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Detecting canalization and intra-floral modularity in triggerplant (Stylidium) flowers: correlations are only part of the story

机译:检测触发植物(Stylidium)花中的渠化和花内模块性:相关性只是故事的一部分

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摘要

The Berg hypothesis proposes that specialized-flower traits experience stronger stabilizing selection than non-floral structures and predicts that variation in specialized-flower traits will be mostly uncorrelated with variation in non-floral traits. Similarly, adaptive-accuracy theory predicts lower variation (as a proportion of the mean) in floral traits than in non-floral ones. Both hypotheses can be extended to comparisons between floral traits, where different parts of the flower can be expected to experience different strengths of stabilizing selection, resulting in contrasting patterns of variation. The present study tests these ideas by analysing variation/covariation in those floral traits influencing the location of pollen placement on, and stigma contact with, pollinators (‘pollination-mechanics traits’, PMTs) in relation to variation/covariation in non-floral traits and floral traits not directly involved in the mechanics of pollination. The prediction was that PMTs are canalized (buffered against genetic and environmental variation) relative to attraction traits, as manifested in lower variances and modular independence.
机译:Berg假说提出,特殊花性状比非花卉结构具有更强的稳定选择能力,并预测特殊花性状的变异与非花卉性状的变异大多无关。同样,自适应精度理论预测花卉特征比非花卉特征具有更低的变异(作为平均值的一部分)。两种假设都可以扩展到花性状之间的比较,在花状性状中,可以预期花的不同部分经历不同的稳定选择强度,从而导致变化的对比模式。本研究通过分析影响非授粉性状变异/协变的授粉媒介上花粉放置和柱头接触的花性状的变异/协变来测试这些想法(“授粉-机械性状”,PMT)。以及不直接参与授粉机制的花卉性状。预测是,相对于吸引性状,PMTs被运河化了(缓冲了遗传和环境变化),表现为较低的方差和模块独立性。

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