| 摘要: |
| 利用2007 年9 月至2010 年9 月采自北部湾海域的24 尾红棘金线鱼(Nemipterus nemurus)、 32 尾金线鱼(N. virgatus)、36 尾深水金线鱼(N. bathybius)和35 尾日本金线鱼(N. japonicus)性成熟后的矢耳石样本, 运用几何形态测量学方法研究了4 种鱼类矢耳石形态识别问题。耳石经图像处理后提取地标点坐标值, 进行相对扭曲主成分分析, 通过判别分析区分4 种金线鱼的耳石, 利用薄板样条分析和网格变形分析耳石形态变异。结果表明: 在相对扭曲主成分分析中, 第1、2、3 主成分分别解释了总变异的30.78%、28.44%和11.75%, 可以将四种金线鱼耳石区分开来。其中Ⅰ型地标点6、10、11, Ⅱ型地标点2, Ⅲ型地标点7, 贡献作用较大, 解释了主要形态变异。相对扭曲主成分的逐步判别分析中, 四种鱼的平均判别成功率达91.3%; 交互验证结果显示, 四种鱼的平均判别成功率达89.8%, 表明几何形态测量学分析可以作为鱼种耳石识别的有效方法之一, 在耳石形态学与鱼种判别研究中具有重要应用价值。 |
| 关键词: 矢耳石 几何形态测量学 地标点法 薄板样条分析 判别分析 金线鱼属 |
| DOI：10.11693/hyhz20130300006 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目, 41006084 号; 广东省海洋渔业科技推广专项, A201208H01 号; 广东省自然科学基金资助项目, 10152408801000013 号; 科技部科技支撑项目, SQ2012BAY307301 号; 农业部南海渔业资源监测专项调查项目(2010—2013) |
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| GEOMETRIC MORPHOMETRICS OF SAGITTAL OTOLITH OF FOUR NEMIPTERUS FISH SPECIES |
|
Hou Gang
|
|
Guangdong Ocean University
|
| Abstract: |
| Identification of sagittal otoliths was investigated in geometric morphometrics among four sympatric species of genus Nemipterus: redspine thread?n bream N. nemurus (n=24), golden threadfin bream N. virgatus (n=32), yellowbelly thread?n bream N. bathybius (n=36), and Japanese thread?n bream N. japonicus (n=35). Specimens were collected in Beibu Gulf from September 2007 to September 2010. Landmark coordinate values were extracted after otolith digitized by processing image using relative Warp (RW) as principal component, and grad distortion via thin plate spline. Eighteen RW values were used to differentiate the otoliths among four Nemipterus species. The result indicate that the 1st, 2nd and 3rd RWs accounted for 30.78%, 28.44%, and 11.75% of the total variation, respectively, among which Type I landmarks 6, 10, and 11, Type II landmarks 2, and Type III landmark 7 are important contributors, and could explain the most variation. Success in identifying the otolith could reach 91.3% by RW-based gradual discrimination, or 89.8% by cross validation, indicating that the geometric morphometrics is a potential tool in distinguishing Nemipterus species with otolith. |
| Key words: sagitta otolith geometric morphometrics landmark method thin plate spline analysis discriminant function analysis Nemipterus |
