Price Mary V, Waser Nickolas M
Department of Biology, University of California, 92521, Riverside, CA, USA.
Rocky Mountain Biological Laboratory, 81224, Crested Butte, CO, USA.
Oecologia. 1982 Sep;54(3):353-358. doi: 10.1007/BF00380004.
We present results of experiments designed to identify floral characteristics that influence patterns of pollen carryover by hummingbirds visiting Ipomopsis aggregata flowers. We used fluorescent dye powders as pollen analogues. For all four experimental treatments considered, amounts of dye deposited on recipient stigmas declined linearly as a function of flower position in a visitation sequence. The decline was significantly steeper when recipient flowers had pollen-carrying anthers than when they did not; whereas degree of stigma clogging and presence or absence of empty anthers did not influence carryover. From this we conclude that presence of pollen on recipient flowers significantly reduces the average number of subsequent flowers reached by donor pollen. We discuss mechanisms for this effect and its significance for the evolution of floral structure.
我们展示了旨在识别影响访问聚花蛾蝶花的蜂鸟携带花粉模式的花部特征的实验结果。我们使用荧光染料粉末作为花粉类似物。对于所考虑的所有四种实验处理，沉积在接受者柱头上的染料量随着访问序列中花的位置呈线性下降。当接受者花朵有携带花粉的花药时，下降幅度明显比没有时更陡；而柱头堵塞程度以及空花药的有无并不影响花粉携带。由此我们得出结论，接受者花朵上的花粉显著减少了供体花粉到达后续花朵的平均数量。我们讨论了这种效应的机制及其对花部结构进化的意义。
