Systématique, biogéographie et diversification du genre Crudia (Leguminosae, Detarioideae)

說明

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如何引用

研究者應依照以下指示引用此資源。:

Domenech B (2018): Systématique, biogéographie et diversification du genre Crudia (Leguminosae, Detarioideae). v1.0. Université de Montréal Biodiversity Centre. Dataset/Occurrence. https://doi.org/10.5886/dpabji

權利

研究者應尊重以下權利聲明。:

此資料的發布者及權利單位為 Université de Montréal Biodiversity Centre。 This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.

GBIF 註冊

此資源尚未向GBIF註冊

關鍵字

Occurrence; Specimen; Crudia; Detarioideae; taxonomic revision; phylogeny; evolution; biogeography; divergence time; systematic; ecological niche; diversification; tropical biomes

聯絡資訊

地理涵蓋範圍

Sampling worldwide, but focused on tropical areas, ecological niches for genus Crudia.

分類群涵蓋範圍

無相關描述

時間涵蓋範圍

計畫資料

In the subfamily Detarioideae (Leguminosae), the genus Crudia Schreb. shows an unusual pantropical distribution and high species richness compared to closely related genera. Crudia species, spread throughout South America, West Africa and Southeastern Asia, have been the focus of independent taxonomic studies conducted by several consecutive authors. To date, however, the evolution and biogeographic history of this genus remain poorly understood. We propose a multidisciplinary approach to study this poorly known genus and to improve our understanding of its evolutionary history. First, we conducted a taxonomic revision of Asian species within the genus Crudia, in accordance with the recent revisions of African and American species. We used traditional taxonomic methods by compiling morphological data based on the study of herbarium specimens. From an initial description of thirty five species from the literature, we retained fourteen species and synonymized the others except for one we consider as a doubtful species. A newly described species was also added. Species geographic distributions were reevaluated and new conservation statuses were suggested. Second, we established a conceptual framework to study the evolution, biogeographic history, and relationship between species of this genus. We sequenced five nuclear regions (ITS, ETS, AGT1, CALTL, and AIGP) on numerous sampled herbarium specimens (K, US, P, L, WAG, U). The phylogenetic analyses resolve Crudia as monophyletic with a well-identified internal structure composed of one clade grouping all Asian species and one clade grouping both African and American species, with the American species grouped in a single clade. Reconstructions of biogeographic history and an associated divergence time analysis calibrated with macrofossils show Crudia originated in Africa during the Eocene and underwent two independent dispersal events during mid-Eocene: from Africa to South America and from Africa to Southeastern Asia. Third, we tested if species richness in the genus Crudia is associated with changes in diversification rates through time and with ecological niche shifts throughout its global distribution. We used species occurrence data, carefully selected to avoid identification errors, associated with environmental data retrieved from the literature. Diversification rates were studied both at the scale of the genus Crudia and the Detarioideae subfamily. We conclude that ecological niches differ from one continent to another and no diversification rates changes were detected in the genus Crudia. Our finding suggest that the greater species richness in Crudia compared to sister genera may be the consequence of relatively older age of this genus.

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