Drought resistance does not explain epiphytic abundance of accidental epiphytes

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Vincent Hoeber, Moritz Klinghardt, G. Zotz
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引用次数: 10

Abstract

ABSTRACT Background Accidental epiphytism is common among vascular plants in forest ecosystems around the globe. A frequent observation in surveys of accidental epiphytes is the occurrence of few species with high epiphytic abundance, while most co-occurring terrestrial species are rarely found as epiphytes. Aims Based on the general assumption that water is the major limiting factor for epiphytic plants, we hypothesised that differences in drought resistance of accidental epiphytes explain the difference in epiphytic abundances. Methods We exposed 16 species with different epiphytic abundance in central Europe to experimentally induced drought during germination and growth of juvenile plants. Results Drought resistance differed substantially among species but did not correlate with their epiphytic abundance, neither during germination nor during juvenile growth. Conclusions In central Europe, accidental epiphytes are usually found on moss cushions or in accumulated arboreal soil on their host tree. In such water-storing substrates, water availability might be less limiting than it is for obligate epiphytes that typically grow on bare bark, which would explain the lack of a correlation between drought resistance and epiphytic abundance of the studied species. Hence, other factors must explain the consistent differences in epiphytic abundance, e.g. dispersal traits and mass effect.
抗旱性不能解释偶然附生植物的丰度
摘要背景在全球森林生态系统中,意外附生在维管植物中很常见。在偶然附生植物调查中,经常观察到少数附生植物丰度高的物种出现,而大多数共存的陆地物种很少作为附生植物出现。基于水分是附生植物的主要限制因素这一普遍假设,我们假设偶然附生植物抗旱性的差异可以解释附生植物丰度的差异。方法将中欧16种不同附生植物丰度的植物在幼株萌发和生长过程中暴露于实验诱导的干旱中。结果不同物种的抗旱性差异很大,但与附生植物的丰度无关,无论是在萌芽期还是在幼期。结论在中欧,偶然附生植物通常出现在寄主树的苔藓垫或堆积的树木土壤中。在这样的储水基质中,与通常生长在裸树皮上的专性附生植物相比,水的可利用性可能没有那么有限,这将解释所研究物种的抗旱性和附生植物丰度之间缺乏相关性的原因。因此,其他因素必须解释附生植物丰度的一致差异,例如扩散特征和群体效应。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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