Species delimitation in the cyanolichen genus Rostania

BMC Evolutionary Biology

article

Košuthová, Alica¹  Bergsten, Johannes²  Westberg, Martin³  Wedin, Mats¹ 

[1] Department of Botany;Department of Zoology;Uppsala University

关键词: Biodiversity;    Fungi;    Integrative taxonomy;    Lichens;    Phylogeny;    Symbiosis;    Systematics;   

DOI  :  10.1186/s12862-020-01681-w

学科分类：护理学

来源: BioMed Central

【 摘 要 】

In this study, we investigate species limits in the cyanobacterial lichen genus Rostania (Collemataceae, Peltigerales, Lecanoromycetes). Four molecular markers (mtSSU rDNA, β-tubulin, MCM7, RPB2) were sequenced and analysed with two coalescent-based species delimitation methods: the Generalized Mixed Yule Coalescent model (GMYC) and a Bayesian species delimitation method (BPP) using a multispecies coalescence model (MSC), the latter with or without an a priori defined guide tree. Species delimitation analyses indicate the presence of eight strongly supported candidate species. Conclusive correlation between morphological/ecological characters and genetic delimitation could be found for six of these. Of the two additional candidate species, one is represented by a single sterile specimen and the other currently lacks morphological or ecological supporting evidence. We conclude that Rostania includes a minimum of six species: R. ceranisca, R. multipunctata, R. occultata 1, R. occultata 2, R. occultata 3, and R. occultata 4,5,6. Three distinct Nostoc morphotypes occur in Rostania, and there is substantial correlation between these morphotypes and Rostania thallus morphology.

【 授权许可】

CC BY|CC0