@article{fdi:010076300,
  title = {{M}etapopulation vicariance, age of island taxa and dispersal : a case study using the {P}acific plant genus {P}lanchonella ({S}apotaceae)},
  author = {{S}wenson, {U}. and {H}avran, {C}. and {M}unzinger, {J}{\'e}r{\^o}me and {M}c{L}oughlin, {S}. and {N}ylinder, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{O}ceanic islands originate from volcanism or tectonic activity without connections to continental landmasses, are colonized by organisms, and eventually vanish due to erosion and subsidence. {C}olonization of oceanic islands occurs through long-distance dispersals ({LDD}s) or metapopulation vicariance, the latter resulting in lineages being older than the islands they inhabit. {I}f metapopulation vicariance is valid, island ages cannot be reliably used to provide maximum age constraints for molecular dating. {W}e explore the relationships between the ages of members of a widespread plant genus ({P}lanchonella, {S}apotaceae) and their host islands across the {P}acific to test various assumptions of dispersal and metapopulation vicariance. {W}e sampled three nuclear {DNA} markers from 156 accessions representing some 100 {S}apotaceae taxa, and analyzed these in {BEAST} with a relaxed clock to estimate divergence times and with a phylogeographic diffusion model to estimate range expansions over time. {T}he phylogeny was calibrated with a secondary point (the root) and fossils from {N}ew {Z}ealand. {T}he dated phylogeny reveals that the ages of {P}lanchonella species are, in most cases, consistent with the ages of the islands they inhabit. {P}lanchonella is inferred to have originated in the {S}ahul {S}helf region, to which it back-dispersed multiple times. {F}iji has been an important source for range expansion in the {P}acific for the past 23 myr. {O}ur analyses reject metapopulation vicariance in all cases tested, including between oceanic islands, evolution of an endemic {F}iji–{V}anuatu flora, and westward rollback vicariance between {V}anuatu and the {L}oyalty {I}slands. {R}epeated dispersal is the only mechanism able to explain the empirical data. {T}he longest (8900 km) identified dispersal is between {P}alau in the {P}acific and the {S}eychelles in the {I}ndian {O}cean, estimated at 2.2 {M}a (0.4–4.8 {M}a). {T}he first split in a {H}awaiian lineage ({P}. sandwicensis) matches the age of {N}ecker {I}sland (11.0 {M}a), when its ancestor diverged into two species that are distinguished by purple and yellow fruits. {S}ubsequent establishment across the {H}awaiian archipelago supports, in part, progression rule colonization. {I}n summary, we found no explanatory power in metapopulation vicariance and conclude that {P}lanchonella has expanded its range across the {P}acific by {LDD}. {W}e contend that this will be seen in many other groups when analyzed in detail.},
  keywords = {{PACIFIQUE} {ILES} ; {VANUATU} ; {HAWAII} ; {SALOMON} ; {FIDJI} ; {TONGA}},
  booktitle = {},
  journal = {{S}ystematic {B}iology},
  volume = {68},
  numero = {6},
  pages = {1020--1033},
  ISSN = {1063-5157},
  year = {2019},
  DOI = {10.1093/sysbio/syz025},
  URL = {https://www.documentation.ird.fr/hor/fdi:010076300},
}