| Autor: |
Franco, Fernando Faria, Amaral, Danilo Trabuco, Bonatelli, Isabel A. S., Meek, Jared B., Moraes, Evandro Marsola, Zappi, Daniela Cristina, Taylor, Nigel Paul, Eaton, Deren A. R. |
| Zdroj: |
Heredity; June 2024, Vol. 132 Issue: 6 p296-308, 13p |
| Abstrakt: |
Here we use population genomic data (ddRAD-Seq) and ecological niche modeling to test biogeographic hypotheses for the divergence of the island-endemic cactus species Cereus insularisHemsl. (Cereeae; Cactaceae) from its sister species C. fernambucensisLem. The Cereus insularisgrows in the Fernando de Noronha Islands (FNI), a Neotropical archipelago located 350 km off the Brazilian Atlantic Forest (BAF) coast. Phylogeographic reconstructions support a northward expansion by the common ancestor of C. insularisand C. fernambucensisalong the mainland BAF coast, with C. insularisdiverging from the widespread mainland taxon C. fernambucensisafter colonizing FNI in the late Pleistocene. The morphologically distinct C. insularisis monophyletic and nested within C. fernambucensis, as expected from a progenitor-derivative speciation model. We tested alternative biogeographic and demographic hypotheses for the colonization of the FNI using Approximate Bayesian Computation. We found the greatest support for a stepping-stone path that emerged during periods of decreased sea level (the “bridge” hypothesis), in congruence with historical ecological niche modeling that shows highly suitable habitats on stepping-stone islands during glacial periods. The outlier analyses reveal signatures of selection in C. insularis, suggesting a putative role of adaptation driving rapid anagenic differentiation of this species in FNI. |
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