Morphological variation of Lagocephalus spadiceus in seven geographical populations from Beibu Gulf and its adjacent waters
Lagocephalus spadiceus,belonging to Tetraodontiformes,Tetraodntoiaei,Tetraodontidae,is widely distributed along the south China coast.It has high nutritional and economic values.Due to the widespread and ambiguous population structure of L.spadiceus,a total of 278 individuals from offshore seas of Beibu Gulf(Beihai,Zhanjiang,Leizhou,Danzhou,Dongfang)and its adjacent sea areas(Maoming and Zhangzhou)were collected in this study.Multivariate morphometric methods were used to investigate the morphological differentiation of seven populations of L.spadiceus based on the proportional data of 14 measurable indices and 16 frame structure indices.The results of one-way analysis of variance(ANOVA)indicated no significant difference in the caudal peduncle height/body length(CPH/BL)and end of anal fin base to origin of anal fin/body length(G-H/BL).The scatter plot of the principal components showed that the morphological characteristics of populations from Maoming and Zhangzhou were different from those of others.PC1 indicated the differences in the head,while PC2 showed the differences in the tail.Two groups were categorized based on morphological similarity by cluster analysis.One group consisted of populations from Beibu Gulf,and the other group was composed of 5 populations outside Beibu Gulf(Maoming and Zhangzhou).The discriminant functions of 7 populations were constructed by discriminant analysis,and the comprehensive discriminant accuracy rate was 82.79％,the population from Zhangzhou had the highest discrimination accuracy(100.00％),while the population from Danzhou had the lowest discrimination accuracy(68.42％).The head length and tail length were identified as the main differences among different populations of L.spadiceus,which might be caused by differences in diet and habitat utilization.The results can provide scientific support for the resource conservation and management of L.spadiceus.
万方数据
维普
