Journal
FUNGAL DIVERSITY
Volume 64, Issue 1, Pages 233-251Publisher
SPRINGER
DOI: 10.1007/s13225-013-0271-4
Keywords
Chemistry; Ecology; Morphology; Multigene phylogeny; Phylogeography; Symbiosis
Categories
Funding
- Austrian Science Foundation [T481-B20, FWF P25237]
- Spanish Ministry of Economy and Competitiveness [CTM2012-38222-C02-02]
- SYNTHESYS Project
- European Community Research Infrastructure Action under the FP7 Capacities Program
- Austrian Science Fund (FWF) [T 481] Funding Source: researchfish
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Understanding how many species exist and the processes by which they form remains a central topic of ecological and evolutionary biology, but represents a special challenge within microbial groups. The lichen-forming fungi represent one of the best examples in which species evolution and diversity create patterns of high phenotypic plasticity coupled with wide geographic distributions. We sampled the lichen-forming species Tephromela atra and related species at a world-wide scale to reconstruct a phylogenetic hypothesis using three nuclear markers. Samples were also studied for morphological and chemical traits to assess how well the phenotypic relationships with species, previously segregated from T. atra, agrees with molecular data. We used a genealogical concordance approach and identified 15 monophyletic clades, which may represent independent lineages. By combining morphological and chemical characters, ecological preferences and geographic origin we distinguish six different species. Although subtle phenotypical traits are frequently used for describing previously cryptic species in fungi, the continuum of variability found in morphology and chemical patterns in T. atra prevents the description of new taxa with characteristic traits. We observed that phenotypic characters arise in parallel at local or regional scale but are not correlated with genetic isolation. Therefore, they are insufficient for characterizing species with broad geographic ranges within T. atra.
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