Accelerated Evolutionary Rates in Tropical and Oceanic Parmelioid Lichens (Ascomycota)

Overview

Journal BMC Evol Biol

Publisher Biomed Central

Specialty Biology

Date 2008 Sep 24

PMID 18808710

Citations 16

Authors

H Thorsten Lumbsch

Andrew L Hipp

Pradeep K Divakar

Oscar Blanco

Ana Crespo

Affiliations

Soon will be listed here.

Abstract

Background: The rate of nucleotide substitutions is not constant across the Tree of Life, and departures from a molecular clock have been commonly reported. Within parmelioid lichens, the largest group of macrolichens, large discrepancies in branch lengths between clades were found in previous studies. Using an extended taxon sampling, we test for presence of significant rate discrepancies within and between these clades and test our a priori hypothesis that such rate discrepancies may be explained by shifts in moisture regime or other environmental conditions.

Results: In this paper, the first statistical evidence for accelerated evolutionary rate in lichenized ascomycetes is presented. Our results give clear evidence for a faster rate of evolution in two Hypotrachyna clades that includes species occurring in tropical and oceanic habitats in comparison with clades consisting of species occurring in semi-arid and temperate habitats. Further we explore potential links between evolutionary rates and shifts in habitat by comparing alternative Ornstein-Uhlenbeck models.

Conclusion: Although there was only weak support for a shift at the base of a second tropical clade, where the observed nucleotide substitution rate is high, overall support for a shift in environmental conditions at cladogenesis is very strong. This suggests that speciation in some lichen clades has proceeded by dispersal into a novel environment, followed by radiation within that environment. We found moderate support for a shift in moisture regime at the base of one tropical clade and a clade occurring in semi-arid regions and a shift in minimum temperature at the base of a boreal-temperate clade.

Citing Articles

The First Miniature, Small Foliose, Brown in the Northern Hemisphere.

Amo de Paz G, Divakar P, Crespo A, Lumbsch H, Rico V J Fungi (Basel). 2024; 10(9).

PMID: 39330363 PMC: 11433398. DOI: 10.3390/jof10090603.

Regionally Varying Habitat Relationships in Lichens: The Concept and Evidence with an Emphasis on North-Temperate Ecosystems.

Lohmus A, Motiejunaite J, Lohmus P J Fungi (Basel). 2023; 9(3).

PMID: 36983509 PMC: 10056719. DOI: 10.3390/jof9030341.

Should we hail the Red King? Evolutionary consequences of a mutualistic lifestyle in genomes of lichenized ascomycetes.

Ametrano C, Lumbsch H, Di Stefano I, Sangvichien E, Muggia L, Grewe F Ecol Evol. 2022; 12(1):e8471.

PMID: 35136549 PMC: 8809443. DOI: 10.1002/ece3.8471.

Genome-Wide Analysis of Biosynthetic Gene Cluster Reveals Correlated Gene Loss with Absence of Usnic Acid in Lichen-Forming Fungi.

Pizarro D, Divakar P, Grewe F, Crespo A, Dal Grande F, Lumbsch H Genome Biol Evol. 2020; 12(10):1858-1868.

PMID: 33151307 PMC: 7643366. DOI: 10.1093/gbe/evaa189.

Different diversification histories in tropical and temperate lineages in the ascomycete subfamily Protoparmelioideae (Parmeliaceae).

Singh G, Dal Grande F, Schnitzler J, Pfenninger M, Schmitt I MycoKeys. 2018; (36):1-19.

PMID: 29997448 PMC: 6037653. DOI: 10.3897/mycokeys.36.22548.

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