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根据2012和2013年在南海中南部采集到的3177尾鸢乌贼中型群样品,对其胴长(ML)、右第一腕长(AL1)、右第二腕长(AL2)、右第三腕长(AL3)、右第四腕长(AL4)、右触腕长(TL)、鳍长(FL)和鳍宽(FW)等形态参数进行测定,并运用主成分分析等方法对其个体的形态差异进行研究.结果表明:研究海域的鸢乌贼中型群可分为Ⅰ和Ⅱ2个群体,分别占总数的69%和31%.2个群体的雌性比例均随胴长的增大呈先减少后增加的趋势,直至达到100%;群体Ⅰ雌性和雄性的初次性成熟胴长分别为164和112 mm,群体Ⅱ雌性和雄性初次性成熟胴长分别为157和108 mm.群体Ⅰ在西沙海域和南沙海域均有独立分布区域,而群体Ⅱ密集区主要分布于南沙海域.非参数检验表明:2个群体雌性和雄性个体的全部形态参数均存在显著性差异(P<0.05).在雌性鸢乌贼中,群体Ⅰ和群体Ⅱ的ML、AL1、AL2、AL4、TL和FW存在显著性差异(P<0.05);在雄性鸢乌贼中,群体Ⅰ和群体Ⅱ的ML、AL1、AL2、AL3、AL4和FL存在显著性差异(P<0.01).通过计算差异系数表明,2个群体的形态差异处于种内水平.
Based on the 3177 samples of Symlectoteuthis oualaniensis collected in southern and southern part of South China Sea in 2012 and 2013, we analyzed their length of the carcass (ML), first right wrist length (AL1), second right wrist length (AL2), right third wrist (AL3), right fourth wrist length (AL4), right wrist length (TL), length of fins (FL) and width of fins (FW) and other morphological parameters were measured, and the use of principal component analysis and other methods of its individual Morphological differences were studied.The results showed that the population of Symlectoteuthis oualaniensis was divided into two groups, Ⅰ and Ⅱ, accounting for 69% and 31% of the total, respectively.The females in the two groups decreased first And then increased until reaching 100% .The first mature males of females and males of group I were 164 and 112 mm, and the first mast length of females and males of group II was 157 and 108 mm, respectively. And Nansha sea area, while the population-rich area Ⅱ mainly distributed in the Nansha sea area.Non-parametric tests showed that there were significant differences in the total morphological parameters between female and male individuals (P <0.05) In cuttlefish, ML, AL1, AL2, AL4, TL and FW of group Ⅰ and group Ⅱ were significantly different (P <0.05) Of oualaniensis, there ML groups Ⅰ and group Ⅱ in, AL1, AL2, AL3, AL4 and FL significant difference (P <0.01). By calculating the difference coefficients show morphological difference between the two populations are within the species level.