Abstract: Morphological differences in 18 morphological parameters among four populations (Anshan, Dalian, Shenyang and Panjin population) of Chinese grass shrimp (Palaemonetes sinensis) were studied using three multivariation analysis methods, including cluster analysis, principal component analysis and discriminant analysis. Cluster analysis revealed that the populations of Panjin and Anshan were clustered together due to the smallest difference in their morphology, while had a gradually increased difference with Dalian and Shenyang populations. The Mantel matrix tests showed that there was no significant relationship between geographic and  Euclidean distances (r=0.576, P=0.901). Seven principal components with an accumulative variance percentage of 84.74% were extracted by principal component analysis, and indicated the morphological differences mainly resulting from carapace characters. Four discriminant functions were obtained, with the discrimination accuracy being 66.00%-97.00%, and the integrated discrimination accuracy being 77.83%. The results provided a scientific basis for the protection and use of germplasm resources and for artificial selection breeding of Chinese grass shrimps.

Key words: solar radiation, land use type, optical fisheye lens, leaf area index