TY - JOUR T1 - Biogeographic events are not correlated with diaspore dispersal modes in Boraginaceae JF - Frontiers in Ecology and Evolution Y1 - 2017 DO - 10.3389/fevo.2017.00026 A1 - Chacón, Juliana A1 - Luebert, Federico A1 - M. Weigend SP - 26 KW - anemochory KW - Atelechory KW - Endozoochory KW - Epizoochory KW - long-distance dispersal KW - nautochory KW - Paleocene-Eocene Thermal Maximum KW - stochastic mapping methods AB -

Long-distance dispersal seems to be the main biogeographic event responsible for intriguing distribution patterns in plant groups in which sister taxa are separated by thousands of kilometers of distance across oceans and continents. The biotic and abiotic mechanisms behind such dispersal events are poorly understood and many attempts have been made to explain how plants can manage to disperse and survive these long journeys. The biogeographic history of Boraginaceae, a subcosmopolitan plant family with many disjunct clades, is here addressed and analyzed in the context of the different dispersal modes exhibited by the species. The lack of a clear pattern between the main dispersal events in Boraginaceae and the phylogenetic distribution of the dispersal modes indicates that no single dispersal mechanism can be associated with the events of dispersal in the family. Moreover, adaptations to different dispersal agents and unassisted dispersal modes in some clades might have promoted the diversification of Boraginaceae in various habitats across several continents. Our study reveals that long-distance dispersal is a very complex process that needs to be analyzed in the context of climatic and environmental changes and the response of plants and their dispersal vectors to these variable conditions.

VL - 5 UR - http://journal.frontiersin.org/article/10.3389/fevo.2017.00026/abstract ER - TY - JOUR T1 - Historical biogeography of Boraginales: West Gondwanan vicariance followed by long-distance dispersal? JF - Journal of Biogeography Y1 - 2017 DO - 10.1111/jbi.12841 A1 - Luebert, Federico A1 - Couvreur, Thomas L. P. A1 - Marc Gottschling A1 - Hilger, Hartmut H. A1 - Miller, James S. A1 - M. Weigend SP - 158–169 KW - Ancestral area reconstruction KW - Boraginaceae KW - historical biogeography KW - Molecular dating KW - vicariance KW - West Gondwana AB -

Aim To examine the historical biogeography of the Boraginales using molecular dating and ancestral area reconstruction. Location World-wide. Methods We constructed data sets that included all major clades of Boraginales and all orders of asterids using previously published sequences of four plastid markers (trnL-trnF, rps16, ndhF, rbcL). We estimated divergence times using a Bayesian uncorrelated, lognormal relaxed clock approach with four different fossil calibration schemes. Ancestral areas were reconstructed using maximum likelihood methods (Dispersal-Extinction-Cladogenesis). Results Boraginales originated during the Early to Late Cretaceous and started its diversification in the Late Cretaceous. The inferred ancestral area of Boraginales includes the Americas and Africa. The two major clades of Boraginales diversified during the Early Paleogene from African and American ancestors respectively. Early branching families in both clades (Codonaceae and Wellstediaceae in one clade and Hydrophyllacee and Namaceae in the other) may have remained restricted to their areas of origin. The other families started diversifying in several regions of the world during the Eocene (Boraginaceae s.str., Heliotropiaceae, Ehretiaceae) or later (Cordiaceae). Main conclusions Molecular dating and ancestral area reconstruction may be broadly consistent with the idea of a vicariant origin of the two major clades of Boraginales after the break-up of West Gondwana, followed by several independent trans-oceanic dispersal events into most areas of the world. However, uncertainty in both divergence times and ancestral area reconstruction do not rule out the possibility of an origin involving long-distance dispersal.

VL - 44 UR - http://onlinelibrary.wiley.com/doi/10.1111/jbi.12841/abstract ER - TY - JOUR T1 - The borage family (Boraginaceae s.str.): A revised infrafamilial classification based on new phylogenetic evidence, with emphasis on the placement of some enigmatic genera JF - Taxon Y1 - 2016 DO - 10.12705/653.6 A1 - Chacón, Juliana A1 - Luebert, Federico A1 - Hilger, Hartmut H. A1 - Ovchinnikova, Svetlana A1 - Selvi, Federico A1 - Cecchi, Lorenzo A1 - Guilliams, C. Matt A1 - Hasenstab-Lehman, Kristen A1 - Sutorý, Karel A1 - Simpson, Michael G. A1 - M. Weigend SP - 523–546 VL - 65 UR - http://www.ingentaconnect.com/content/iapt/tax/2016/00000065/00000003/art00007 IS - 3 ER -