Ecological differentiation and cladogenesis of Baldellia (L.) Parl. (Alismataceae外文翻译.pdf

Plant Syst Evol (2011) 291:173–182 DOI 10.1007/s00606-010-0376-0 ORIGINAL ARTICLE Ecological differentiation and cladogenesis of Baldellia (L.) Parl. (Alismataceae) Emanuela Agostinelli • Jose Antonio Molina • Cristina Pardo • Donata Cafasso Received: 12 March 2010 / Accepted: 4 October 2010 / Published online: 21 November 2010 Springer-Verlag 2010 Abstract The Iberian Peninsula is home to a large scenario well supported by marked differences in species’ number of endemic species that often show strong genetic ecological preferences and climate analysis. subdivisions which indicate possible isolation of popula- tions in the past. Numerous phylogeographic and phylo- Keywords Phylogeography Plastid DNA Glaciation genetic studies on Iberian flora and fauna have revealed Bioclimatic indexes Water plant this territory to be the origin of genetic differentiation during the Pleistocene Ice Age. To better understand the influence of Plio-Pleistocene climatic oscillations on the Introduction cladogenesis and population structuring of refugial taxa restricted to freshwaters of the Iberian Peninsula, we The most recent palaeoclimatic events that resulted in studied the evolutionary history of the small European multiple glacial–interglacial cycles have frequently been genus Baldellia, both from a phylogenetic/phylogeographic described as ‘‘a time of crisis and restructuring’’ (Brett perspective and regarding its ecological characteristics. et al. 1996) for plant evolutionary histories in the Medi- Molecular analyses were based on four plastid regions and terranean Basin (Willis and Niklas 2004). The formation of nuclear ITS2 ribosomal spacer from individuals belo