Gondwanan conifer clones imperilled by bushfire.
Gondwanan conifer clones imperilled by bushfire.
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DOI：
10.1038/srep33930
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发表时间：
2016-09-26
影响因子：
4.6
通讯作者：
Bowman DM
中科院分区：
文献类型：
--
作者：
Worth JR;Sakaguchi S;Rann KD;Bowman CJ;Ito M;Jordan GJ;Bowman DM
人为温室气体排放和土地利用变化导致的全球火灾频率增加，可能会威胁到独特和古老的物种，使它们成为长期的火灾避难所。塔斯马尼亚的过湿润和多山的西半部是全球重要的古地方性，不耐火谱系的避难所，特别是针叶树。繁殖策略对于这些生物在更温暖、更干燥和更容易发生火灾的气候下的恢复能力至关重要。本研究分析了以古特有针叶树Athrotaxis cupressoides（柏科）为主的旧生长地块的克隆与有性繁殖，该物种缺乏任何耐受频繁景观火灾的特征。在大多数样地中，性衍生个体的数量低于无性衍生个体的数量，平均60%的茎属于相同的多位点谱系（MLL）（即无性衍生）。一些mll跨度超过10米，由多达62根茎组成。火灾后的高死亡率和性再生的罕见性意味着这种不耐火物种的范围可能在增强的火灾制度下缩小，并且通过种子传播到景观中可用的火灾避难所的能力有限。
Global increases in fire frequency driven by anthropogenic greenhouse emissions and land use change could threaten unique and ancient species by creeping into long-term fire refugia. The perhumid and mountainous western half of Tasmania is a globally important refugium for palaeo-endemic, fire intolerant lineages, especially conifers. Reproductive strategy will be crucial to the resilience of these organisms under warmer, dryer and more fire prone climates. This study analysed clonal versus sexual reproduction in old growth plots dominated by the palaeo-endemic conifer Athrotaxis cupressoides (Cupressaceae), a species that lacks any traits to tolerate frequent landscape fire. Across most of the seven plots the amount of sexually derived individuals was lower than clonally derived with, on average, 60% of all stems belonging to the same multi-locus lineage (MLL) (i.e. were clonal). Some MLLs were large spanning over 10 s of metres and consisted of up to 62 stems. The high mortality after fire and the rarity of sexual regeneration means that the range of this fire-intolerant species is likely to contract under enhanced fire regimes and has a limited capacity to disperse via seed to available fire refugia in the landscape.
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影响因子：
1.1
作者：
Kirkpatrick, J. B.;Bridle, K. L.;Dickinson, K. J. M.
通讯作者：
Dickinson, K. J. M.
影响因子：
10.3
作者：
Enright, Neal J.;Fontaine, Joseph B.;Williams, Richard J.
通讯作者：
Williams, Richard J.
影响因子：
1.1
作者：
CULLEN, PJ;KIRKPATRICK, JB
通讯作者：
KIRKPATRICK, JB
影响因子：
8.8
作者：
van Mantgem, Phillip J.;Nesmith, Jonathan C. B.;Flint, Lorriane
通讯作者：
Flint, Lorriane
影响因子：
3.7
作者：
Allen, Craig D.;Macalady, Alison K.;Cobb, Neil
通讯作者：
Cobb, Neil