首页> 外文期刊>Edinburgh journal of botany >ARE LICHEN GROWTH FORM CATEGORIES SUPPORTED BY CONTINUOUS FUNCTIONAL TRAITS: WATER-HOLDING CAPACITY AND SPECIFIC THALLUS MASS?
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ARE LICHEN GROWTH FORM CATEGORIES SUPPORTED BY CONTINUOUS FUNCTIONAL TRAITS: WATER-HOLDING CAPACITY AND SPECIFIC THALLUS MASS?

机译:苔藓生长形式类别是否由连续的功能性状支持:持水能力和比菌体质量?

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摘要

The focus of community ecology has shifted from the description of taxonomic composition towards an understanding of community assembly based on species’ ‘functional traits’. The functional trait approach is well developed for vascular plants, utilising variability of continuous phenotypic characters that affect ecological fitness, such as specific leaf area, tissue nitrogen concentration or seed mass, to explain community structure. In contrast, community assembly studies for poikilohydric cryptogamic plants and fungi, such as lichens, remain focused on broad categorical traits such as growth form difference: fruticose, foliose or crustose. This study examined intra- and interspecific variability for two highly promising continuous phenotypic measurements that affect lichen physiology and ecological fitness: water-holding capacity (WHC) and specific thallus mass (STM). Values for WHC and STM were compared within and among species, and within and among key macrolichen growth forms (fruticose and green-algal and cyanolichen foliose species), asking whether these widely used categories adequately differentiate the continuous variables (WHC and STM). We show large intra- and interspecific variability that does not map satisfactorily onto growth form categories, and on this basis provide recommendations and caveats in the future use of lichen functional traits.
机译:群落生态学的重点已从分类组成描述转向基于物种“功能性状”的群落组装理解。维管植物的功能性状方法得到了很好的发展,利用影响生态适应性的连续表型特征的变异性,如比叶面积、组织氮浓度或种子质量,来解释群落结构。相比之下,对水合质隐生植物和真菌(如地衣)的群落组装研究仍然集中在广泛的分类性状上,例如生长形式差异:果糖、叶状或硬壳。本研究检查了影响地衣生理学和生态适应性的两种非常有前途的连续表型测量的种内和种间变异性:持水能力 (WHC) 和比菌体质量 (STM)。比较了物种内和物种之间以及主要大地衣生长形式(果糖、绿藻和蓝苔藓叶状物种)内部和之间的WHC和STM值,询问这些广泛使用的类别是否充分区分了连续变量(WHC和STM)。我们显示出较大的种内和种间变异性,不能令人满意地映射到生长形式类别上,并在此基础上为未来使用地衣功能性状提供建议和警告。

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