[Spatial heterogeneity of pelagic fishery resources in the East China Sea].
Quantitative description of spatial heterogeneity can help the understanding of the distribution of fishery resources and its relationship with the environment from ecological view. Based on geographic information system, the Geary index for the density distribution of pelagic fish was calculated, and the semivariograms were drawn. The Geary value c was 0.25 and Co/(Co + C) was 19.1%, indicating that the distribution of the pelagic fish had a high spatial autocorrelation with anisotropy. The sharp slope of semivariogram in the directions of 45 degrees and 135 degrees meant that there existed important dynamic environmental processes in the two directions. The annual fluctuation of fishery resource density was caused by the spatial autocorrelation, because the density had a significantly positive correlation with value C, but no correlation with Co. The fractal dimension D was negatively correlated with the density, meaning that the density increase was resulted from the increase of spatial fish centralizing.
Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China. sufz@lreis.ac.cn
Fenzhen
F
Su
Chenghu
C
Zhou
Tianyu
T
Zhang
Yunyan
Y
Du
Changqin
C
Yao
D000818:Animals; D004463:Ecology; D005398:Fisheries; D040362:Geographic Information Systems