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Evolutionary Ecology

, Volume 28, Issue 4, pp 751–774 | Cite as

Historical and ecological divergence among populations of Monttea chilensis (Plantaginaceae), an endemic endangered shrub bordering the Atacama Desert, Chile

  • Matías C. Baranzelli
  • Leigh A. Johnson
  • Andrea Cosacov
  • Alicia N. Sérsic
Original Paper

Abstract

The coastal deserts of northern Chile show an important latitudinal gradient of aridity with more arid areas to the north of the Atacama Desert than to the south. Several plant species have disjunct distributions that correspond with the extremes of this latitudinal gradient. In this study, using genetic (chloroplast and nuclear DNA), morphological (vegetative and floral traits of various kinds) and climatic and topographic information, we explored ecological and historical events that have putatively shaped patterns of variation among Monttea chilensis populations—a species that shows this disjunct distribution. Through phylogeographic and phylogenetic analyses, two divergent lineages were identified located at the latitudinal extremes. The lineage located northern lineage (NG) of the Atacama Desert showed more genetic diversity and better-resolved phylogeographic structure than the southern lineage (SG). Considerable morphological variation across the geographical range corresponds with these genetic groups. We observed contrasting relationships between floral and vegetative traits: populations from the most arid region NG possessed larger flowers, but smaller vegetative values, and vice versa. Niche modelling and multivariate analyses, including environmental data, revealed different environmental requirements for each lineage. NG plants occur in regions with warmer and drier climatic conditions and at higher altitudes, while SG populations inhabit colder and more humid environments and lower altitudes. The evolutionary history of M. chilensis exhibits a phylogeographical footprint consistent with past fragmentation and allopatric differentiation, where the hyper-arid zone formed by the Atacama Desert clearly acted as an important gene flow barrier. This barrier has led to considerable differentiation in morphology and ecology, resulting in two ecotypes or geographical races, suggesting incipient speciation promoted by local adaptation and geographical isolation.

Keywords

Aridization Ecological niche modelling Flower shape Flower colour Geographic variation Plant phylogeography Vicariance 

Notes

Acknowledgments

We thank CONAF for allowing us to carry out studies in protected areas of Chile and Andrea Cocucci for field assistance. A.C. and A.N.S. acknowledge the National Research Council of Argentina (CONICET) as researchers and M.C.B as a doctoral fellowship holder. Financial support was provided by CONICET (Nº1672), SeCyT-FONCyT (PICT-2011-0837), MINCyT-Cba (Nº000113/2011) SeCyT-UNC (Nº162/12) and Myndel Pedersen Foundation (to A.N.S.).

Supplementary material

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Supplementary material 1 (DOC 40 kb)
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Supplementary material 2 (DOC 3243 kb)
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Supplementary material 3 (DOCX 134 kb)
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Supplementary material 4 (DOC 37 kb)

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Matías C. Baranzelli
    • 1
  • Leigh A. Johnson
    • 2
  • Andrea Cosacov
    • 1
  • Alicia N. Sérsic
    • 1
  1. 1.Laboratorio de Ecología Evolutiva – Biología Floral, Instituto Multidisciplinario de Biología Vegetal (IMBIV)CONICET-Universidad Nacional de CórdobaCórdobaArgentina
  2. 2.Department of Biology and M. L. Bean Life Science MuseumBrigham Young UniversityProvoUSA

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