哥斯达黎加外海茎柔鱼耳石形态学分析  

Morphological analysis of statolith for jumbo flying squid (Dosidicus gigas) in the waters off Costa Rica

作　　者：贾涛[1] 陈新军[1,2,3] 李纲[1,2,3] 陆化杰[1] 刘必林[1,2,3] 马金[1] 

机构地区：[1]上海海洋大学海洋科学学院,上海201306 [2]上海海洋大学大洋生物资源可持续开发和利用上海市高校重点实验室,上海201306 [3]上海海洋大学大洋渔业资源可持续开发省部共建教育部重点实验室,上海201306

出　　处：《水产学报》2010年第11期1744-1752,共9页Journal of Fisheries of China

基　　金：上海市优秀学科带头人计划(10XD1402000);国家自然科学基金项目(NSFC40876090);上海市曙光跟踪计划(08GG14);教育部博士点基金(20093104110002);上海市捕捞学重点学科(S30702)

摘　　要：茎柔鱼是大洋性重要经济头足类,其耳石包含着重要的生态信息。根据2009年7-8月哥斯达黎加外海采集的茎柔鱼耳石样本,分析其耳石外部形态,探讨耳石形态差异及生长模式。研究认为,茎柔鱼左右耳石及其分区间的形态差异均不显著(P>0.05)。主成分分析认为,耳石总长(TSL)、吻侧区间长(RDL)、吻侧区夹角(RDA)可表征左耳石形态特征,TSL、吻区基线长(RBL)、RDA可表征右耳石形态特征。在整个生长过程中耳石各部分均异速生长,其形态变化趋势为整体狭长、吻区长窄、背区宽大,符合中上层头足类耳石特征。耳石生长表现为两个阶段,TSL为1600μm前后其耳石形态出现显著差异。RDL/TSL由上升变为下降(P<0.05),RBL生长速度迅速上升(P<0.01),RDA由下降变为上升(P<0.05),TSL=1600μm可作为栖息水层变化的重要标志。The jumbo flying squid（Dosidicus gigas） is one of the important economic cephalopods,the research on fishery biology is necessary to assess its stock size and to manage properly.Since the statolith is a better source of ecological information for cephalopod,the morphological analysis of statolith is fundamental to understand the fishery biology.According to the statolith morphology of jumbo flying squid caught in waters off Costa Rica from July to August in 2009,the morphology differences and growth patterns were analyzed.It was found that the overall morphological characteristics and various parts of left statolith were the same as the right by using statistical methods such as variance analysis and paired-t-test.These thirteen morphological parameters of statolith could be figured with six principal components by the method of principal component analysis,which indicated that the morphological features of the left statolith could be characterized by the total statolith length （TSL） ,rostrum lateral dome length（RDL） ,rostrum lateral dome angle（RDA） ,while for the right statolith TSL,rostrum baseline length（RBL） and RDA are characterized,respectively.Therfore the dorsal dome,lateral dome and rostrum dome played an important role in the overall changes of statolith morphology.The canonical correlation analysis showed that the growth of various parts were synchronized and allometric during the growth process,and the changing tendency of morphology was narrow body,long and narrow rostrum and large dorsal tallied with the characteristics of pelagic cephalopods statolith.According to the regression analysis,the growth relationships between TSL and RDL for left and right statolith were in line with the Logistic equation.Although the growth of RDL followed the increase of TSL,the growth rate of RDL declined throughout.There was significant change for RDL/TSL in the growth process.RDL/TSL increased or remained stable when TSL was less than 1 600 μm,but the proportion declined thereafter.The growth of

关 键 词：茎柔鱼 耳石 形态学 哥斯达黎加外海 

分 类 号：Q958.1[生物学—动物学] S917[农业科学—水产科学]