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AOBPreview originally published online on October 2, 2007
Annals of Botany 2007 100(6):1307-1314; doi:10.1093/aob/mcm213
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© The Author 2007. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Cryptic Speciation in the Caesalpinia hintonii Complex (Leguminosae: Caesalpinioideae) in a Seasonally Dry Mexican Forest

Solange Sotuyo1,*, Alfonso Delgado-Salinas2, Mark W. Chase3, Gwilym P. Lewis4 and Ken Oyama1

1 Centro de Investigaciones en Ecosistemas, Universidad Nacional Autónoma de México, México
2 Departamento de Botánica, Instituto de Biología, Universidad Nacional Autónoma de México, México 04510, México, D.F.
3 Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3SD, UK
4 The Herbarium, Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3AB, UK

* For correspondence. E-mail jsotuyo{at}oikos.unam.mx

Received: 9 December 2006    Returned for revision: 20 February 2007    Accepted: 20 July 2007    Published electronically: 2 October 2007

Backgroud and Aims: The Caesalpinia hintonii group comprises six species of endemic shrubs or trees, C. epifanioi, C. hintonii, C. laxa, C. macvaughii, C. melanadenia and C. oyamae, found in scattered patches of seasonally dry forest in the Río Balsas depression and the neighbouring Tehuacán–Cuicatlán valley, which are part of the Mexican morphotectonic province of Sierra Madre del Sur. An evaluation is made of phylogeographic patterns and genetic diversity with a phylogenetic analysis of the C. hintonii complex in order to study the dynamics of speciation in this endemic group of legumes.

Methods: A phylogeographic study based on four highly variable non-coding plastid regions (trnL intron, trnL-F intergenic spacer, trnH-psbA intergenic spacer, and accD-psaI intergenic spacer) was carried out for the Caesalpinia hintonii complex. Five of the six taxa of the C. hintonii complex were included.

Key Results and Conclusions: The plastid analyses involving multiple accessions of each taxon from throughout their ranges resolved C. epifanioi and C. hintonii as well-supported clusters, but C. oyamae has two unexpectedly divergent lineages. Two well-supported geographic clades: eastern (C. epifanioi, C. melanadenia and C. oyamae) and western (C. hintonii and C. macvaughii) were established. The analyses performed provide evidence of recent morphostatic radiation in C. oyamae resulting from isolation and local adaptation. This pattern of genetic differentiation without morphological divergence may be a model that fits many groups of tropical woody taxa inhabiting similarly dry forests subjected to shifting selection.

Key words: Caesalpinia hintonii complex, legumes, Mesoamerica, Mexico, plant phylogeography, population differentiation, seasonally dry forest


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