Study of the Distribution of Nekton Diversity Base on Spatial Interpolation Methods in the Yellow Sea and North East China Sea

Abstract:

The distribution of species diversity is one of the important issues in ecological research. Although spatial interpolation has been widely used in this research. Taking the diversity of nekton in the Yellow Sea and north East China Sea in May 2017 as an example, the species number (S), Shannon-Weaver diversity index (H'), Pielou evenness index (J), and Margalef richness index (d) were selected to evaluate the distribution of species diversity in the sea area. We applied inverse distance weighted (IDW), radial basis function (RBF), local polynomial interpolation (LPI), ordinary kriging (OK), and ordinary cokriging (COK) methods to the above four species diversity indices, and we selected the spatial interpolation method suitable for each species diversity index by the jackknife method. The results showed that COK had the best results for the four species diversity indices with the highest accuracy. The accuracy of the other four methods had little difference and was low. The COK prediction results revealed that both S and d showed an obviously high pattern in the southeast, followed by the north; the lowest pattern was observed in the middle. H' and J were also lowest in the middle, but the difference between the southern and northern sea was negligible in both these indices, and the reasons need to be further explored. The four diversity indices were roughly the same in the high value area of the south of 32°N. The results showed that COK can be used as a spatial interpolation method for nekton diversity in the Yellow Sea and northern East China Sea.