Asynchrony in individual and subpopulation fecundity stabilizes reproductive output of an alpine plant population
Asynchrony in individual and subpopulation fecundity stabilizes reproductive output of an alpine plant population
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个体和亚群繁殖力的异步稳定了高山植物种群的繁殖产出
DOI：
10.1002/ecy.2639
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发表时间：
2019
期刊：
影响因子：
4.8
通讯作者：
Doak, Daniel F.
中科院分区：
文献类型：
--
作者：
Waddle, Ellen;Piedrahita, Lucas R.;Hall, Elijah S.;Kendziorski, Grace;Morris, William F.;Peterson, Megan L.;Doak, Daniel F.
整个种群的结果，如丰度、生殖产出或平均存活率，可以通过个体或亚种群表现的非同步变化来稳定。这种“组合效应”越来越多地被记录在亚种群的规模上，并被认为在面对环境变化时在产生种群现象的稳定性方面发挥了重要作用。然而，很少有研究在更精细的个人规模上量化投资组合效应的强度和来源。我们使用高山植物16年的果实产量和气候数据来剖析繁殖中组合效应的规模，以及个体性状(包括大小和开花时间)在推动生殖产量中的贡献。繁殖成功的异步性大大减少了种群水平生殖产出的差异，其中约四分之一的稳定效应来自个体差异，主要不是那些以测量的性状为特征的差异，约四分之三来自亚种群之间的异步性。这些结果强调了投资组合效应的不同尺度和原因。我们提供的对投资组合效应的分解可以促进对其他系统中这些效应的强度和原因进行类似的细分。
Population‐wide outcomes such as abundance, reproductive output, or mean survival can be stabilized by non‐synchronous variation in the performance of individuals or subpopulations. Such “portfolio effects” have been increasingly documented at the scale of subpopulations and are thought to play an important role in generating stability of population phenomena in the face of environmental variation. However, few studies quantify the strength and origin of portfolio effects at the finer scale of individuals. We used 16 yr of fruit production and climate data for an alpine plant to dissect the scale of portfolio effects in reproduction, as well as the contribution of individual traits including size and flowering time in driving reproductive output. Asynchrony in reproductive success substantially reduces variation in population‐level reproductive output, with approximately one‐fourth of this stabilizing effect arising from individual differences, mostly not those characterized by measured traits, and approximately three‐fourths from asynchrony across subpopulations. These results emphasize the different scales and causes of portfolio effects. The decomposition for portfolio effects we provide can facilitate similar breakdowns of the strength and causes of these effects in other systems.