Ashman Tia-Lynn, Galloway Laura F, Stanton Maureen L
Botany Department, University of California, 95616, Davis, CA, USA.
Oecologia. 1993 Oct;96(1):102-107. doi: 10.1007/BF00318036.
Effective mating in plant populations need not occur during periods of peak pollinator activity and flowering. We measured seasonal and diurnal patterns of pollinator activity, pollen and ovule availability, and seed production in an experimental population of Raphanus sativus to infer the times of reproductively effective mating. On a seasonal scale, we found that most "effective matings", those resulting in mature seeds, occurred very early in the season, well before the peak of flowering and pollinator activity. At a finer scale, diurnal schedules of flower opening, stigma saturation with pollen, and pollen removal indicated that most effective matings occurred before noon, even though pollinator activity increased later in the day. These patterns may be most common in populations that are not pollen limited, but other ecological factors (e.g. seed predation, resource depletion) could weaken the correspondence between pollination and effective mating.
植物种群中的有效交配并不一定发生在传粉者活动和开花的高峰期。我们测量了萝卜实验种群中传粉者活动、花粉和胚珠可用性以及种子产量的季节和昼夜模式，以推断生殖有效交配的时间。在季节尺度上，我们发现大多数导致成熟种子的“有效交配”发生在季节早期，远早于开花和传粉者活动的高峰期。在更精细的尺度上，花朵开放、柱头花粉饱和以及花粉去除的昼夜时间表表明，即使传粉者活动在当天晚些时候增加，大多数有效交配仍发生在中午之前。这些模式在不受花粉限制的种群中可能最为常见，但其他生态因素（如种子捕食、资源枯竭）可能会削弱授粉与有效交配之间的对应关系。
