DOI: 10.1016/j.ympev.2020.106752
论文题名: Phylogeny and biogeography of the Daniellia clade (Leguminosae: Detarioideae), a tropical tree lineage largely threatened in Africa and Madagascar
作者: Choo L.M. ; Forest F. ; Wieringa J.J. ; Bruneau A. ; de la Estrella M.
刊名: Molecular Phylogenetics and Evolution
ISSN: 10557903
出版年: 2020
卷: 146 语种: 英语
英文关键词: Ancestral range estimation
; Conservation assessments
; Forest-savannah transitions
; Guineo-Congolian rainforest
; Molecular phylogenetics
英文摘要: The legume subfamily Detarioideae is exceptionally diverse in tropical Africa and Madagascar, compared to South America or Asia, a trend contrary to that shown by most other pantropical plant groups. We aim to elucidate the process of diversification giving rise to these high diversity levels by focussing our investigations on the Daniellia clade, which is present in both Africa and Madagascar. The Daniellia clade is an early-diverging lineage of subfamily Detarioideae (Leguminosae; pea family) and consists of three genera: Daniellia, Brandzeia and Neoapaloxylon. The species belonging to this group exhibit a wide range of habitat types. The Madagascar endemics Brandzeia (1 species) and Neoapaloxylon (3 species) occupy dry woodlands and arid succulent habitats respectively. Daniellia alsteeniana and D. oliveri are found in savannahs while the remaining eight species within Daniellia all occupy rainforest habitats. Phylogenetic analyses were generated from a dense, multi-individual species level sampling of the clade. Divergence time estimates were carried out using a molecular clock method to investigate biogeographical patterns and shifts in habitat types within the Daniellia clade, and conservation assessments were conducted to determine the levels of extinction risks these species are facing. We estimate that the Daniellia clade first emerged during the Early Eocene from an ancestor present in the rainforests of North Africa at that time, reflecting an ancestral habitat preference. There was a first major split over the course of the Eocene, giving rise to both African rainforest and Madagascan savannah lineages. With the emergence of a drier climate and vegetation type in Africa during the Eocene, it is likely that a dry-climate adapted lineage from the Daniellia clade ancestor could have dispersed through suitable savannah or woodland regions to reach Madagascar, subsequently giving rise to the savannah-adapted ancestor of Brandzeia and Neoapaloxylon in the Early Miocene. The African rainforest lineage gave rise to the genus Daniellia, which is postulated to have first diversified in the Middle Miocene, while savannah species of Daniellia emerged independently during the Pliocene, coinciding with the global rise of C4-dominated grasslands. More than half of the species in the Daniellia clade are near threatened or threatened, which highlights the need to understand the threats of anthropogenic pressures and climate change these species are facing to prioritise their conservation. © 2020 Elsevier Inc. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158346
Appears in Collections: 气候变化与战略
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作者单位: Herbarium, Research & Conservation Branch, Singapore Botanic Gardens, National Parks Board, 1 Cluny Road259569, Singapore; Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3DS, United Kingdom; Naturalis Biodiversity Centre, National Herbarium of the Netherlands, Darwinweg 2, CR Leiden, 2333, Netherlands; Institut de recherche en biologie végétale and Département de Sciences biologiques, Université de Montréal, 4101 Sherbrooke est, Montréal, QC H1X 2B2, Canada; Departamento de Botánica, Ecología y Fisiología Vegetal, Universidad de Córdoba, Campus de Rabanales, Córdoba, 14071, Spain
Recommended Citation:
Choo L.M.,Forest F.,Wieringa J.J.,et al. Phylogeny and biogeography of the Daniellia clade (Leguminosae: Detarioideae), a tropical tree lineage largely threatened in Africa and Madagascar[J]. Molecular Phylogenetics and Evolution,2020-01-01,146