Arms race between weevil rostrum length and camellia pericarp thickness: Geographical cline and theory
Arms race between weevil rostrum length and camellia pericarp thickness: Geographical cline and theory
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DOI：
10.1016/j.jtbi.2011.05.033
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发表时间：
2011-09-21
影响因子：
2
通讯作者：
Toju, Hirokazu
中科院分区：
文献类型：
--
作者：
Iseki, Naoyuki;Sasaki, Akira;Toju, Hirokazu
象鼻虫喙（口器）长度和山茶果皮（果皮）厚度的共同进化性状的地理渐变提供了一个机会，以测试军备竞赛理论的防御（果皮厚度）和对策（喙长）之间的拮抗相互作用的物种。通过扩展先前的数量性状的协同进化模型，引入夸大性状的非线性成本，世代重叠和宿主中的密度依赖性调节，我们研究了进化稳定（ES）在日本山茶（山茶）果皮厚度和ES喙长度在山茶象甲（山茶）。联合单态ES系统具有非线性成本的鲁棒结果，我们分析了两个物种在进化平衡时的特征如何依赖于人口统计参数。如果山茶种群参数在纬度上变化，则在地理尺度上采集的喙长和果皮厚度数据应位于一条斜率小于钻孔成功等概率线A/B的近似线性曲线上，其中A和B分别是钻孔成功与果皮厚度和喙长的Logistic回归系数。这是一个鲁棒的预测，只要成本的rostrum长度是非线性的（加速）。因此，在具有较长喙长度的群体中，钻孔成功率应该较低，如在象鼻虫-山茶属系统中所报道的（Toju，H.，和Sota，T.，2006年a。捕食者和猎物武器的不平衡：表型界面和自然选择中的地理倾向。American Naturalist 167，105 - 117）.的非线性（指数）的成本的喙长度估计从地理梯度数据的weevil-camellia系统是2.2，这表明二次和三次形式之间的非线性。(C)2011爱思唯尔有限公司版权所有。
The geographical cline of the coevolving traits of weevil rostrum (mouthpart) length and camellia pericarp (fruit coat) thickness provides an opportunity to test the arms race theory of defense (pericarp thickness) and countermeasure (rostrum length) between antagonistically interacting species. By extending the previous model for the coevolution of quantitative traits to introduce nonlinear costs for exaggerated traits, the generation overlap, and density-dependent regulation in the host, we studied the evolutionarily stable (ES) pericarp thickness in the Japanese camellia (Camellia japonica) and the ES rostrum length in the camellia-weevil (Curculio camelliae). The joint monomorphic ES system has a robust outcome with nonlinear costs, and we analyzed how the traits of both species at evolutionary equilibrium depend on demographic parameters. If camellia demographic parameters vary latitudinally, data collected over the geographical scale of rostrum length and pericarp thickness should lie on an approximately linear curve with the slope less than that of the equiprobability line A/B of boring success, where A and B are coefficients for the logistic regression of boring success to pericarp thickness and rostrum length, respectively. This is a robust prediction as long as the cost of rostrum length is nonlinear (accelerating). As a result, boring success should be lower in populations with longer rostrum length, as reported in the weevil-camellia system (Toju, H., and Sota, T., 2006a. Imbalance of predator and prey armament: Geographic clines in phenotypic interface and natural selection. American Naturalist 167, 105-117). The nonlinearity (exponent) for the cost of rostrum length estimated from the geographical cline data for the weevil-camellia system was 2.2, suggesting nonlinearity between quadratic and cubic forms. (C) 2011 Elsevier Ltd. All rights reserved.