Temporal and spatial mating-system variation in fragmented populations of Banksia cuneata, a rare bird-pollinated long-lived plant
Temporal and spatial mating-system variation in fragmented populations of Banksia cuneata, a rare bird-pollinated long-lived plant
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DOI：
10.1071/bt12244
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发表时间：
2013-01-01
影响因子：
1.1
通讯作者：
Madden, Sally
中科院分区：
文献类型：
--
作者：
Coates, David J.;Williams, Matthew R.;Madden, Sally
植物交配系统在空间和时间上都有很大差异，影响着一系列对植物种群持续存在至关重要的人口统计和遗传过程。研究人员对 Banksia cuneata (A. S. George) 的交配系统的时空变化进行了研究，这是一种罕见的鸟类授粉灌木，生长在高度破碎的景观中。人们观察到交配系统存在巨大的变化，一个种群内的时间变化幅度往往与一个季节内种群之间的空间变化水平一样高。在受干扰的种群中观察到异交率显着降低，异交率和相关亲子关系的时间变化增加。在增加受干扰的种群后，发现了父系邻域的加倍和异交率增加的趋势，其中种群规模从 57 株成年植物增加到 214 株。与成虫相比，在所有种群中都观察到种子的固定指数大幅增加，差异的大小显示出时间和空间的一致性。我们建议，不仅在评估栖息地破碎化对植物种群的影响时，而且在设计和建立成功的易位、扩大和恢复计划时，需要更多地考虑交配系统的时间变化。
Plant mating systems can vary significantly in both space and time, influencing a range of demographic and genetic processes critical for the persistence of plant populations. Spatial and temporal mating-system variations were investigated in Banksia cuneata (A. S. George), a rare bird-pollinated shrub occurring in a highly fragmented landscape. Substantial variation in the mating system was observed, with the magnitude of temporal variation within a population often as high as the level of spatial variation among populations within a season. A significant reduction in outcrossing rates and increased temporal variation in both outcrossing rates and correlated paternity were observed in disturbed populations. Doubling of the paternal neighbourhood and a trend to increased outcrossing rate was found after augmentation of a disturbed population where population size was increased from 57 to 214 adult plants. A large increase in the fixation index for seeds compared with adults was observed in all populations, with the magnitude of the difference showing temporal and spatial uniformity. We suggest that temporal mating-system variation warrants increased consideration, not only in assessing the effects of habitat fragmentation on plant populations, but also in the design and establishment of successful translocation, augmentation and restoration programs.