基于几何形态测量学的黄蜻翅的雌雄二态性研究

Using geometric morphometrics to quantify the sexual dimorphism of Pantala flavescens

【目的】本研究运用几何形态测量学方法对黄蜻Pantala flavescens Fabricius前翅和后翅的雌雄二态性进行分析,探讨黄蜻雌雄性在翅上的形态差异。【方法】通过对黄蜻的前翅和后翅做数字化标点,获得翅的形态信息。经主成分分析(PCA)和薄片样条法(TPS)获得雌雄性在翅型和翅脉上的差异性。【结果】PCA结果表明,黄蜻雌雄性的前翅和后翅在翅型、翅脉结构上存在着明显差异,而且后翅间的差异更大。经TPS分析可知,雌雄性黄蜻前翅上的差异部位主要发生在亚翅结和三角室,后翅的差异部位主要发生在亚翅结、肘脉域和臀角区域。对黄蜻前后翅的大小分析(CS)可知,雌性黄蜻前后翅较大,雄性黄蜻前后翅较小。【结论】黄蜻雌雄性间的翅型结构差异性表明雌雄性在其各自生活史中履行不同的职责,特定的飞行模式逐渐形成特定的翅型、翅脉结构。

[Objectives] To quantify sexual wing dimorphism in Pantalaflavescent Fabricius. [Methods] We obtained wing shape information by digitizing the fore and hindwings ofP flavescens. Sexual dimorphism in wing shape and vein structure was then analyzed by principal component analysis （PCA） and the thin-plate spline （TPS） graphical technique. [Results] The PCA results indicate significant sexual dimorphism in the fore and hindwing. TPS indicates that forewing differences are mainly in the nodus and triangle, whereas hindwing differences were mainly in the nodus and in the area of the cubital and anal veins. Centriod size （CS） indicates that females have a bigger fore and hindwing than males. [Conclusion] Sexual dimorphism in wing shape in P flavescens probably reflects selection for different wing shape and vein structure in each sex.