Evolutionary history constrains heat tolerance of native and exotic tropical Zingiberales
Evolutionary history constrains heat tolerance of native and exotic tropical Zingiberales
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DOI：
10.1111/1365-2435.14191
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发表时间：
2022-10-02
影响因子：
5.2
通讯作者：
Garcia-Robledo，Carlos
中科院分区：
文献类型：
--
作者：
Hernandez，Georgia G.;Perez，Timothy M.;Garcia-Robledo，Carlos
热带湿润森林植物全年温度相对稳定。然而，热带森林代表了以不同温度为特征的栖息地的镶嵌。预计耐热性将适应其栖息地的特定温度。尽管共享相似环境的物种的耐热性预计是相似的，但耐热性也可能受到进化历史的限制，因为密切相关的物种通常表现出相似的生理机能。当外来物种被引入新的群落时，它们先前对高温和其他生理、遗传和人口特征的适应可能会促进殖民化，这可能会给它们带来一些竞争优势。温度升高可能代表着影响群落聚集的强大环境过滤器，而更高的耐热性可以促进外来物种在新环境中的持久存在。利用来自中美洲哥斯达黎加不同热带栖息地的 32 种本地姜目物种和 7 种外来姜目物种组成的群落，我们旨在回答以下问题：（a）进化历史是否限制了耐热性？ (b) 同一栖息地的植物是否表现出相似的耐热性？ (c) 外来物种的耐热性与本地物种不同吗？我们测量了光合荧光随温度变化的变化，以确定观察到光系统 II 首次出现损坏迹象的温度 (T15)，以及光系统 II 的荧光降低 50% 时的温度 (T50)。使用群落系统发育，我们测试了 T15 和 T50 中的系统发育信号。此外，我们还测试了老生区、次生林和开放地区的生姜目以及本地物种和外来物种之间的耐热性差异。我们的结果支持（a）T15和T50均具有显着的系统发育信号（Pagel'sλ），（b）与来自老生区和次生林的物种相比，来自开放地区的群落表现出相似的光合耐热性，以及（c）外来生姜目是 比本地物种稍微耐受高温，但仅限于 T15。我们的结果表明，进化历史限制了本土和外来姜目动物在变暖的世界中的热反应。在期刊博客上阅读本文的免费简单语言摘要。
Tropical wet forest plants experience relatively stable temperatures throughout the year. However, tropical forests represent a mosaic of habitats characterized by different temperatures. Heat tolerances are expected to be adapted to temperatures specific to their habitats. Although heat tolerance of species sharing similar environments is expected to be similar, it is also possible that heat tolerance is constrained by evolutionary history because closely related species usually display similar physiologies. When exotic species are introduced to novel communities, colonization may be facilitated by their previous adaptation to high temperatures and other physiological, genetic and demographic traits, which may grant them some competitive advantage. Increasing temperatures may represent a strong environmental filter affecting community assembly, and higher heat tolerances could facilitate the persistence of exotic species in novel environments.Using a community of 32 native and 7 exotic Zingiberales species from different tropical habitats in Costa Rica, Central America, we aim to answer the following questions: (a) does evolutionary history constrain heat tolerance? (b) do plants in the same habitat display similar heat tolerances? (c) do the heat tolerances of exotic species differ from those of native species?We measured temperature‐dependent changes in photosynthetic fluorescence to determine the temperature at which the first sign of damage to photosystem II is observed (T15), and the temperature at which the fluorescence of photosystem II is reduced by 50% (T50). Using a community phylogeny, we tested for phylogenetic signal inT15andT50. In addition, we tested for differences in heat tolerance among Zingiberales from old growth, secondary forests and open areas, as well as between native and exotic species.Our results support (a) a significant phylogenetic signal (Pagel'sλ) for bothT15andT50, (b) communities from open areas displayed similar photosynthetic heat tolerance compared to species from old growth and secondary forests, and (c) exotic Zingiberales are marginally tolerant to high temperatures than native species, but only forT15. Our results suggest that evolutionary history constraints heat responses of native and exotic Zingiberales in a warming world.Read the free Plain Language Summary for this article on the Journal blog.