Evolutionary history, not ecogeographic rules, explains size variation of tropical insects along elevational gradients
Evolutionary history, not ecogeographic rules, explains size variation of tropical insects along elevational gradients
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DOI：
10.1111/1365-2435.13666
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发表时间：
2020-09-23
影响因子：
5.2
通讯作者：
Sarathy, Vikas
中科院分区：
文献类型：
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作者：
Garcia-Robledo, Carlos;Baer, Christina S.;Sarathy, Vikas
变温动物最著名的生物地理规则之一是温度-尺寸规则，该规则断言变温动物在较温暖的温度下产生较小的成年动物。虽然这通常是正确的，但很明显，在模式背后没有单一的过程，并且规则有许多例外。为了解开这种复杂的温度-尺寸关系，必须在生态和进化的尺度上研究单个进化枝。本文研究了发生在中美洲哥斯达黎加的Barva和Talamanca科迪勒拉两个热带海拔梯度上的头叶卷叶甲虫64个种群和40种2106个个体的温度-尺寸关系。我们测试了温度-尺寸规则是否适用于种间海拔组合，种内海拔群体或不同饲养温度的个体群体。在种间尺度上，解释体型的是进化史，而不是海拔高度。在种内尺度上，七个物种中只有一个遵循温度-尺寸跨越海拔的规则。当幼虫在不同的温度下饲养时，只有五分之一的种群遵循温度大小规则。无论温度如何，大多数种群都能长到固定的大小。小头甲虫的大小受其进化史的限制，并对很少与温度相关的因素作出反应。随着温度的升高，变温动物不会普遍缩小，但确定它们的大小是否会改变以及为什么会改变还需要进一步的研究。在本文的支持信息中可以找到一个免费的简单语言摘要。
One of the best-known biogeographic rules for ectotherms is the temperature-size rule, which asserts that ectotherms produce smaller adults at warmer temperatures. Although this is often true, it has become clear that there is no single process behind the pattern and many exceptions to the rule. To disentangle such complex temperature-size relationships, individual clades must be examined at ecological and evolutionary scales. We examined temperature-size relationships for 2,106 individuals from 64 populations and 40 species ofCephaloleiarolled-leaf beetles (Chrysomelidae; Cassidinae) occurring along two tropical elevational gradients: Barva and the Talamanca Cordillera in Costa Rica, Central America. We tested whether the temperature-size rule applied to interspecific elevational assemblages, intraspecific elevational populations or different rearing temperatures for individual populations. At the interspecific scale, evolutionary history, rather than elevation, explains body size. At the intraspecific scale, only one of seven species followed the temperature-size rule across elevations. When larvae were reared at different temperatures, only one of five populations followed the temperature-size rule. Most populations grew to a fixed size regardless of temperature. Size inCephaloleiabeetles is constrained by their evolutionary history and responds to factors that rarely correlate with temperature. As temperature increases, ectotherms will not universally shrink, but determining if and why their size will change will require further investigation. A freePlain Language Summarycan be found within the Supporting Information of this article.