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Publication Type J
Authors Slenzka, A., L. Mucina and G. Kadereit
Title Salicornia L. (Amaranthaceae) in South Africa and Namibia: rapid spread and ecological diversification of cryptic species
Source Botanical Journal of the Linnean Society
Author Keywords estuary ETS growth form halophyte molecular phylogenetic analysis morphometric analysis Salicornia meyeriana subsp knysnaensis salt marsh salt pans dolichostachya moss aquatic organisms chenopodiaceae dispersal l. biogeography phylogeny model bird dna
Abstract In Salicornia, morphology does not provide reliable diagnostic characters supporting the true extent of evolutionary divergence in the genus, and species concepts have been challenged by molecular analyses. Here, we report the results of an analysis of 91 accessions of the S.meyeriana complex from South Africa and Namibia using the measurements of 38 morphological traits and external transcribed spacer (ETS) sequence data. Morphological data were analysed using discriminant analysis, principal coordinate analysis and nonmetric multidimensional scaling. Phylogenetic divergence was compared with the geographical and ecological diversity of the sampled populations. Tree topology corresponds to geography and ecology, but not to morphology. Most clades have distinct distribution areas and ecological profiles related to tidal, supratidal or inland saline habitats. Salicornia probably diversified in habitats that have experienced regular fragmentation by marine transgression/regression cycles during the Pleistocene. We suggest that this radiation produced young, but genetically, geographically and ecologically well-defined lineages. The lack of morphological signal reveals the existence of cryptic species in Salicornia and demonstrates the necessity of using molecular data to define taxa in this genus. We propose the recognition of two subspecies in the S.meyeriana complex: S.meyeriana subsp. meyeriana and S.meyeriana subsp. knysnaensis.(c) 2013 The Linnean Society of London, Botanical Journal of the Linnean Society, 2013, 172, 175186.
Author Address Univ Med Mainz, Inst Pharmakol, D-55101 Mainz, Germany. Curtin Univ Technol, Curtin Inst Biodivers & Climate, Dept Environm & Agr, Perth, WA 6845, Australia. Johannes Gutenberg Univ Mainz, Inst Allgemeine & Spezielle Bot, D-55099 Mainz, Germany. Johannes Gutenberg Univ Mainz, Bot Garten, D-55099 Mainz, Germany. Kadereit, G (reprint author), Johannes Gutenberg Univ Mainz, Inst Allgemeine & Spezielle Bot, Bentzelweg 9A, D-55099 Mainz, Germany. clausing@uni-mainz.de
ISSN 0024-4074
ISBN 0024-4074
29-Character Source Abbreviation Bot. J. Linnean Soc.
Publication Date Jun
Year Published 2013
Volume 172
Issue 2
Beginning Page 175-186
Digital Object Identifier (DOI) 10.1111/boj.12041
Unique Article Identifier WOS:000319152700004
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