Space use and genetic structure do not maintain colour polymorphism in a species with alternative behavioural strategies

Space use including territoriality and spatial arrangement within a population can reveal important information on the nature, dynamics and evolutionary maintenance of alternative strategies in colour polymorphic species. Despite the prevalence of colour polymorphic species as model systems in evolutionary biology, the interaction between space-use and genetic structuring of morphs within populations has rarely been examined. Here we assess the spatial and genetic structure of male throat colour morphs within a population of the tawny dragon lizard, Ctenophorus decresii. Male colour morphs do not differ in morphology but differ in aggressive and anti-predator behaviours as well as androgen levels. Despite these behavioural and endocrine differences, we find that colour morphs do not differ in territory size, with their spatial arrangement being essentially random with respect to each other. There were no differences in genetic diversity or relatedness between morphs; however, there was ...种群内的空间利用（space use）模式，涵盖领域性（territoriality）与空间排布（spatial arrangement），能够揭示色彩多态物种（colour polymorphic species）中替代性生存策略的本质、动态变化与演化维持机制。尽管色彩多态物种作为演化生物学研究的模式系统（model systems）十分普遍，但种群内各色彩形态的空间利用模式与遗传结构（genetic structuring）之间的相互作用却极少得到关注。本研究针对褐龙蜥（tawny dragon lizard, Ctenophorus decresii）种群内的雄性喉部色彩形态的空间结构与遗传结构展开分析。不同雄性色彩形态个体在躯体形态上并无差异，但在攻击行为、反捕食行为以及雄激素（androgen）水平上存在显著区别。尽管存在上述行为与内分泌层面的差异，本研究发现不同色彩形态个体的领域面积（territory size）并无显著差异，且彼此间的空间排布基本呈随机分布状态。不同色彩形态个体的遗传多样性（genetic diversity）与亲缘关系（relatedness）均无显著差异；然而，……