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Publication Type J
Authors Caperta, A. D., S. Castro, J. Loureiro, A. S. Rois, S. Conceicao, J. Costa, L. Rhazi, D. E. Santo and P. Arsenio
Title Biogeographical, ecological and ploidy variation in related asexual and sexual Limonium taxa (Plumbaginaceae)
Source Botanical Journal of the Linnean Society
Author Keywords agamospecies apomixis biogeography chromosome base numbers cytotypes ecological characteristics geographical distribution habitat polyploidy geographical parthenogenesis species plumbaginaceae taxonomic complexity flowering plants apomictic plants british-isles bakers law apomixis evolution populations
Abstract Limonium is a widespread genus of halophytes and taxa found on the Atlantic coast include sexual diploids of the L. ovalifolium complex, agamospermous tetraploids of the L. binervosum complex and the triploid L. algarvense. In this study, we investigated: (1) cytotype distribution and diversity within and among populations in an overlapping region of diploid and polyploid Limonium spp. in south-western Iberia and north-western Morocco; and (2) patterns of geographical parthenogenesis and ecological preferences across a latitudinal gradient on the Atlantic coast. We show here for the first time that L. nydeggeri and L. algarvense are found further south in Morocco than previously reported. Genome size and ploidy estimates showed that the distribution of these species is not random at the overlapping region studied: tetraploid apomicts tend to be found at higher latitudes than the sexual diploids and L. algarvense grows in sympatry at the southern boundaries of the diploids. Natural populations showed a constancy in ploidy in these complexes. However, we report for the first time the occurrence of mixed-ploidy populations of L. ovalifolium s.l., euploid triploids in L. algarvense and aneuploids in the L. binervosum complex. On the Atlantic coasts, L. algarvense followed by L. ovalifolium complexes occur significantly more frequently in thermomediterranean and dry ombrotype habitats than the L. binervosum complex. Significant differences were also observed among taxa in the frequency of occurrences on the most common lithological groups. In conclusion, this work presents the first biogeographical insights for the group based in a coarse-scale analysis of data and it provides evidence of ecological differentiation between the studied Limonium complexes. (C) 2016 The Linnean Society of London, Botanical Journal of the Linnean Society, 2016
ISSN 0024-4074
ISBN 0024-4074
29-Character Source Abbreviation Bot. J. Linnean Soc.
Publication Date Jan
Year Published 2017
Volume 183
Issue 1
Beginning Page 75-93
Unique Article Identifier WOS:000399649300006

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