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Molecular phylogeny of the tribe Danaideae (Rubiaceae: Rubioideae): Another example of out-of-Madagascar dispersal
Stockholm University, Faculty of Science, Department of Botany.
Stockholm University, Faculty of Science, Department of Botany.
Stockholm University, Faculty of Science, Department of Botany.
2012 (English)In: Taxon, ISSN 0040-0262, E-ISSN 1996-8175, Vol. 61, no 3, 629-636 p.Article in journal (Refereed) Published
Abstract [en]

Extensive efforts have been made to resolve the phylogeny of the large coffee family (Rubiaceae) based on molecular data. As a result, several small tribes have been described, but the phylogenies and generic delimitations for many of these groups remain unclear. This study focuses on the small tribe Danaideae that belongs to subfamily Rubioideae and whose generic limits have not previously been addressed with molecular data. It is the sole rubiaceous tribe distributed almost entirely in the Western Indian Ocean region, with the exception of the East African Danais xanthorrhoea. The tribe consists of three genera: Danais, Payera (including the monotypic genus Coursiana), and Schismatoclada. We present the first molecular phylogenetic study of Danaideae including representatives from all three genera and using Bayesian and maximum parsimony methods and sequence data from nuclear DNA (nrITS) and chloroplast DNA (petD, psbA-trnH, rpl32-trnL(UAG), rps16). Our main objectives were to rigorously test the monophyly of Danaideae as currently circumscribed and assess phylogenetic relationships within the tribe. The findings of this study shed light on the colonization history of the tribe. Our analyses reaffirm the monophyly of Danaideae and Danais but reveal the paraphyly of Payera and Schismatoclada. The close relationship between the three Danaideae genera and Coursiana is supported. However, we found very little support for the inclusion of the latter genus in Payera as proposed earlier. The tribe is resolved in two morphologically distinct major lineages, the highly supported Damns clade with lianescent habit (= Danais sensu Buchner & Puff) and the Payera-Schismatoclada clade with arborescent habit. The Malagasy and Mauritian specimens of Danais fragrans are not closely related, and we restrict D. fragrans to the Mauritian taxa and resurrect Danais lyallii Baker to accommodate the Malagasy D. fragrans. According to our analysis. Madagascar is the origin of all species of Danaideae occurring in the Comoro archipelago, East Africa, and Mauritius. The Mauritian and East African Danais each is the result of a single colonization event, while there were at least two independent colonization events to the Comoros.

Place, publisher, year, edition, pages
2012. Vol. 61, no 3, 629-636 p.
Keyword [en]
biogeography, Danaideae, Danais, molecular systematics, Payera, Schismatoclada, Western Indian Ocean
National Category
Evolutionary Biology
Identifiers
URN: urn:nbn:se:su:diva-79900ISI: 000305439100011OAI: oai:DiVA.org:su-79900DiVA: diva2:551753
Note

AuthorCount:3;

Available from: 2012-09-12 Created: 2012-09-11 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Systematics and Biogeography of Western Indian Ocean Region Rubiaceae: examples from Danaideae, Hymenodictyeae, and Naucleeae
Open this publication in new window or tab >>Systematics and Biogeography of Western Indian Ocean Region Rubiaceae: examples from Danaideae, Hymenodictyeae, and Naucleeae
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis focuses on the systematics and biogeography of the tribes Danaideae, Hymenodictyeae, and Naucleeae in the angiosperm family Rubiaceae (coffee family), with a special interest in the Western Indian Ocean region (WIOR). The levels of endemism in the WIOR are remarkably high and Madagascar is the largest island surrounded by three main archipelagos with islands of various age and size. Rubiaceae is one of the species-rich families in the region, rendering it a suitable group for addressing evolutionary and biogeographic questions.

Danaideae consists of the two Malagasy endemic genera Payera and Schismatoclada, and the WIOR-centered Danais. The monophyly and generic delimitations of the tribe were tested with molecular data. The tribe was strongly supported as monophyletic, and resolved in two well-supported clades: the Danais and Payera-Schismatoclada clade. The ancestor of Danaideae was inferred to have dispersed from continental Africa to Madagascar, where the major diversification of the tribe took place in the Late Miocene to Pliocene. Danais colonized the neighbouring archipelagos between 6.54 and 2.98 Mya, and recolonized continental Africa once.

The predominantly Paleotropical sister tribes Hymenodictyeae and Naucleeae belong to the mainly Neotropical subfamily Cinchonoideae. The monophyly of the Hymenodictyeae genera, Hymenodictyon and Paracorynanthe, received strong support. Naucleeae consists of 26 genera divided in seven subtribes. All subtribes were resolved as monophyletic, while seven genera are paraphyletic; as a result, we recognize 17 genera. Both our results and the fossil record support the hypothesis of a boreotropical distribution for the ancestor of the Hymenodictyeae-Naucleeae clade. All dispersal events in the WIOR took place in the Miocene or later. The Malagasy species were the result of separate dispersal events from Africa and Gyrostipula comorensis endemic to the Comoros is the result of a single dispersal event from Madagascar.

Place, publisher, year, edition, pages
Stockholm: Department of Ecology, Environment and Plant Sciences, Stockholm University, 2014. 41 p.
National Category
Botany
Research subject
Plant Systematics
Identifiers
urn:nbn:se:su:diva-98516 (URN)978-91-7447-832-7 (ISBN)
Public defence
2014-02-14, Lecture Hall, Department of Ecology, Environment and Plant Sciences, Lilla Frescativägen 5, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense the following papers were unpublished and had a status as follows: Paper 2: Manuscript; Paper 3: Manuscript; Paper 4: Manuscript

Available from: 2014-01-23 Created: 2014-01-07 Last updated: 2014-01-24Bibliographically approved

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