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Phylogenetic trajectories during secondary succession in a Neotropical dry forest: Assembly processes, ENSO effects and the role of legumes
Perspectives in Plant Ecology, Evolution and Systematics ( IF 3.5 ) Pub Date : 2020-01-25 , DOI: 10.1016/j.ppees.2020.125513
Susana Maza-Villalobos , David D. Ackerly , Ken Oyama , Miguel Martínez-Ramos

Phylogenetic analysis of plant communities is useful for inferring ecological mechanisms driving forest succession. However, such analysis has scarcely been undertaken in tropical dry environments, especially for the dynamics of demographic components (i.e., recruited, surviving and dead plants) affecting the successional process. Here, we combine chronosequence and dynamic data to study the role of habitat filtering and limiting similarity in the old-field succession of a seasonal tropical dry forest subjected to strong climatic events (e.g., the El Niño Southern Oscillation (ENSO) and heavy rains). We documented successional changes in the phylogenetic structure and phylodiversity of regenerative communities (shrubs and trees ≤ 1 m in height), assessed phylogenetic changes in demographic components during succession, and explored the effects of interannual rainfall variation on such changes. Over five years, we monitored the dynamics of regenerative plant communities in a chronosequence of nine abandoned pastures (fallow age of 0–12 years) and three old-growth sites. For each year and site, we quantified changes in the standardized mean phylogenetic distance (MPD.OBS.Z) and phylodiversity (PD) of entire regenerative communities and recruited, surviving and dead plants. For each phylogenetic metric and demographic component, we assessed the effect of successional age, time (years), and interannual rainfall variation. Large variation in MPD.OBS.Z and PD was observed among sites and years, especially in the recently abandoned pastures. Overall, the phylogenetic community structure was clustered early in succession and became more random as succession advanced. Species from the order Fabales made especially strong contributions to the phylogenetic clustering, especially during the first years of succession. In dead plants, the MPD.OBS.Z and PD increased in the drier year due to the high mortality of plants from several clades (orders). The high prevalence of clustered and random phylogenetic structure suggests that abiotic filtering and stochastic processes are major structuring mechanisms in this successional system. Due the strong contribution of Fabales in the phylogenetic structure of regenerative communities of tropical dry forest, the effects of strong climatic events (e.g., ENSO) on Fabales could influence the old-field succession of tropical dry forests.



中文翻译:

新热带旱林次生演替过程中的系统发生轨迹:组装过程,ENSO效应和豆类的作用

植物群落的系统发育分析对于推断推动森林演替的生态机制很有用。但是,这种分析很少在热带干燥环境中进行,尤其是对于影响演替过程的人口统计要素(即,新兵,存活的和枯死的植物)的动态。在这里,我们结合时间序列和动态数据来研究栖息地过滤和限制相似性在遭受强烈气候事件(例如厄尔尼诺南方涛动(ENSO)和大雨)的季节性热带干燥森林的旧田演替中的作用。 。我们记录了再生群落(灌木和树木≤1 m的树)的系统发育结构和多样性的演替变化,评估了演替过程中人口组成的系统发生变化,并探讨了年际降雨变化对这种变化的影响。在过去的五年中,我们在9个废弃草场(0-12岁的休耕期)和3个老树生长地点的时间序列中监测了可再生植物群落的动态。对于每一年和每个地点,我们量化了整个再生社区以及被征募,存活和死亡的植物的标准化平均系统发生距离(MPD.OBS.Z)和系统多样性(PD)的变化。对于每个系统发育指标和人口统计组成部分,我们评估了演替年龄,时间(年)和年际降雨量变化的影响。在地点和年份之间,尤其是在最近废弃的牧场中,MPD.OBS.Z和PD的变化很大。总体而言,系统发育群落结构在早期相继聚集,并且随着相继发展而变得更加随机。来自Fabales阶的物种对系统发生聚类做出了特别重要的贡献,尤其是在演替的头几年。在枯死的植物中,由于干燥时来自多个进化枝(订单)的植物的高死亡率,MPD.OBS.Z和PD在较干燥的年份有所增加。簇状和随机系统发生结构的高度流行表明,非生物过滤和随机过程是该演替系统中的主要结构机制。由于Fabales在热带干旱森林再生群落的系统发育结构中做出了巨大贡献,因此强烈的气候事件(例如ENSO)对Fabales的影响可能会影响热带干旱森林的老场演替。特别是在继承的头几年。在枯死的植物中,由于干燥时来自多个进化枝(订单)的植物的高死亡率,MPD.OBS.Z和PD在较干燥的年份有所增加。簇状和随机系统发生结构的高度流行表明,非生物过滤和随机过程是该演替系统中的主要结构机制。由于Fabales在热带干旱森林再生群落的系统发育结构中做出了巨大贡献,因此强烈的气候事件(例如ENSO)对Fabales的影响可能会影响热带干旱森林的老场演替。特别是在继承的头几年。在枯死的植物中,由于干燥时来自多个进化枝(订单)的植物的高死亡率,MPD.OBS.Z和PD在较干燥的年份增加。簇状和随机系统发生结构的高度流行表明,非生物过滤和随机过程是该演替系统中的主要结构机制。由于Fabales在热带干旱森林再生群落的系统发育结构中做出了巨大贡献,因此强烈的气候事件(例如ENSO)对Fabales的影响可能会影响热带干旱森林的老场演替。簇状和随机系统发生结构的高度流行表明,非生物过滤和随机过程是该演替系统中的主要结构机制。由于Fabales在热带干旱森林再生群落的系统发育结构中做出了巨大贡献,因此强烈的气候事件(例如ENSO)对Fabales的影响可能会影响热带干旱森林的老场演替。簇状和随机系统发生结构的高度流行表明,非生物过滤和随机过程是该演替系统中的主要结构机制。由于Fabales在热带干旱森林再生群落的系统发育结构中做出了巨大贡献,因此强烈的气候事件(例如ENSO)对Fabales的影响可能会影响热带干旱森林的老场演替。

更新日期:2020-03-27
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