Spatial heterogeneity of Todarodes pacificus in East China Sea in winter

Abstract

Abstract: Based on the resources monitoring survey data of December 2002 at 121 sites of East China Sea,and by using the theory of geostatistics,this paper simulated the models of semivariograms for the density distribution of Todarodes pacificus,with semivariogram parameters and fractal dimension calculated,and the relationships between spatial pattern and environment studied.The results showed that under isotropic condition,the spatial heterogeneity of T.pacificus in northern and southern East China Sea was quite similar,and its semivariogram could be described by spherical model.The spatial pattern was aggregative,there was a strongly spatial dependence on higher proportion of spatially structured variance(70%)and a smaller random variance(30%)to total variance,and the range of autocorrelation extended to about 440 km.The anisotropic fractal dimension results indicated that the highest value in the direction of 135?(1.954)and 90?(1.893)of northern East China Sea was coincident with that of west-northward Yellow Sea warm current and eastward Changjiang River diluted water,respectively.The fractal dimension in the direction of 45皁f southern East China Sea was close to 2,indicating that T.pacificus distributed evenly in the direction corresponding with east-northward Kuroshio and Taiwan warm current.It was suggested that current was the main environmental factor affecting the distribution of T.pacificus.

Key words: Subalpine coniferous forest, Picea asperata, Betula albo-sinensis, Germination, Light, Temperature

CLC Number:

S932.4

ZHANG Hanye, HU Fen. Spatial heterogeneity of Todarodes pacificus in East China Sea in winter[J]. cje, 2005, (11): 1299-1302.

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