无穷无尽的形式最令人沮丧:厘清 Ramalina decipiens 群(子囊菌目,子囊菌科)的物种界限,并描述六个新物种和该群的检索表

IF 9.5 1区 生物学 Q1 MYCOLOGY Persoonia Pub Date : 2024-06-30 DOI:10.3767/persoonia.2024.52.03
M. Blázquez, I. Pérez-Vargas, I. Garrido-Benavent, M. Villar-dePablo, Y. Turégano, C. Frías-López, A. Sánchez-Gracia, A. de los Ríos, F. Gasulla, S. Pérez-Ortega
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The factors that drive evolutionary radiations have been studied for decades in charismatic organisms such as birds or lizards, but are lacking in lichen-forming fungi, despite recent reports of some lineages showing diversification\npatterns congruent with radiation.Here we propose the <i>Ramalina decipiens</i> group as a model system in which to carry out such studies. This group is currently thought to be comprised of five saxicolous species, all of them endemic to the Macaronesian region (the Azores, Madeira, Selvagens,\nCanary, and Cape Verde islands). Three species are single-island endemics (a rare geographic distribution pattern in lichens), whereas two are widespread and show extreme morphological variation. The latter are suspected to harbor unrecognized species-level lineages.In order to use the <i>Ramalina\ndecipiens</i> group as a model system, it is necessary to resolve the group's phylogeny and to clarify its species boundaries. 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引用次数: 0

摘要

海洋岛屿被认为是研究各种进化过程的天然实验室。其中一个进化过程就是进化辐射,即从一个祖先进化成许多物种,这些物种栖息在不同的环境中,它们利用这些环境的特征也各不相同。几十年来,人们一直在研究鸟类或蜥蜴等有魅力生物的进化辐射驱动因素,但在地衣形成真菌中却缺乏研究,尽管最近有报道称一些菌系显示出与辐射一致的多样化模式。目前认为该类群由 5 个萨克斯科物种组成,它们都是马卡罗内斯地区(亚速尔群岛、马德拉群岛、塞尔瓦根群岛、加那利群岛和佛得角群岛)的特有物种。其中三个物种是单岛特有种(这在地衣中是一种罕见的地理分布模式),另外两个物种分布广泛,形态差异极大。为了将 Ramalinadecipiens 群作为一个模式系统,有必要解决该群的系统发育问题并明确其物种界限。在本研究中,我们尝试采用综合分类法来实现这一目标。我们基于六个分子标记(其中四个是新开发的)构建了一棵系统发生树,并根据分子(基于单位点和多焦点数据集的物种发现策略)和表型数据(基于形态学、次生化学和地理起源的无监督聚类算法)生成了相互竞争的物种假说。因此,我们描述了六个新物种,其中大部分是单岛特有物种,并提供了该类群的检索表。物种之间的系统发育关系已得到几乎完全支持的重建,再加上该群的特有性,使其成为研究地衣形成真菌的岛屿辐射的绝佳系统。
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Endless forms most frustrating: disentangling species boundaries in the Ramalina decipiens group (Lecanoromycetes, Ascomycota), with the description of six new species and a key to the group
Oceanic islands have been recognized as natural laboratories in which to study a great variety of evolutionary processes. One such process is evolutionary radiations, the diversification of a single ancestor into a number of species that inhabit different environments and differ in the traits that allow them to exploit those environments. The factors that drive evolutionary radiations have been studied for decades in charismatic organisms such as birds or lizards, but are lacking in lichen-forming fungi, despite recent reports of some lineages showing diversification patterns congruent with radiation.Here we propose the Ramalina decipiens group as a model system in which to carry out such studies. This group is currently thought to be comprised of five saxicolous species, all of them endemic to the Macaronesian region (the Azores, Madeira, Selvagens, Canary, and Cape Verde islands). Three species are single-island endemics (a rare geographic distribution pattern in lichens), whereas two are widespread and show extreme morphological variation. The latter are suspected to harbor unrecognized species-level lineages.In order to use the Ramalina decipiens group as a model system, it is necessary to resolve the group's phylogeny and to clarify its species boundaries. In this study, we attempt to do so following an integrative taxonomy approach. We constructed a phylogenetic tree based on six molecular markers, four of which are newly developed, and generated competing species hypotheses based on molecular (species discovery strategies based on both single locus and multilocus datasets) and phenotypic data (unsupervised clustering algorithms based on morphology, secondary chemistry, and geographic origin).We found that taxonomic diversity in the Ramalina decipiens group has been highly underestimated in previous studies. In consequence, we describe six new species, most of them single-island endemics, and provide a key to the group. Phylogenetic relationships among species have been reconstructed with almost full support which, coupled with the endemic character of the group, makes it an excellent system for the study of island radiations in lichen-forming fungi.
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来源期刊
Persoonia
Persoonia MYCOLOGY-
CiteScore
17.70
自引率
5.50%
发文量
10
审稿时长
3 months
期刊介绍: Persoonia aspires to publish papers focusing on the molecular systematics and evolution of fungi. Additionally, it seeks to advance fungal taxonomy by employing a polythetic approach to elucidate the genuine phylogeny and relationships within the kingdom Fungi. The journal is dedicated to disseminating high-quality papers that unravel both known and novel fungal taxa at the DNA level. Moreover, it endeavors to provide fresh insights into evolutionary processes and relationships. The scope of papers considered encompasses research articles, along with topical and book reviews.
期刊最新文献
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