatial heterogeneity of demersal fish in the offshore waters of Shandong were examined by using spatial autocorrelation indices and variogram. The results showed that there were significant spatial aggregation patterns and spatial autocorrelation in the demersal fish in the offshore waters of Shandong. The spatial autocorrelations were strong in spring, summer and winter, and weak in autumn. From the perspective of spatial distribution, the areas of high relative abundance index of demersal fish were mainly located in the southern waters of Shandong in spring and summer, and areas of high relative abundance greatly decreased in autumn and winter, while the areas of low value were mainly in the Laizhou Bay and adjacent waters in four seasons. The parameters of variogram showed that there was a strong nugget effect in autumn, and the spatial heterogeneity of random part accounted for 76.0% of the total spatial heterogeneity. The spatial heterogeneity of random part in spring, summer and winter only accounted for 26.2%, 27.7% and 23.6% of the total spatial heterogeneity. In the spatial autocorrelation and spatial heterogeneity of demersal fish showed seasonal variation in the offshore waters of Shandong, which was to some extent related with changes in environmental factors such as water temperature.