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High diversity, high insular endemism and recent origin in the lichen genus Sticta (lichenized Ascomycota, Peltigerales) in Madagascar and the Mascarenes.
- Source :
-
Molecular phylogenetics and evolution [Mol Phylogenet Evol] 2018 May; Vol. 122, pp. 15-28. Date of Electronic Publication: 2018 Jan 31. - Publication Year :
- 2018
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Abstract
- Lichen biodiversity and its generative evolutionary processes are practically unknown in the MIOI (Madagascar and Indian Ocean Islands) biodiversity hotspot. We sought to test the hypothesis that lichenized fungi in this region have undergone a rapid radiation, following a single colonization event, giving rise to narrow endemics, as is characteristic of other lineages of plants. We extensively sampled specimens of the lichen genus Sticta in the Mascarene archipelago (mainly Réunion) and in Madagascar, mainly in the northern range (Amber Mt and Marojejy Mt) and produced the fungal ITS barcode sequence for 148 thalli. We further produced a four-loci data matrix for 68 of them, representing the diversity and geographical distribution of ITS haplotypes. We reconstructed the phylogenetic relationships within this group, established species boundaries with morphological context, and estimated the date of the most recent common ancestor. Our inferences resolve a robust clade comprising 31 endemic species of Sticta that arose from the diversification following a single recent (c. 11 Mya) colonization event. All but three species have a very restricted range, endemic to either the Mascarene archipelago or a single massif in Madagascar. The first genus of lichens to be studied with molecular data in this region underwent a recent radiation, exhibits micro-endemism, and thus exemplifies the biodiversity characteristics found in other taxa in Madagascar and the Mascarenes.<br /> (Copyright © 2018 Elsevier Inc. All rights reserved.)
- Subjects :
- Ascomycota genetics
Biodiversity
Biological Evolution
DNA, Mitochondrial chemistry
DNA, Mitochondrial classification
DNA, Mitochondrial genetics
Fungal Proteins chemistry
Fungal Proteins classification
Fungal Proteins genetics
Haplotypes
Madagascar
Phylogeny
RNA Polymerase II chemistry
RNA Polymerase II classification
RNA Polymerase II genetics
Ascomycota classification
Subjects
Details
- Language :
- English
- ISSN :
- 1095-9513
- Volume :
- 122
- Database :
- MEDLINE
- Journal :
- Molecular phylogenetics and evolution
- Publication Type :
- Academic Journal
- Accession number :
- 29360617
- Full Text :
- https://doi.org/10.1016/j.ympev.2018.01.012