地衣物种复合体中密切相关基因型的规模依赖共现模式

Q2 Agricultural and Biological Sciences
Ekaphan Kraichak, Luis Allende, W. Obermayer, R. Lücking, H. Lumbsch
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引用次数: 1

摘要

摘要“竞争亲缘”假说认为共生类群的亲缘关系较远,因为竞争较低。这一假说因其依赖于未经检验的假设,并排除了除竞争和生境过滤之外的其他组装力来解释密切相关分类群的共存而受到批评。本文分析了生长于北半球温带森林的单系植物藓类复合体(Graphis scripta complex)中地衣真菌共生个体的模式。我们生成了三个核糖体和蛋白质标记(nuLSU, RPB2, EF-1)的序列,并将它们与先前生成的序列相结合,重建了该复合体的最新系统发育。通过计算共同发生的样本之间的平均成对距离(SES.MPD)的标准效应大小,以确定它们是否比偶然预期的更聚集,由此产生的系统发育用于确定区域和样本(树)尺度上共同发生的模式。由此产生的系统发育揭示了多个不同的谱系,表明在这个复合体中存在几个系统发育物种。在区域和本地(站点)级别,SES。MPD在6个区域中有5个区域表现出显著的聚集性。样本(树)表示SES。MPD值也表明了一些聚类,但相应的指标并没有明显偏离零期望。SES的差异。MPD值及其意义表明,栖息地过滤和/或局部多样化可能在区域层面上起作用,而每棵树上的局部聚集被解释为局部竞争或随机殖民化的结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Scale-dependent co-occurrence patterns of closely related genotypes in a lichen species complex
Abstract The ‘competition-relatedness’ hypothesis postulates that co-occurring taxa should be more distantly related, because of lower competition. This hypothesis has been criticized for its dependence on untested assumptions and its exclusion of other assembly forces beyond competition and habitat filtering to explain the co-existence of closely related taxa. Here we analyzed the patterns of co-occurring individuals of lichenized fungi in the Graphis scripta complex, a monophyletic group of species occurring in temperate forests throughout the Northern Hemisphere. We generated sequences for three nuclear ribosomal and protein markers (nuLSU, RPB2, EF-1) and combined them with previously generated sequences to reconstruct an updated phylogeny for the complex. The resulting phylogeny was used to determine the patterns of co-occurrences at regional and at sample (tree) scales by calculating standard effect size of mean pairwise distance (SES.MPD) among co-occurring samples to determine whether they were more clustered than expected from chance. The resulting phylogeny revealed multiple distinct lineages, suggesting the presence of several phylogenetic species in this complex. At the regional and local (site) levels, SES.MPD exhibited significant clustering for five out of six regions. The sample (tree) scale SES. MPD values also suggested some clustering but the corresponding metrics did not deviate significantly from the null expectation. The differences in the SES.MPD values and their significance indicated that habitat filtering and/or local diversification may be operating at the regional level, while the local assemblies on each tree are interpreted as being the result of local competition or random colonization.
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来源期刊
Plant and Fungal Systematics
Plant and Fungal Systematics Agricultural and Biological Sciences-Plant Science
CiteScore
2.40
自引率
0.00%
发文量
2
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