Adaptive divergence of scaling relationships mediates the arms race between a weevil and its host plant
Adaptive divergence of scaling relationships mediates the arms race between a weevil and its host plant
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DOI：
10.1098/rsbl.2006.0514
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发表时间：
2006-12
期刊：
影响因子：
3.3
通讯作者：
Hirokazu Toju;T. Sota
中科院分区：
文献类型：
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作者：
Hirokazu Toju;T. Sota
昆虫和植物之间夸张形态的共同进化是进化生物学中一个众所周知但知之甚少的现象。在种子掠食性昆虫茶花象鼻虫（Curculio camelliae）与其寄主植物日本茶花（camellia japonica）的拮抗相互作用中，从尺度关系的角度考察了象鼻虫一个夸张的攻击性状（讲台长度）的进化轨迹。在整个日本的采样显示，喙长与整体体型的比例与果皮厚度与整个果实大小的比例相关。在异速生长方程的一个参数（y=axb中的系数a，其中y和x分别代表茎台和体长）上发现了种群间的地理分化，且异速生长系数的地理分化格局与日本茶树果皮厚度的变化密切相关。我们的研究结果提供了一个新的例子，在昆虫形态中，地理上分散的尺度关系是由与宿主植物的共同进化军备竞赛引起的。
Coevolution of exaggerated morphologies between insects and plants is a well-known but poorly understood phenomenon in evolutionary biology. In the antagonistic interaction between a seed-predatory insect, the camellia weevil (Curculio camelliae), and its host plant, Japanese camellia (Camellia japonica), we examined the evolutionary trajectory of an exaggerated offensive trait of the weevil (rostrum length) in terms of scaling relationship. Sampling throughout Japan revealed that the ratio of the rostrum length to overall body size was correlated with the ratio of the pericarp thickness to overall fruit size across the localities. We found a geographical interpopulation divergence in a parameter pertaining to the allometric equation of rostrum length (the coefficient a in y=axb, where y and x denote rostrum and body lengths, respectively), and the pattern of geographical differentiation in the allometric coefficient was closely correlated with the variation in the pericarp thickness of Japanese camellia. Our results provide a novel example of a geographically diverged scaling relationship in an insect morphology resulting from a coevolutionary arms race with its host plant.