Neogene speciation and Pleistocene expansion of the genus Pseudephebe (Parmeliaceae, lichenized fungi) involving multiple colonizations of Antarctica

Garrido‐Benavent, Isaac; Pérez‐Ortega, Sergio; Rı́os, Asunción de los; Mayrhofer, Helmut; Fernández-Mendoza, Fernando

doi:10.1016/j.ympev.2020.107020

Cited by 14 publications

(11 citation statements)

References 90 publications

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“…This is very different to what we encountered in previous macrolichen surveys ( 112 – 117 ) where species tend to comprise: a) few closely related haplotypes, identifiable as discrete lineages in phylogenetic trees and network reconstructions and b) few overrepresented haplotypes common across large geographic regions ( 115 , 118 , 119 ). The observed phylogenetic continuum is similar to that of Lecanora polytropa , a species complex proposed to comprise 70 putative species worldwide ( 62 ).…”

Section: Bodycontrasting

confidence: 99%

“…Haplotype diversity is reflected in low levels of sequence duplication, with 0.40-0.56 of sequences being unique, meanwhile the high nucleotide divergence between sequences is best reflected by having between 0.38 and 0.46 of sites being parsimony informative across all nucleotide alignments, excluding the outgroups. This is very different to what we encountered in previous macrolichen surveys (112)(113)(114)(115)(116)(117) where species tend to comprise: a) few closely related haplotypes, identifiable as discrete lineages in phylogenetic trees and network reconstructions and b) few overrepresented haplotypes common across large geographic regions (115,118,119). The observed phylogenetic continuum is similar to that of Lecanora polytropa, a species complex proposed to comprise 70 putative species worldwide (62).…”

Section: Bodycontrasting

confidence: 87%

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Introgressive Descent and Hypersexuality Drive The Evolution Of Sexual Parasitism and Morphological Reduction In a Fungal Species Complex

Fernández-Mendoza

Strasser

Frolov

et al. 2023

Preprint

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Taxonomists consider species as discrete units of biological organization, which are subject to a continuous process of evolutionary change and are connected through their shared ancestry. However, the continuous nature of evolutionary change is difficult to reconcile with the discrete outcome of speciation, especially where species boundaries are permeable. A good example of this inconsistency is the lichen genus Pyrenodesmia, which shows a high morphologic and genetic diversity that that defies systematization by taxonomic or phylogenetic methods. Here we show that hybridization explains the presence of discordant morphs and that European species are interconnected through cross-mating in a single reproductive network, a syngameon, despite which species remain largely distinct and distinguishable. Whole genome data reflect the important role played by genome defense mechanisms in the genomic stabilization of fungal hybrids. The recurrence of Repeat Induced Point mutations (RIP) shapes genomes with islands of suppressed recombination and loss of gene content, which in turn generates a feedback loop reinforcing the lack of reproductive isolation through the loss of heterokaryon incompatibility and a tendency towards morphological reduction.

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Section: Bodycontrasting

confidence: 99%

Section: Bodycontrasting

confidence: 87%

Introgressive Descent and Hypersexuality Drive The Evolution Of Sexual Parasitism and Morphological Reduction In a Fungal Species Complex

Fernández-Mendoza

Strasser

Frolov

et al. 2023

Preprint

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“…It is interesting that the glacial survival of C. aculeata in a refugium on King George Island (scenario 3), and admixture scenario 5, which could also account for the higher genetic diversity on King George Island, received the lowest support of all models. At any rate, the inferred postglacial colonisation of the South Shetland Islands fits nicely with similar results from other organismal groups, for example, the vascular plant Colobanthus quitensis (Biersma et al, 2020), the moss Chorisodontium aciphyllum (Biersma, Jackson, Bracegirdle, et al, 2018) and the lichen Pseudephebe minuscula (Garrido‐Benavent et al, 2021) all indicating that colonisation of the Antarctic was a recent event.…”

Section: Discussionsupporting

confidence: 76%

Effects of dispersal strategy and migration history on genetic diversity and population structure of Antarctic lichens

Lagostina

Andreev

Grande

et al. 2021

Journal of Biogeography

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Aim The homogenisation of historically isolated gene pools has been recognised as one of the most serious conservation problems in the Antarctic. Lichens are the dominant components of terrestrial biotas in the Antarctic and in high mountain ranges of southern South America. We study the effects of dispersal strategy and migration history on their genetic structure to better understand the importance of these processes and their interplay in shaping population structure as well as their relevance for conservation. Location Maritime Antarctic and southern South America. Methods Populations of three fruticose lichen species, Usnea aurantiacoatra, U. antarctica and Cetraria aculeata, were collected in different localities in the Maritime Antarctic and southern South America. Usnea aurantiacoatra reproduces sexually by ascospores, whereas the other two species mostly disperse asexually by symbiotic diaspores. Samples were genotyped at 8–22 microsatellite loci. Different diversity and variance metrics, Bayesian cluster analyses and Discriminant Analysis of Principal Components (DAPC) were used to study population genetic structure. Historical migration patterns between southern South America and the Antarctic were investigated for U. aurantiacoatra and C. aculeata by approximate Bayesian computation (ABC). Results The two vegetative species display lower levels of genetic diversity than U. aurantiacoatra. Antarctic populations of C. aculeata and South American populations of U. aurantiacoatra display much stronger genetic differentiation than their respective counterparts on the opposite side of the Drake Passage. Usnea antarctica was not found in South America but shows comparably low levels of genetic differentiation in Antarctica as those revealed for U. aurantiacoatra. Phylogeographic histories of lichens in the region differ strongly with recent colonisation in some instances and potential in situ persistence during Last Glacial Maximum (LGM) in others. Patterns of genetic diversity indicate the presence of glacial refugia near Navarino Island (South America) and in the South Shetland Islands. ABC analyses suggest that C. aculeata colonised the Antarctic from Patagonia after the LGM. Results for U. aurantiacoatra are ambiguous, indicating a more complex population history than expressed in the simplified scenarios. Main Conclusions Mode of propagation affects levels of genetic diversity, but the location of glacial refugia and postglacial colonisation better explains the diversity patterns displayed by each species. We found evidence for glacial in situ survival of U. aurantiacoatra on both sides of the Drake Passage and postglacial colonisation of Antarctica from South America by C. aculeata. Maintaining the strong genetic differentiation of Antarctic populations of C. aculeata requires strict conservation measures, whereas populations of U. aurantiacoatra are exposed to a much lower risk due to their higher diversity and connectivity.

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“…Dispersal of alpine and arctic lichens has received considerable attention in recent years. Frequent long‐distance dispersal has been documented for a number of alpine and arctic lichens (Fernández‐Mendoza & Printzen, 2013 ; Garrido‐Benavent et al., 2021 ; Geml et al., 2010 ; Onuţ‐Brännström et al., 2017 ) and a “mountain hopping” mechanism of dispersal explains, in part, the broad distribution of many alpine lichens (Garrido‐Benavent & Pérez‐Ortega, 2017 ). Therefore, the Rocky Mountains in North America play a fundamental role in understanding the processes that influence the distribution of alpine lichen communities (Garrido‐Benavent & Pérez‐Ortega, 2017 ; Hale et al., 2019 ; Weber, 2003 ).…”

Section: Introductionmentioning

confidence: 99%

Alpine lichen diversity in an isolated sky island in the Colorado Plateau, USA—Insight from an integrative biodiversity inventory

Leavitt

Hollinger

Summerhays

et al. 2021

Ecology and Evolution

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Neogene speciation and Pleistocene expansion of the genus Pseudephebe (Parmeliaceae, lichenized fungi) involving multiple colonizations of Antarctica

Cited by 14 publications

References 90 publications

Introgressive Descent and Hypersexuality Drive The Evolution Of Sexual Parasitism and Morphological Reduction In a Fungal Species Complex

Introgressive Descent and Hypersexuality Drive The Evolution Of Sexual Parasitism and Morphological Reduction In a Fungal Species Complex

Effects of dispersal strategy and migration history on genetic diversity and population structure of Antarctic lichens

Alpine lichen diversity in an isolated sky island in the Colorado Plateau, USA—Insight from an integrative biodiversity inventory

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