The effect of ecological factors on the mating system of a South American shrub species (Helicteres brevispira)
The effect of ecological factors on the mating system of a South American shrub species (Helicteres brevispira)
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DOI：
10.1046/j.1365-2540.2000.00636.x
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发表时间：
2000-01-01
期刊：
影响因子：
3.8
通讯作者：
Bawa, KS
中科院分区：
文献类型：
--
作者：
Franceschinelli, EV;Bawa, KS
交配系统受到几个生态因素的影响，包括植物密度，每株植物的花数和传粉者的运动。在这项研究中，我们调查了这三个因素对交配系统的自交亲和的巴西灌木物种：山芝麻短螺旋圣希尔的同时影响。异交率与密度直接相关。单株花数的变化通过影响花的密度来影响异交率。蜂鸟传粉者觅食行为的变化是植物密度和每株花数之间相互作用的结果。领地传粉者在高密度地区很常见，但每株植物上的花很少，从而促进了异交。在植物密度较低的地区，诱捕者和稀有领地主义者访问每株植物的几朵花，从而增加自交。我们的研究结果表明，异交率是一个动态参数，与变化的程度取决于一些生态因素。在演替的物种，如属山芝麻，人口的变化可能伴随着交配系统参数的改变，伴随着对种群遗传结构的影响。
Mating systems are influenced by several ecological factors, including plant density, number of flowers per plant, and pollinator movements. In this study, we investigated the simultaneous effects of these three factors on the mating system of a self-compatible Brazilian shrub species: Helicteres brevispira St. Hil. Outcrossing rate is directly correlated with plant density. Changes in the number of flowers per plant affect outcrossing rate through their effect on the density of flowers. Variation in foraging behaviour of hummingbird pollinators is a consequence of the interaction between plant density and number of flowers per plant. Territorialist pollinators are common in high density areas but visit few flowers on each plant, thereby promoting outcrossing. In areas of low plant density, trapliners and rare territorialists visit several flowers per plant, thus increasing selfing. Our results indicate that outcrossing rate is a dynamic parameter, with the extent of variation depending on a number of ecological factors. In successional species such as those in the genus Helicteres, demographic changes may be accompanied by alterations in mating system parameters, with concomitant effects on the genetic structure of populations.