Abstract Lizards of the genus Gallotia, endemic to the Canary Islands, show morphological and colouration varieties that are related to within island variation in orographic and climatic characteristics. This study examines sexual size dimorphism (SSD) within and between population variation in morphological traits, and scaling relationships in G. sthelini from a southwestern locality (Tasartico) and from another (Gáldar) in the northwest of Gran Canaria. Both sites differ in climate and vegetation traits, and we hypothesised that SSD should be manifested by males having relatively larger body traits than females and that hind limb lengths should be relatively larger in individuals from the more open habitat. Results showed that one-third of the largest lizards from both populations did not differ significantly either in snout-to-vent length (SVL) nor in trunk length (TRL), but overall males had significantly larger SVL and TRL than females. Multivariate analysis showed that head width (HW) and hind limb length (HLL) were significantly larger in individuals from Tasartico than in those of Gáldar. Hind limb length was the trait that contributed most to differentiate between populations and head parameters between males and females. In both populations head and body traits scaled to TRL, head width (HW) and head depth (HD) of males having a positive allometry, and fore limb length (FLL) and hind limb length (HLL) a negative one. In relation to head length (HL), females had significantly larger TRL and smaller head depths than males; lizards from Gáldar had significantly larger trunk length (TRL), but smaller HW and HLL than those of Tasartico. We outline the multiple factors that could affect the evolution of morphometric traits of each sex, taking into account the ecological features of the two zones.

中文翻译：

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来自大加那利岛的Gallotia stehlini（Fam. Lacertidae：Squamata）两个种群的形态特征和尺度关系的性别二态性

摘要 Gallotia 属的蜥蜴是加那利群岛特有的，表现出与岛屿内地形和气候特征变化有关的形态和颜色变种。本研究检查了来自西南部地区 (Tasartico) 和来自大加那利岛西北部的另一个地区 (Gáldar) 的 G. sthelini 的形态特征种群变异内部和之间的性别大小二态性 (SSD)。两个地点的气候和植被特征不同，我们假设 SSD 应该由具有比女性更大的身体特征的男性表现出来，并且来自更开放栖息地的个体的后肢长度应该相对更大。结果表明，来自两个种群的三分之一最大的蜥蜴在鼻子到排气口的长度 (SVL) 和躯干长度 (TRL) 方面都没有显着差异，但总体而言，雄性的 SVL 和 TRL 明显大于雌性。多变量分析表明，Tasartico 个体的头部宽度 (HW) 和后肢长度 (HLL) 明显大于 Gáldar 个体。后肢长度是最有助于区分雄性和雌性之间的种群和头部参数的特征。在这两个种群中，头部和身体特征均按 TRL 缩放，雄性的头部宽度 (HW) 和头部深度 (HD) 具有正异速生长，而前肢长度 (FLL) 和后肢长度 (HLL) 为负值。关于头部长度（HL），女性的 TRL 明显大于男性，头部深度更小；来自 Gáldar 的蜥蜴的树干长度 (TRL) 明显更大，但比 Tasartico 的蜥蜴的 HW 和 HLL 更小。考虑到两个区域的生态特征，我们概述了可能影响每个性别形态特征进化的多种因素。