Geometric Morphometric Analysis of Morphological Variation in Populations of Scophthalmus maximus
To explore the external morphological characteristics of Scophthalmus maximus from different introduced and cultured populations with geometric morphometric method basing on landmarks.The morphological characteristics of S.maximus from Iceland,Denmark,France,Chile(four introduced groups)and Rizhao,Weihai(two cultured groups)were compared and analyzed.The principal component,canonical variable,discriminant analyses were completed and visualized using TPS series software and Morpho J software according to 30 landmarks.The results of principal component analysis showed that the first,second and third principal components explain 25.59％,16.98％and 10.50％of the total variation,respectively,with a cumulative contribution rate of 53.07％.The different populations distributed in an overlapping manner.However,the results of canonical variable analysis showed that the first and second canonical variables account for 55.80％and 19.20％of the total,respectively,with a cumulative contribution rate of 75％.Except for the two cultured populations,other populations were significantly different from each other.From the Mahalanobis and Phisical distances,it can be seen that the distance between two cultured populations is the shortest.The contribution rate of different landmarks in relative distortion showed that the contribution rates of typeⅠ landmark 9 and type Ⅱ landmarks 12,8,4,5 were relatively large,with a total contribution rate of 70.52％.Combined with the grid deformation map,it was found that the morphological variation of turbot populations mainly occurs in the jaws and gill arches.The overall discrimination accuracy rate of stepwise discriminant analysis and cross-validation analysis was 94.40％and 91.70％,respectively,which can effectively distinguish S.maximus populations.We found also that there are significant morphological differences between introduced and cultured populations.The external morphology of cultured population showed a convergence phenomenon.It is recommended that each introduced population should be preserved independently,and the introduction of parent fish should be regularly supplemented,updated and reinforced.
万方数据
维普
