Article (Scientific journals)
High diversity, high insular endemism and recent origin in the lichen genus Sticta (lichenized Ascomycota, Peltigerales) in Madagascar and the Mascarenes
Simon, Antoine; Goffinet, Bernard; Magain, Nicolas et al.
2018In Molecular Phylogenetics and Evolution, 22, p. 15–28
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Keywords :
Biogeography; Indian Ocean; Lobariaceae; Photomorph; Radiation
Abstract :
[en] 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.
Research center :
Biological Sciences from Molecules to Systems - inBioS
Disciplines :
Environmental sciences & ecology
Author, co-author :
Simon, Antoine ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Biologie de l'évolution et de la conservation - aCREA-Ulg
Goffinet, Bernard;  University of Connecticut - UCONN > Ecology and Evolutionary Biology > Goffinet Lab
Magain, Nicolas  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Biologie de l'évolution et de la conservation - aCREA-Ulg
Sérusiaux, Emmanuël ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Biologie de l'évolution et de la conservation - aCREA-Ulg
Language :
English
Title :
High diversity, high insular endemism and recent origin in the lichen genus Sticta (lichenized Ascomycota, Peltigerales) in Madagascar and the Mascarenes
Publication date :
2018
Journal title :
Molecular Phylogenetics and Evolution
ISSN :
1055-7903
eISSN :
1095-9513
Publisher :
Elsevier, Atlanta, United States
Volume :
22
Pages :
15–28
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]
NSF - National Science Foundation [US-VA]
Available on ORBi :
since 02 February 2018

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