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首页> 外文期刊>Australian Journal of Botany >Limited impact of fragmentation and disturbance on the mating system of tuart (Eucalyptus gomphocephala, Myrtaceae): implications for seed-source quality in ecological restoration.
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Limited impact of fragmentation and disturbance on the mating system of tuart (Eucalyptus gomphocephala, Myrtaceae): implications for seed-source quality in ecological restoration.

机译：破碎和扰动对绢art（桉树，桃金娘科）的交配系统的影响有限：对生态修复中种子源质量的影响。

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摘要

Variation in patterns of mating within and among plant populations can be impacted by habitat disturbance and have significant implications for offspring fitness. An understanding of this variation will inform predictions of seed genetic quality, benefiting ecological restoration through better seed-sourcing guidelines. We assessed mating system variation in six populations of tuart (Eucalyptus gomphocephala DC.), an iconic tree of significance to ecological restoration in Western Australia. A mixed mating system was observed with predominant outcrossing (tm=0.76+or-0.05) and low biparental inbreeding (tm-ts=0.03+or-0.02). We detected some evidence of increased inbreeding in a naturally fragmented population (tm-ts=0.10+or-0.04) and in a disturbed urban remnant (tm=0.52+or-0.12), including a family with complete selfing. However, most variation in outcrossing rate occurred among individuals within populations (82%), rather than among populations (2.6%) or among groups of populations defined by fragmentation or disturbance (15.4%). Genetic diversity was not consistently lower in offspring from fragmented, smaller and/or disturbed populations. These data reinforce the importance of sourcing seeds from multiple trees for ecological restoration, and emphasise that tuart's mating system and the genetic diversity of offspring is robust to some habitat disturbance and/or fragmentation.
机译：植物种群内部和种群之间交配模式的变化可能会受到栖息地干扰的影响，并对后代的适应能力产生重大影响。对这种变异的了解将有助于对种子遗传质量的预测，并通过更好的种子采购指南有益于生态恢复。我们评估了图阿特（Eucalyptus gomphocephala DC。）的六个种群的交配系统变异，该种群对西澳大利亚州的生态恢复具有重要意义。观察到混合交配系统，主要是异种交配（t m = 0.76 + or-0.05）和低双亲近交（t m -t s ） = 0.03 +或-0.02）。我们发现在自然零散的种群（t m -t s = 0.10 + or-0.04）和受干扰的城市残余物（t m = 0.52 +或-0.12），包括一个完全自交的家庭。但是，异种交配率的大多数变化发生在人群中的个体中（82％），而不是群体中的个体（2.6％）或由分裂或干扰所定义的群体中的群体（15.4％）。零散，较小和/或受干扰的种群的后代的遗传多样性并非一直较低。这些数据强调了从多棵树上采购种子以恢复生态的重要性，并强调了图阿特的交配系统和后代的遗传多样性对某些栖息地的干扰和/或破碎具有强大的作用。

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