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Unravelling intricate interactions among atmospheric bromeliads with highly overlapping niches in seasonal systems.
Plant Biology ( IF 4.2 ) Pub Date : 2020-01-02 , DOI: 10.1111/plb.13073
C J N Chaves 1 , D R Rossatto 1, 2
Affiliation  

Biotic and abiotic interactions are important factors that explain community assembly. For example, epiphytic communities are shaped by tree traits that can act as environmental filters, but also by positive and/or negative interactions among coexisting epiphytes on a tree. Here, we studied interactions among three widespread atmospheric bromeliads with overlapping niches (Tillandsia recurvata, T. tricholepis and T. pohliana), using experimental data about facilitation through seed capture, interspecific interaction during seed germination and competition among adult individuals. We aim to understand how species interactions are reflected in the natural coexisting patterns of epiphytes in communities at high and low tree densities. Tillandsia pohliana showed higher facilitation by capturing almost all wind-dispersing seeds, and had the largest reduction in seed germination in the presence of any adult individual, also presenting a relatively high rate of adult mortality in the presence of other individuals. Our results indicate higher colonisation ability for T. pohliana and distinct strategies of rapid exploitation of T. recurvata and T. tricholepis individuals. In natural communities, the coexistence among atmospheric bromeliads may be hampered by dispersal limitations in wind-dispersed epiphytes at high tree density conditions, but a negative effect of T. recurvata on T. pohliana is still reflected in their reduced coexistence. However, competitive patterns observed in the experimental data may be overshadowed by a possible mass effect driving large communities under such conditions. Our results show the joint effect of positive interactions and high dispersal levels on the community patterns of atmospheric bromeliads.

中文翻译:

揭示凤梨科植物与季节性系统中高度重叠的生态位之间的错综复杂的相互作用。

生物和非生物的相互作用是解释社区聚集的重要因素。例如,附生群落由可以充当环境过滤器的树木特征塑造,而且还由树木上共存的附生植物之间的正向和/或负向相互作用形成。在这里,我们使用有关通过种子捕获促进,种子萌发期间种间相互作用和成年个体竞争的实验数据,研究了三个重叠的生态位(铁兰(Tillandsia recurvata),T。tricholepis和T. pohliana)之间的广泛分布的凤梨科动物之间的相互作用。我们旨在了解高低密度社区中附生植物的自然共存模式如何反映物种之间的相互作用。铁兰(Tillandsia pohliana)通过捕获几乎所有散布在风中的种子显示出更高的促成作用,并且在任何成年个体的存在下,种子发芽的减少最大,在其他个体存在的情况下,成年死亡率也相对较高。我们的结果表明,较高的定植能力对T. pohliana以及快速利用T. recurvata和T. tricholepis个体的独特策略。在自然社区中,大气凤梨科植物之间的共存可能会因在高树密度条件下风散附生植物中的传播限制而受到阻碍,但雷氏梭菌对小叶蝉的不利影响仍然反映在它们的共存减少上。但是,在这种情况下,实验数据中观察到的竞争模式可能会被驱动大型社区的质量效应所掩盖。
更新日期:2020-01-02
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