Condition dependence of male display coloration in a jumping spider (Habronattus pyrrithrix)
Condition dependence of male display coloration in a jumping spider (Habronattus pyrrithrix)
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DOI：
10.1007/s00265-010-1127-5
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发表时间：
2011-05
影响因子：
2.3
通讯作者：
L. Taylor;D. L. Clark;K. McGraw
中科院分区：
文献类型：
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作者：
L. Taylor;D. L. Clark;K. McGraw
在许多动物中，明显的颜色是一种质量信号。指示器模型预测，这种颜色应该是可变的和条件相关的。在Habronattus pyrithrixjumping spider中，雌性的颜色不明显，而雄性在求偶时会显示出鲜艳的红色面孔，绿色腿和白色须。我们在一项实地研究中测试了指标模型的预测，发现男性身体状况与男性面部斑块的大小、色调和红色色度呈正相关，与他的绿色腿的亮度呈负相关。这些特征比非显示颜色更依赖于条件。然后，我们使用两个实验测试了条件依赖的饮食机制。为了了解幼年饮食如何影响着色的发展，我们饲养了高质量和低质量的饮食和测量着色成熟的幼年蜘蛛。为了了解成虫的饮食如何影响颜色的维持，我们用高质量或低质量的饮食喂养野生捕获的成虫，并在45天后比较它们的颜色。在第一个实验中，喂食高质量饮食的雄性有更红的脸，这表明条件依赖是由幼年饮食介导的。在第二个实验中，红色着色没有不同的治疗，这表明成人饮食是不重要的，以保持颜色后，它是在成熟。在两项实验中，饮食对绿色着色没有影响。我们的结果表明男性展示颜色具有不同程度的条件依赖性。因为红色依赖于幼年的饮食，它可能是健康或觅食能力的信号。我们讨论的证据表明，绿色着色是年龄依赖性和替代指标模型的丰富多彩的显示跳蜘蛛。
In many animals, conspicuous coloration functions as a quality signal. Indicator models predict that such colors should be variable and condition dependent. InHabronattus pyrrithrixjumping spiders, females are inconspicuously colored, while males display brilliant red faces, green legs, and white pedipalps during courtship. We tested the predictions of the indicator model in a field study and found that male body condition was positively correlated with the size, hue, and red chroma of a male’s facial patch and negatively correlated with the brightness of his green legs. These traits were more condition dependent than non-display colors. We then tested a dietary mechanism for condition dependence using two experiments. To understand how juvenile diet affects the development of coloration, we reared juvenile spiders on high- and low-quality diets and measured coloration at maturity. To understand how adult diet affects the maintenance of coloration, we fed wild-caught adults with high- or low-quality diets and compared their coloration after 45 days. In the first experiment, males fed high-quality diet had redder faces, suggesting that condition dependence is mediated by juvenile diet. In the second experiment, red coloration did not differ between treatments, suggesting that adult diet is not important for maintaining the color after it is produced at maturity. Diet had no effect on green coloration in either experiment. Our results show different degrees of condition dependence for male display colors. Because red is dependent on juvenile diet, it may signal health or foraging ability. We discuss evidence that green coloration is age dependent and alternatives to indicator models for colorful displays in jumping spiders.