Universidade Federal de Minas Gerais - UFMG, Programa de Pós-graduação em Ecologia, Conservação e Manejo da Vida Silvestre, Departamento de Genética, Ecologia e Evolução, Belo Horizonte, MG, Brasil.
Universidade Federal de Minas Gerais - UFMG, Centro de Síntese Ecológica e Conservação, Departamento de Genética, Ecologia e Evolução, Belo Horizonte, MG, Brasil.
Braz J Biol. 2022 Mar 7;84:e257969. doi: 10.1590/1519-6984.257969. eCollection 2022.
In this study, we evaluated variation in vegetative and reproductive phenological events of four phylogenetically related plant species subjected to a seasonal environment. To this aim, we sampled 15 individuals of each plant species every fortnight for one year, between January and December of 2017. To assess when a given phenophase occurred more intensely in the population, the Fournier intensity index was used and the synchrony of individuals of the sample in a given phenological event was estimated using the activity index. The Rayleigh (Z) test was used to determine whether the phenological events have seasonal distribution. The relationship of abiotic factors (photoperiod, precipitation, relative humidity and temperature) with the intensity of phenophases was evaluated for each plant species using generalized linear models (GLMs). The phenophases of all plants showed a seasonal distribution pattern, as well as variation in synchrony of phenophases and specific sets of abiotic factors significantly influenced their phenophases. New leaves, for example, were produced throughout the seasons, with intense leaf fall in the dry season. Flowering periods, on the other hand, did not overlap. Indeed, species exhibited sequential flowering and asynchronous flowering among individuals. Our results suggest that the phenological patterns of four sympatric plant species are directly linked to climatic variables, but different abiotic factors affected different phenophases.
在这项研究中，我们评估了四个系统发育相关植物物种在季节性环境下的营养和生殖物候事件的变化。为此，我们在 2017 年 1 月至 12 月之间，每两周对每种植物的 15 个个体进行采样，持续一年。为了评估给定物候阶段在群体中更强烈发生的时间，我们使用了福尼尔强度指数，并使用活动指数估计样本中个体在给定物候事件中的同步性。使用瑞利（Z）检验来确定物候事件是否具有季节性分布。使用广义线性模型（GLMs）评估每个植物物种的非生物因素（光照时间、降水、相对湿度和温度）与物候阶段强度之间的关系。所有植物的物候阶段都表现出季节性分布模式，物候阶段的同步性也存在变化，特定的一组非生物因素显著影响了它们的物候阶段。例如，新叶在整个季节中都有产生，而在旱季则有强烈的落叶现象。另一方面，花期并不重叠。事实上，物种表现出顺序开花和个体之间的异步开花。我们的结果表明，四种同域植物物种的物候模式直接与气候变量相关，但不同的非生物因素影响了不同的物候阶段。
