文章摘要
性成熟和个体大小对西北印度洋鸢乌贼耳石形态的影响
Effects of sexual maturity and body size on statolith shape of Sthenoteuthis oualaniensis in the Northwest Indian Ocean
投稿时间:2020-07-29  修订日期:2020-11-16
DOI:
中文关键词: 鸢乌贼  耳石形态  性别  性腺成熟度  个体大小
英文关键词: Sthenoteuthis oualaniensis  morphology characteristic of statolith  sex  gonad maturity  size
基金项目:
作者单位邮编
王洪浩 上海海洋大学 201306
陆化杰 上海海洋大学 201306
刘凯 上海海洋大学 
陈炫妤 上海海洋大学 
何静茹 上海海洋大学 
陈新军 上海海洋大学 
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中文摘要:
      耳石是头足类最重要的硬组织器官之一,是研究头足类年龄与生长、种群结构和生活史的重要材料。【目的】本文研究了性成熟和个体大小对西北印度洋鸢乌贼耳石形态的影响,判别出耳石外形生长的拐点,为后续利用耳石研究鸢乌贼种群鉴定、生活史提供了科学依据。【方法】根据2019年2-5月我国灯光罩网渔船在西北印度洋海域调查生产期间采集的1009尾鸢乌贼Sthenoteuthis oualaniensis样本,以耳石总长(TSL)、侧区长(LDL)、翼区长(WL)和最大宽度(MW)作为耳石形态生长指标,以耳石最大宽度与其总长之比(MW/TSL)作为耳石相对尺寸生长指标,利用方差分析(ANOVA)和最小显著差多重比较法(LSD)研究性别、性腺成熟度以及不同胴长范围对耳石形态变化和相对尺寸变化的影响。【结果】结果表明,不同性别间TSL、LDL、WL和MW的变化存在极显著性差异(P<0.01),雌、雄样本不同性腺成熟度和不同胴长组间TSL、LDL、WL和MW的变化均存在极显著性差异(P<0.01);MW/TSL的变化在不同性别间不存在显著性差异(P>0.05),但在不同性腺成熟度和不同胴长组间存在极显著性差异(P<0.01)。【结论】研究表明,无论雌雄,性成熟和个体大小对西北印度洋海域鸢乌贼耳石的生长都会产生影响。性腺成熟度III期、胴长300-500mm是雌性鸢乌贼个体耳石外形的生长拐点,雄性耳石外形生长拐点不明显。
英文摘要:
      : Statolith is one of the most important hard tissues of Cephalopods to study the age and growth, population structure and life history of the Cephalopods.[Objective] In this paper, the effects of sexual maturity and body size on the statolith shape of Sthenoteuthisoualaniensisin the northwest Indian Ocean were studied, the growth inflection points of statolith shape was evaluated,which would provide a basis for the subsequent studies on the population identification and life history of the Sthenoteuthisoualaniensis. [Method] According to the samples of Sthenoteuthis oualaniensis totaled 1009 in number collected in the northwest Indian Ocean from February to May of 2019 by the Chinese light falling-net fishery fleets, the total statolith length(TSL), lateral dome length(LDL), wing length(WL) and maximum width(MW) are considered as the indicator of external form growth, and the ratio of MW to TSL is considered as the indicator of changes in statolith shape. The external form growth and statolith shape changes effected by sex, gonad maturity and individual size are analyzed by the analysis of variance(ANOVA) and Least-significant difference(LSD).[Result] The results indicated that the changes TSL, LDL, WL and MW between different sexes were statistically significant (P<0.01). For both female and male samples, the changes of TSL, LDL, WL and MW betweendifferent gonad maturity and different mantle length ranges were also statistically significant (P < 0.01).However, the ratio of MW to TSL changes in different sexes showed no significant differences (P > 0.05) and changes in different gonad maturity and different mantle length ranges showed verySsignificantSdifferences (P < 0.01).[Conclusion] The study shown that sexual maturation and size of Sthenoteuthis oualaniensis have an obvious effect on its statolith growth in both male and female. Stage III gonadal maturity and 300-500mm mantle length are the growth inflection points of statolith shape of female individuals, while there is no distinct inflection point in male individuals.
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