Seed supply for broadscale restoration: maximizing evolutionary potential.

Seed supply for broadscale restoration: maximizing evolutionary potential.
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DOI:
10.1111/j.1752-4571.2008.00045.x
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发表时间:
2008-11
影响因子:
4.1
通讯作者:
Yates C
Yates C
中科院分区:
生物学2区
文献类型:
--
作者:
Broadhurst LM;Lowe A;Coates DJ;Cunningham SA;McDonald M;Vesk PA;Yates C

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恢复退化的土地以对抗环境退化需要收集大量的种质(种子)。这种材料的来源提出了与种源选择、种子质量和收获可持续性相关的问题。恢复指南强烈建议使用当地来源来最大限度地适应当地情况,防止异地繁殖衰退,但在高度修改的景观中,这将收集限制在可获得有限、质量差的种子的小残留物,以及收获影响可能很大的地方。我们回顾了指导恢复种质来源的三个原则:(I)使用‘本地’种子的适当性,(Ii)获取足够的遗传多样性以建立自给自足的种群所需的样本大小和种群特征,以及(Iii)过度捕捞源种群的影响。我们通过检查当前的收集指南和支持这些指南的证据来审查这些主题,然后我们考虑是否可以改进指南以及不这样做的后果。我们发现,在许多情况下,对当地种子来源的重视将导致较差的恢复结果,特别是在广泛的地理范围内。我们建议,种子采购应少集中于当地收集,而应更多地集中于捕获高质量和遗传多样性的种子,以最大限度地发挥恢复工作对当前和未来环境变化的适应潜力。
Restoring degraded land to combat environmental degradation requires the collection of vast quantities of germplasm (seed). Sourcing this material raises questions related to provenance selection, seed quality and harvest sustainability. Restoration guidelines strongly recommend using local sources to maximize local adaptation and prevent outbreeding depression, but in highly modified landscapes this restricts collection to small remnants where limited, poor quality seed is available, and where harvesting impacts may be high. We review three principles guiding the sourcing of restoration germplasm: (i) the appropriateness of using ‘local’ seed, (ii) sample sizes and population characteristics required to capture sufficient genetic diversity to establish self-sustaining populations and (iii) the impact of over-harvesting source populations. We review these topics by examining current collection guidelines and the evidence supporting these, then we consider if the guidelines can be improved and the consequences of not doing so. We find that the emphasis on local seed sourcing will, in many cases, lead to poor restoration outcomes, particularly at broad geographic scales. We suggest that seed sourcing should concentrate less on local collection and more on capturing high quality and genetically diverse seed to maximize the adaptive potential of restoration efforts to current and future environmental change.
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