10.5061/DRYAD.79D91
Onuţ-Brännström, Ioana
Uppsala University
Tibell, Leif
Uppsala University
Johannesson, Hanna
Uppsala University
Data from: A worldwide phylogeography of the whiteworm lichen Thamnolia
vermicularis reveals three lineages with distinct habitats and
evolutionary histories
Dryad
dataset
2018
Thamnolia subuliformis
clonality
Symbiosis
Thamnolia papelillo
Thamnolia vermicularis
lichens
chemical variation
Holocene
Thamnolia
2018-02-03T00:00:00Z
2018-02-03T00:00:00Z
en
https://doi.org/10.1002/ece3.2917
112651 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Thamnolia is a lichenized fungus with an extremely wide distribution,
being encountered in arctic and alpine environments in most continents. In
this study, we used molecular markers to investigate the population
structure of the fungal symbiont and the associated photosynthetic partner
of Thamnolia. By analyzing molecular, morphological, and chemical
variation among 253 specimens covering the species distribution range, we
revealed the existence of three mycobiont lineages. One lineage (Lineage
A) is confined to the tundra region of Siberia and the Aleutian Islands, a
second (Lineage B) is found in the high alpine region of the Alps and the
Carpathians Mountains, and a third (Lineage C) has a worldwide
distribution and covers both the aforementioned ecosystems. Molecular
dating analysis indicated that the split of the three lineages is older
than the last glacial maximum, but the distribution ranges and the
population genetic analyses suggest an influence of last glacial period on
the present-day population structure of each lineage. We found a very low
diversity of Lineage B, but a higher and similar one in Lineages A and C.
Demographic analyses suggested that Lineage C has its origin in the
Northern Hemisphere, possibly Scandinavia, and that it has passed through
a bottleneck followed by a recent population expansion. While all three
lineages reproduce clonally, recombination tests suggest rare or past
recombination in both Lineages A and C. Moreover, our data showed that
Lineage C has a comparatively low photobiont specificity, being found
associated with four widespread Trebouxia lineages (three of them also
shared with other lichens), while Lineages A and B exclusively harbor T.
simplex s. lat. Finally, we did not find support for the recognition of
taxa in Thamnolia based on either morphological or chemical characters.
Fasta and tree files used for the analysesThe folder contains the fasta
files used to generate the ML phylogenies, the tree files generated, the
scaffolds of the four fungal genomes and the fasta files used for
recombination analyses. For further information see the "read
me" text with explanations for each file.Fasta_and_tree_files.zip
South America
Asia
Europe
North America