东太平洋茎柔鱼内壳形态差异性分析
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- 英文论文题名：Geographic variations of jumbo squid(Dosidicus gigas)based on gladius morphology
- 论文作者：贡艺 ; 陈新军 ; 李云凯 ; 方舟
- 英文论文作者：GONG Yi ; CHEN Xinjun ; LI Yunkai ; FANG Zhou ; College of Marine Sciences ; Shanghai Ocean University ; National Engineering Research Centre for Oceanic Fisheries ; Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources ; Ministry of Education
- 年：2016
- 作者机构：上海海洋大学海洋科学学院;国家远洋渔业工程技术中心;大洋渔业资源可持续开发省部共建教育部重点实验室;
- 论文关键词：茎柔鱼 ; 环境条件 ; 内壳 ; 地理群体 ; 形态学
- 英文论文关键词：Dosidicus gigas ; Environmental condition ; Gladius ; Geographic population ; Morphology
- 会议召开时间：2016-11-02
- 会议录名称：2016年中国水产学会学术年会论文摘要集
- 语种：中文
- 分类号：S917.4
- 学会代码：OGSB
- 会议名称：2016年中国水产学会学术年会
- 会议地点：中国四川成都
- 主办单位：中国水产学会、四川省水产学会
- 学会名称：中国水产学会
- 页数：1
- 文件大小：560k
- 原文格式：D
- 会议级别：全国
摘要
本文以形态学测量法分析不同海洋环境下茎柔鱼各地理群体间差异。共测量采集自秘鲁、哥斯达黎加和中东太平洋赤道海域460根内壳样本的7项形态学指标。以海表温度(SST)、叶绿素浓度(Chl-a)和流速表征海洋环境,探究其对内壳形态的潜在影响。结果表明,雌、雄个体内壳形态存在显著差异,且基于内壳形态的各地理群体判别正确率达84.3%,但未达到亚种群级别。SST较高的海域和充足的食物有利于内壳叶轴(proostracum)的经向生长。而相对较长的尾锤(conus)可为鳍提供足够的支撑以适应高流速的海域。本结果证明内壳形态用于区分茎柔鱼地理群体的可行性,同时表明内壳形态差异可能与其对栖息海域环境的适应性有关。
Morphometric analysis was used to explore the geographic variation of population units within jumbo squid(Dosidicus gigas) under distinct environmental conditions. Seven morphometric characteristics were measured from 460 specimens collected off Peru, Costa Rica and equatorial central eastern Pacific. Sea surface temperature(SST), chlorophyll-a concentration(Chl-a) and current velocity(CV) were used to evaluate the potential effects of environmental conditions on phenotypic divergence in the gladius. Significant differences were found between sexes and population units. Results from discriminant analysis showed an overall correct classification rate of 84.3%. However, stable population substructuring did not happen. Water of a high temperature and sufficient food availability was more appropriate to the longitudinal growth of the proostracum. A longer conus could provide sufficient reinforcement for fin locomotion to accommodate the higher speed current field. These results support our general hypothesis that the shape of the gladius can be used to distinguish geographic populations and this variation in gladii shape occurs as an adaptation to environmental conditions.
Morphometric analysis was used to explore the geographic variation of population units within jumbo squid(Dosidicus gigas) under distinct environmental conditions. Seven morphometric characteristics were measured from 460 specimens collected off Peru, Costa Rica and equatorial central eastern Pacific. Sea surface temperature(SST), chlorophyll-a concentration(Chl-a) and current velocity(CV) were used to evaluate the potential effects of environmental conditions on phenotypic divergence in the gladius. Significant differences were found between sexes and population units. Results from discriminant analysis showed an overall correct classification rate of 84.3%. However, stable population substructuring did not happen. Water of a high temperature and sufficient food availability was more appropriate to the longitudinal growth of the proostracum. A longer conus could provide sufficient reinforcement for fin locomotion to accommodate the higher speed current field. These results support our general hypothesis that the shape of the gladius can be used to distinguish geographic populations and this variation in gladii shape occurs as an adaptation to environmental conditions.
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