Department of Biology and Graduate Program in Evolution, Ecology and Organismal Biology, University of California, Riverside, CA, USA.
J Evol Biol. 2011 Feb;24(2):256-64. doi: 10.1111/j.1420-9101.2010.02160.x. Epub 2010 Nov 2.
Many models of life history evolution assume trade-offs between major life history traits; however, these trade-offs are often not found. The Y model predicts that variation in acquisition can mask underlying allocation trade-offs and is a major hypothesis explaining why negative relationships are not always found between traits that are predicted to trade-off with one another. Despite this model's influence on the field of life history evolution, it has rarely been properly tested. We use a model system, the wing dimorphic cricket, Gryllus firmus as a case study to test the assumptions and predictions of the Y model. By experimentally altering the acquisition regime and by estimating energy acquisition and energy allocation directly in this species, we are able to explicitly test this important model. Overall, we find strong support for the predictions of the Y model.
许多生命史进化模型假设主要生命史特征之间存在权衡关系；然而，这些权衡关系并不总是存在。Y 模型预测，获取的变化可以掩盖潜在的分配权衡关系，这是一个主要的假设，解释了为什么在那些被预测相互权衡的特征之间，并不总是存在负相关关系。尽管该模型对生命史进化领域产生了影响，但它很少得到适当的检验。我们使用一个模型系统，即翅型二态蟋蟀 Gryllus firmus，作为案例研究来检验 Y 模型的假设和预测。通过实验改变获取模式，并直接在该物种中估计能量获取和能量分配，我们能够明确地检验这个重要的模型。总的来说，我们强烈支持 Y 模型的预测。
