Pair-wise analyses of the effects of demographic processes, vital rates, and life stages on the spatiotemporal variation in the population dynamics of the riparian tree Aesculus turbinata Blume
Pair-wise analyses of the effects of demographic processes, vital rates, and life stages on the spatiotemporal variation in the population dynamics of the riparian tree Aesculus turbinata Blume
复制标题
人口统计过程、生命率和生命阶段对河岸树七叶树种群动态时空变化影响的成对分析
DOI：
10.1007/s10144-013-0399-9
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发表时间：
2014
影响因子：
1.7
通讯作者：
Kaneko T and Takada T
中科院分区：
文献类型：
--
作者：
Rio Yamanaka;Kaoru Nakamura;Akio Murakami;Kaneko T and Takada T
滨岸树的种群增长率（λ）在0.9988 ~ 1.0524之间变化。我们进行了一系列成对人口统计学和矩阵分析，包括随机化检验、三种类型的生命表反应实验（LTREs）、方差分析和χ2检验，以检验哪些生命阶段对λ的变异影响最大。随机化试验发现，在3个生境受台风影响和不受台风影响的地块之间，以及在一个生境的增收高峰和低谷之间，λ值存在显著差异。混合水平LTREs发现，对λ的实际变化影响最大的人口统计学过程和生命阶段是：(1)中小幼体的发育过程和(2)从种子到1年树龄幼苗的形成过程。这些幼年阶段具有中等的敏感性和方差，解释了高水平的LTRE贡献。较低水平的LTREs表明，对这些幼鱼阶段的生长速率贡献最大的是生命速率。这些发现表明，从一个阶段到下一个阶段的进展，1年树苗的生长率和发育迟缓的衰老幼树是这种长寿的主要树种种群动态的最重要阶段。具有高弹性的过渡矩阵元素对λ的变化几乎没有影响，这表明高弹性的生命率不一定会驱动人口增长的变化。与随机化检验的结果相比，方差分析和χ2检验的显著差异表明，台风干扰对单株树木的人口学参数影响最大。
Population growth rates (λ) of the riparian treeAesculus turbinatavaried from 0.9988 to 1.0524 spatiotemporally. We conducted a series of pair-wise demographic and matrix analyses, including randomization tests, three types of life table response experiments (LTREs), analysis of variance and χ2tests, to test which life stages had the greatest effect on this variation inλ. Randomization tests detected significant variations inλbetween plots affected or not by typhoons in three habitats and between periods with high and low recruitment in one habitat. Mixed-level LTREs identified that the demographic processes and life stages that had the strongest effect on the actual variation inλwere: (1) progressions of small and intermediate juveniles and (2) founding process from seeds to 1-year-old seedlings. These juvenile stages had medium sensitivities and variances that explained high upper-level LTRE contributions. Lower-level LTREs showed that the vital rates contributing the most were the growth rates of these juvenile stages. These findings demonstrate that progression from one stage to the next, growth rates of 1-year-old seedlings, and stunted aging juveniles are the most important stages in the population dynamics of this long-lived primary tree species. Transition matrix elements with high elasticities had little effect on the variation inλ, indicating that high-elasticity vital rates do not necessarily drive variation in population growth. As compared with the results of randomization tests, significant differences in vital rates examined using ANOVA or χ2tests showed that typhoon disturbance had the greatest effect on the demographic parameters of individual trees.