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Differential stoichiometric homeostasis and growth in two native and two invasive C3 grasses.
Oecologia ( IF 2.7 ) Pub Date : 2020-08-19 , DOI: 10.1007/s00442-020-04734-5
Joshua T Harvey 1, 2 , A Joshua Leffler 1
Affiliation  

Global changes interact with plant invasions by differentially impacting native and invasive species. For example, invasive plants often benefit from eutrophication to a greater degree than native plants. While this is well-documented, a broad, trait-based explanation for this phenomenon is lacking. Recent research shows that stoichiometric homeostasis predicts plant species responses to eutrophication and drought, but this research has not been extended into an invasion ecology paradigm. We tested the hypotheses that stoichiometric homeostasis would differ between native and invasive plants, that expressed levels of stoichiometric homeostasis would respond to water availability, and that differences in stoichiometric homeostasis would match differences in growth. In a nutrient and water manipulation study, we found that stoichiometric homeostasis differed between native grasses (Elymus canadensis and Pascopyrum smithii) and invasive grasses (Agropyron cristatum and Bromus inermis), that differences in stoichiometric homeostasis matched differences in growth in well-watered grasses, and that expressed levels of stoichiometric homeostasis were stable across the water supply treatments. These results suggest that invasive plants maintain growth advantages over native plants in eutrophic conditions because of differential homeostatic requirements. We argue that stoichiometric homeostasis is therefore a useful functional trait to explain and predict differential native and invasive plant responses to global change.



中文翻译:

两种原生C2和两种侵入C3草的化学计量稳态差异和生长差异。

全球变化通过对原生物种和入侵物种的差异影响来与植物入侵互动。例如,与天然植物相比,外来入侵植物通常会从富营养化中获得更大程度的收益。尽管有充分的文献记载,但仍缺乏对此现象的广泛的基于特征的解释。最近的研究表明,化学计量的稳态可以预测植物物种对富营养化和干旱的反应,但是该研究尚未扩展到入侵生态学范式。我们测试了以下假设:本地植物和入侵植物之间的化学计量稳态会有所不同,化学计量稳态的表达水平将对水的利用作出响应,并且化学计量稳态的差异将匹配生长的差异。在营养和水处理研究中,加拿大Elymus canadensisPascopyrum smithii以及入侵性草(Agropyron cristatumBromus inermis),化学计量稳态的差异与浇水良好的草的生长差异相匹配,并且化学计量稳态的水平在供水处理中保持稳定。这些结果表明,由于不同的体内平衡要求,在富营养条件下,入侵植物比天然植物具有生长优势。因此,我们认为化学计量的稳态是一种有用的功能性状,可以解释和预测对全球变化的本地和入侵植物的不同反应。

更新日期:2020-08-19
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