Centaurea subsect. Phalolepis (Compositae, Cardueae): a case study of mountain-driven allopatric speciation in the...



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Title: Centaurea subsect. Phalolepis (Compositae, Cardueae): a case study of mountain-driven allopatric speciation in the Mediterranean peninsulas
Authors: García-Jacas, Núria
López-Pujol, Jordi
Nualart, Neus
Susanna de la Serna, Alfonso
Consorci del Museu de Ciències Naturals de Barcelona
Issue Date: 20-Dec-2022
Keywords: Centàurees
Flora alpina
Spatial coverage: Mediterrània (Regió)
Access to document: http://hdl.handle.net/2072/537492
Extent: 15 p.
Abstract: Centaurea subsection Phalolepis has been thoroughly analyzed in previous studies using microsatellites in four centers of speciation: Anatolia, Greece, the Italian Peninsula and the Iberian Peninsula. Evidence suggests a correlation between taxon diversity and mountains. This group constituted a good case study for examining the mountain–geobiodiversity hypothesis (MGH), which explains the possible reasons for the many radiations occurring in mountains across the world. We combined all the datasets and carried out analyses of their genetic structure to confirm the species of subsect. Phalolepis are grouped according to a geographic pattern. We then checked whether climatic fluctuations favored the “species pump” hypothesis in the mountains by using the Climatic Stability Index (CSI). Finally, the relief of the terrain was tested against the rate of allopatric speciation by region by means of Terrain Ruggedness Index and environmental gradients through our new Climate Niche Breadth Index. Our results supported the MGH hypothesis and confirmed that the main triggers, namely altitudinal zonation, climatic oscillations and rugged terrain, must be present for the development of a radiation.
Appears in Collections:Institut Botànic de Barcelona / Articles

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