A complex genetic structure of Tetraclinis articulata (Cupressaceae) in the western Mediterranean

Abstract Some tree species have distributions on both sides of the Strait of Gibraltar and the Strait of Sicily. It is a challenge to determine whether such distributions result from the Tertiary or Pleistocene or from more recent dispersal related to human activities. Tetraclinis articulata (Cupres...

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Bibliographic Details
Published in:Botanical journal of the Linnean Society 2021-11, Vol.197 (3), p.420-438
Main Authors: García-Castaño, Juan Luis, Balao, Francisco, Lorenzo, María Teresa, Véla, Errol, Hadjadj-Aoul, Seghir, Mifsud, Stephen, Terrab, Anass
Format: Article
Language:English
Subjects:
Biodiversity
Biodiversity and Ecology
Botanics
Ecology, environment
Ecosystems
Environmental Sciences
Life Sciences
Systematics, Phylogenetics and taxonomy
Vegetal Biology
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Summary:Abstract Some tree species have distributions on both sides of the Strait of Gibraltar and the Strait of Sicily. It is a challenge to determine whether such distributions result from the Tertiary or Pleistocene or from more recent dispersal related to human activities. Tetraclinis articulata (Cupressaceae) is a gymnosperm that offers an ideal model to deal with this problem because it has a limited area of distribution and has been used only moderately by humans. Three hundred and twenty-three individuals from 30 populations covering the entire distribution of the species were analysed. A multiple approach was developed: (1) by assessing the genetic structure through two molecular techniques, AFLP and nSSR markers, which were used to evaluate the genetic diversity of these populations and the relationships among them and (2) by estimating past distributions. Four lineages of populations that are geographically intermixed to a certain extent are documented here. Results obtained are discussed in the context of palaeontological records and climatic models. There is evidence of an ancient widespread distribution, including Europe, and the subsequent appearance of four isolated lineages that, nowadays, are partially intermixed. Nevertheless, the origin of the current populations could not be fully ascertained through this work, although logical deductions are discussed that consider human activities or, much less probably, wind dispersal of seeds out of refugia in northern Africa-southern Europe during the Quaternary, including shore connections.
ISSN:0024-4074
1095-8339
DOI:10.1093/botlinnean/boab030