Sexual size dimorphism in the lizard Oplurus cuvieri cuvieri (Squamata, Opluridae) from Madagascar
Sexual size dimorphism in the lizard Oplurus cuvieri cuvieri (Squamata, Opluridae) from Madagascar
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马达加斯加蜥蜴 Oplurus cuvieri cuvieri（有鳞蜥蜴，Opluridae）的性别大小二态性
DOI：
10.1080/15627020.2000.11657101
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发表时间：
2000
期刊：
影响因子：
1.1
通讯作者：
H. Randriamahazo
中科院分区：
文献类型：
--
作者：
H. Randriamahazo
介绍了马达加斯加干落叶林特有的中型蜥蜴Oplurus cuvieri cuvieri的性别大小二态性。成虫在身体大小、头部大小和尾巴长度上是两性二态的。雄性的口鼻长度（SVL）、头深、头宽、下巴长度、尾巴长度和体重都比雌性大。雄性幼崽的年SVL增长率高于雌性幼崽，这导致了成年雄性大小的二态性。此外，在成年后，头部深度和宽度的增长速度在两性之间存在显著差异，因此在给定的体型下，成年雄性的头部比成年雌性的头部更大。在自然选择的基础上，提出了三种可能导致黄鳍鱼成虫头部大小性别差异的机制；减少两性间的食物竞争、雄性获得配偶的性选择以及雌性异速生长的个体发生变化以提高生殖产量。
Sexual size dimorphism in the medium-sized lizard Oplurus cuvieri cuvieri, which is endemic to the dry deciduous forest of Madagascar, is presented. Adults are sexually dimorphic in body size, head size, and tail length. Males have a greater snout–vent length (SVL), head depth, head width, jaw length, tail length and body mass than females. Juvenile males have greater annual SVL growth rates than juvenile females, contributing to adult sexual size dimorphism. Moreover, the rates of increase in head depth and width differ significantly between the sexes after reaching maturity so that adult males have larger heads for a given body size than adult females. I suggest three proximate mechanisms that may cause sex-related differences in adult head size of O. c. cuvieri based on natural selection; to reduce intersexual food competition, sexual selection involving mate acquisition in males, and ontogenetic change of allometry to improve reproductive output in females.