@article{fdi:010090046,
  title = {{P}hylogeography of long-spined sea urchin {D}iadema setosum across the {I}ndo-{M}alay {A}rchipelago},
  author = {{V}imono, {I}. {B}. and {B}orsa, {P}hilippe and {H}ocd{\'e}, {R}{\'e}gis and {P}ouyaud, {L}aurent},
  editor = {},
  language = {{ENG}},
  abstract = {{W}idely distributed, broadcast-spawning {D}iadema sea urchins have been used as model invertebrate species for studying the zoogeography of the tropical {I}ndo-{P}acific. {S}o far, the {I}ndo-{M}alay archipelago, a wide and geographically complex maritime region extending from the eastern {I}ndian {O}cean to the western {P}acific {O}cean, has been under-sampled. {T}his study aims to fill this sampling gap and uncover the phylogeographic structure of the long-spined sea-urchin {D}. setosum in the central {I}ndo-{W}est pacific region. {D}. setosum samples (total {N} = 718) were collected in 13 sites throughout the {I}ndo-{M}alay archipelago. {W}e sequenced over 1157 bp of {COI} gene. {T}he {P}hylogeographic structure was derived from pairwise {OST} estimates using multidimensional scaling and hierarchical clustering analysis; biogeographic hypotheses were tested by {AMOVA}; genetic relationships between haplotypes were summarised in the form of a minimum-spanning network; and pairwise mismatch distributions were compared to the expectations from demographic and spatial expansion models. {A}ll samples from the {I}ndo-{W}est {P}acific were of the previously uncovered {D}. setosum-a lineage. {P}hylogeographic structure was evident: the {A}ndaman {S}ea population and the northern {N}ew {G}uinea population were genetically distinct. {S}ubtler but significant haplotype-frequency differences distinguished two populations within the {I}ndonesian seas, distributed in a parapatric-like fashion. {T}he phylogeographic partition observed was insufficiently explained by previous biogeographic hypotheses. {T}he haplotype network showed a series of closely related star-shaped haplogroups with a high proportion of singletons. {N}ucleotide-pairwise mismatch patterns in the two populations from the {I}ndonesian seas were consistent with both demographic and spatial expansion models. {W}hile geographic barriers to gene flow were inferred at the western and eastern extremities of the {I}ndo-{M}alay archipelago, the subtler parapatric pattern observed within the {I}ndonesian seas indicated restriction in gene flow, in a fashion that can hardly be explained by geographic isolation given the dynamic current systems that cross this region. {O}ur results thus raise the hypothesis of subtle reproductive isolation between ecologically incompatible populations. {W}hile the coalescence pattern of the {A}ndaman-{S}ea population suggested demographic stability over evolutionary timescales, that of the two populations from the {I}ndonesian seas indicated recent population expansion, possibly linked to the rapid changes in available {D}. setosum habitat caused by sea-level oscillations in the late {P}leistocene. {T}he phylogeographic patterns observed in this study point to likely allopatric differentiation in the central {I}ndo-{W}est {P}acific region. {G}enetic differences between populations were likely reinforced during interglacials by some form of reproductive isolation.},
  keywords = {{C}ytochrome oxidase subunit {I} ({COI}) ; {G}eographic barrier ; {R}eproductive isolation ; {D}emographic history ; {I}ndo-{W}est {P}acific ; {INDONESIE} ; {MALAISIE} ; {OCEAN} {INDIEN} ; {PACIFIQUE}},
  booktitle = {},
  journal = {{Z}oological {S}tudies},
  volume = {62},
  numero = {},
  pages = {39 [13 ]},
  ISSN = {1021-5506},
  year = {2023},
  DOI = {10.6620/zs.2023.62-39},
  URL = {https://www.documentation.ird.fr/hor/fdi:010090046},
}