不同水域刀鲚形态的分析比较

选取采于黄海吕泗渔场(吕泗群体)和大沙渔场(大沙群体),长江口崇明岛(崇明群体),长江芜湖江段(长江芜湖群体),钱塘江口舟山东霍山(舟山群体),黄河东营江段(黄河群体)的刀鲚,测量全长、体长等14个可量性状和20个框架结构数据并计算肥满度。针对不同性别和不同水域的刀鲚所测得的形态学数据进行多元统计分析。结果表明,雌雄刀鲚在体长上没有显著性差异,在肥满度上雌性显著大于雄性,在反映躯干纵向长度的性状和框架结构上,雌性也显著大于雄性;两个黄海群体的形态与长江崇明和芜湖群体最为接近,与舟山群体和黄河群体都有显著差别,显示黄海群体最有可能洄游进入长江,与长江两群体间具有关联性;而舟山群体和黄河群体可能较独立于其它群体,关联性不明显。

A comparative study of the morphology of different geographical populations of Coilia nasus

In the present study 14 morphological traits(e.g.,total length,standard length,eye diameter)and 20 truss network characters were measured with different populations of Coilia nasus (CN),which were collected from Lvsi(LS) and Dasha fishing ground(DS)of the Yellow Sea,Chongming island(CM)of the Yangtze River estuary,Wuhu section in the Yangtze River(WH),Zhoushan Islands(ZS)in the Qiangtang River stuary,and Dongying section in the Yellow River(HH).Morphological differences between male and female C.nasus were analyzed by One-Way ANOVA analysis,principal components analysis and discriminant analysis,while morphological features of different populations were also comprehensively analyzed by Kruskal-Wallis H test,principal components analysis and discriminant analysis.Results indicated that the sexual size dimorphism was not significant in C.nasus, and there were no significant differences between male and female individuals except relative fatness,body depth at dorsal,body depth at anus,caudal peduncle depth and other 5 truss network characters.Additionally,cephalic traits among LSCN,DSCN,CMCN and WHCN were similar,while those of ZSCN and HHCN were relatively unique.The intergraded morphological features of former four populations(LSCN,DSCN,CMCN and WHCN)were significantly different from the remaining two populations(i.e.,ZSCN and HHCN),suggesting that the latter might be relatively independent and might have weak connectivity with the former populations.