Am Nat. 2022 Jun;199(6):824-840. doi: 10.1086/715501. Epub 2022 Apr 20.
AbstractA current frontier of character displacement research is to determine whether displacement occurs via multiple phenotypic pathways and varies across communities with different species compositions. Here, we conducted the first test for context-dependent character displacement in multimodal floral signals by analyzing variation in floral scent in a system that exhibits character displacement in flower size and that has multiple types of sympatric communities. In a greenhouse common garden experiment, we measured quantitative variation in volatile emission rates of the progeny of two species of from replicated parental communities that contain one, two, or four species. The first two axes of a constrained correspondence analysis, which explained 24% of the total variation in floral scent, separated the species and community types. Of the 23 compounds that were significantly correlated with these axes, nine showed patterns consistent with character displacement. Two compounds produced primarily by and two compounds produced primarily by were emitted in higher amounts in sympatry. Character displacement in some volatiles varied across sympatric parental communities and occurred in parallel with displacement in flower size, demonstrating that this evolutionary process can be context dependent and may occur through multiple pathways.
摘要 目前，特征转移研究的一个前沿领域是确定是否通过多种表型途径发生转移，以及在具有不同物种组成的群落中是否存在差异。在这里，我们通过分析在一个表现出花大小特征转移且具有多种同域群落的系统中花香的变化，首次对多模态花信号中的情境依赖特征转移进行了测试。在温室同种园实验中，我们测量了来自包含一个、两个或四个物种的重复亲社区的两个物种后代的挥发性排放率的定量变化。约束对应分析的前两个轴解释了花香总变异的 24%，这些轴分离了物种和群落类型。在与这些轴显著相关的 23 种化合物中，有 9 种表现出与特征转移一致的模式。两种主要由产生的化合物和两种主要由 产生的化合物在同域中释放的量更高。一些挥发性物质的特征转移在同域亲社区中存在差异，并且与花大小的转移平行发生，这表明这个进化过程可能是情境依赖的，并且可能通过多种途径发生。
