Dispersal in a sterile lichen-forming fungus,<i>Thamnolia subuliformis</i>(Ascomycotina: Icmadophilaceae)This paper is one of a selection of papers published in the Special Issue on Systematics Research.

Cassie, David M.; Piercey‐Normore, Michele D.

doi:10.1139/b08-032

Cited by 32 publications

(2 citation statements)

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“…In Canadian subarctic regions, lichen surveys have been carried out in Yukon, British Columbia, Alberta (Thomson 1984a,b;Thomson & Ahti 1994), Northern Quebec (Chagnon & Boudreau 2019;Chagnon et al 2021), Labrador (Thomson 1984a,b;Walker 2007), Northwest Territories and Nunavut (Ahti et al 1973;Bird et al 1980Bird et al , 1981Gould 1994;Thomson et al 1969;Thomson 1984a,b), Churchill (Thomson 1984a,b) and the Wapusk National Park in Manitoba (Cassie & Piercey-Normore 2008;Piercey-Normore 2005, 2006, 2010Piercey-Normore et al 2016). However, given the extent of Canadian subarctic areas that remains un-or underexplored and the high biodiversity represented by lichens (Thomson 1984a,b), more efforts in sampling and monitoring lichen flora in subarctic regions are necessary.…”

Section: Introductionmentioning

confidence: 99%

Lichen communities across a subarctic region of Northern Quebec (Canada): conservation status, α- and β-diversity, and functional traits

Cerrejón,

Valeria,

Haughland

et al. 2024

Preprint

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Conservation of lichens is impeded by knowledge gaps on their distribution and habitat requirements. This is a significant issue in vast, isolated and harsh environment regions such as subarctic regions, where lichen communities remain under documented. Lichen biodiversity assessments provide useful insights to better understand the functions supported by these ecologically important and sensitive species. This study aims i) to describe the conservation status of lichen communities and their α- and β-diversity components across a subarctic region in Northern Quebec (190 km2), ii) to describe their functional traits across the habitat types found in this region, and iii) to identify habitat types constituting lichen biodiversity hotspots. Lichens were sampled in 45 plots in habitats ranging from coniferous and deciduous forests to bogs, fens and rocky outcrops. A total of 115 species of largely macrolichens, calicioid lichens and allied fungi were identified, of which 18% currently have ranks of conservation concern at the provincial level, and 38% are newly reported for the region (~124,000 km2 around our study area). Richness across plots averaged 36 ± 9 species and plots richer in microhabitats often harbored more species (R2 = 0.22). Differences in species composition were identified among plots and habitat types through NMDS and perMANOVA analyses (R2 = 0.35; p < 0.001), both being supported by differences in microhabitat composition (Mantel r = 0.22 and perMANOVA R2 = 0.29, respectively; p < 0.001). Thirty-five species showed significant preferences for a habitat based on the Pearson’s phi coefficient of association. Our analysis on functional traits revealed significant patterns of association with habitat types, including i) saxicolous species with rocky outcrops, ii) epiphytic/epixylic species and vegetative reproduction traits (soredia, isidia) with coniferous stands, and iii) species belonging to the Parmeliaceae family with fens. Rocky outcrops represented the main lichen biodiversity hotspots in the region, while other habitat types were also important for maintaining total and complementary biodiversity. We are confident that our methodological approach including systematic sampling, full habitat variability representation, and the evaluation of complementary biodiversity components, can be effectively applied to fill gaps on lichen biodiversity in other underexplored regions across the globe.

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Section: Introductionmentioning

confidence: 99%

Lichen communities across a subarctic region of Northern Quebec (Canada): conservation status, α- and β-diversity, and functional traits

Cerrejón,

Valeria,

Haughland

et al. 2024

Preprint

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“…Hypogymnia physodes produces numerous soredia and reproduces mainly vegetatively. Recent molecular studies have shown that genetic diversity in the lichens reproducing vegetatively is high and not lower than in the lichens that reproduce sexually [1][2][3]. Hypothetically, the preference of lichens for one type of substrate can be reflected in their genetic constitution.…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity of natural psammophilous populations of Hypogymnia physodes (L.) Nyl. on Polish seacoast dunes

et al. 2017

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Hypogymnia physodes is a lichenized fungus of the family Parmeliaceae. The aim of this study was to compare the level of genetic diversity in eight psammophilous and three epiphytic populations of this species from the Baltic coast in Poland, based on randomly amplified polymorphic DNA (RAPD) markers. In the reactions with nine primers, 153 fragments were obtained, of which 133 were polymorphic. In one reaction, from 0 (for lich2 primer) to 55 (for C02 primer) amplicons were obtained. A Dice's genetic similarity index matrix was constructed based on the results of RAPD marker polymorphism examination. The values of similarity indices ranged from 0.00 to 0.73. Results of this study confirm the separateness of all three epiphytic populations from those found on sand dunes (100% support, UPGMA/1000 trees).

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A worldwide phylogeography of the whiteworm lichens Thamnolia reveals three lineages with distinct habitats and evolutionary histories

Onuţ-Brännström

Tibell

Johannesson

2017

Ecology and Evolution

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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.

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Dispersal in a sterile lichen-forming fungus,Thamnolia subuliformis(Ascomycotina: Icmadophilaceae)This paper is one of a selection of papers published in the Special Issue on Systematics Research.

Cited by 32 publications

References 70 publications

Lichen communities across a subarctic region of Northern Quebec (Canada): conservation status, α- and β-diversity, and functional traits

Lichen communities across a subarctic region of Northern Quebec (Canada): conservation status, α- and β-diversity, and functional traits

Genetic diversity of natural psammophilous populations of Hypogymnia physodes (L.) Nyl. on Polish seacoast dunes

A worldwide phylogeography of the whiteworm lichens Thamnolia reveals three lineages with distinct habitats and evolutionary histories

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