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The founding of Mauritian endemic coffee trees by a synchronous long‐distance dispersal event
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| Zeitschriftentitel: | Journal of Evolutionary Biology |
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| Personen und Körperschaften: | , , |
| In: | Journal of Evolutionary Biology, 27, 2014, 6, S. 1229-1239 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Oxford University Press (OUP)
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| Schlagwörter: |
| Zusammenfassung: | <jats:title>Abstract</jats:title><jats:p>The stochastic process of long‐distance dispersal is the exclusive means by which plants colonize oceanic islands. Baker's rule posits that self‐incompatible plant lineages are unlikely to successfully colonize oceanic islands because they must achieve a coordinated long‐distance dispersal of sufficiently numerous individuals to establish an outcrossing founder population. Here, we show for the first time that Mauritian <jats:italic><jats:styled-content style="fixed-case">C</jats:styled-content>offea</jats:italic> species are self‐incompatible and thus represent an exception to <jats:styled-content style="fixed-case">B</jats:styled-content>aker's rule. The genus <jats:italic><jats:styled-content style="fixed-case">C</jats:styled-content>offea</jats:italic> (<jats:styled-content style="fixed-case">R</jats:styled-content>ubiaceae) is composed of approximately 124 species with a paleotropical distribution. Phylogenetic evidence strongly supports a single colonization of the oceanic island of <jats:styled-content style="fixed-case">M</jats:styled-content>auritius from either <jats:styled-content style="fixed-case">M</jats:styled-content>adagascar or <jats:styled-content style="fixed-case">A</jats:styled-content>frica. We employ <jats:styled-content style="fixed-case">B</jats:styled-content>ayesian divergence time analyses to show that the colonization of <jats:styled-content style="fixed-case">M</jats:styled-content>auritius was not a recent event. We genotype <jats:styled-content style="fixed-case">S</jats:styled-content>‐<jats:styled-content style="fixed-case">RN</jats:styled-content>ase alleles from <jats:styled-content style="fixed-case">M</jats:styled-content>auritian endemic <jats:italic><jats:styled-content style="fixed-case">C</jats:styled-content>offea</jats:italic>, and using <jats:styled-content style="fixed-case">S</jats:styled-content>‐allele gene genealogies, we show that the <jats:styled-content style="fixed-case">M</jats:styled-content>auritian allelic diversity is confined to just seven deeply divergent <jats:italic><jats:styled-content style="fixed-case">C</jats:styled-content>offea </jats:italic><jats:styled-content style="fixed-case">S</jats:styled-content>‐<jats:styled-content style="fixed-case">RN</jats:styled-content>ase allelic lineages. Based on these data, we developed an individual‐based model and performed a simulation study to estimate the most likely number of founding individuals involved in the colonization of <jats:styled-content style="fixed-case">M</jats:styled-content>auritius. Our simulations show that to explain the observed <jats:styled-content style="fixed-case">S</jats:styled-content>‐<jats:styled-content style="fixed-case">RN</jats:styled-content>ase allelic diversity, the founding population was likely composed of fewer than 31 seeds that were likely synchronously dispersed from an ancestral mainland species.</jats:p> |
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| Umfang: | 1229-1239 |
| ISSN: |
1010-061X
1420-9101 |
| DOI: | 10.1111/jeb.12396 |