@article{fdi:010092676, title = {{S}uccessive cycles of allopatric differentiation and secondary contact shape phylogeographical structure in an {I}ndo-{W}est {P}acific reef fish}, author = {{H}su, {L}. {L}. and {B}orsa, {P}hilippe and {C}hen, {W}. {J}.}, editor = {}, language = {{ENG}}, abstract = {{G}eographical barriers and sea-level fluctuations have significantly influenced the population genetic structure and evolutionary history of {I}ndo-{W}est {P}acific ({IWP}) reef species. {T}his study examines these effects in {A}budefduf septemfasciatus (banded sergeant), a widely distributed egg-brooding {IWP} damselfish. {U}sing 4700 genome-wide single nucleotide polymorphisms obtained from double-digest restriction site-associated {DNA} sequencing and a 1638-bp mitochondrial gene fragment from 106 samples across six {IWP} locations, we identified two main genetic clusters: one in the {I}ndian {O}cean and another in the {P}acific {O}cean. {W}ithin the {P}acific, two distinct subclusters were detected, with overlapping ranges in {T}aiwan. {D}emographic analysis of the dataset using two-population genetic models in partial derivative a partial derivative {I}, based on diffusion approximation, revealed asymmetric gene flow, with stronger migration from the {I}ndian {O}cean to the {P}acific. {R}ecurrent episodes of isolation and secondary contact during {P}leistocene glacial cycles further shaped these genetic patterns. {O}ur findings provide new insights into the complex phylogeography and evolutionary dynamics of banded sergeants, contributing to a broader understanding of how historical environmental changes have driven the diversification of {IWP} reef fishes.}, keywords = {{A}budefduf ; biogeography ; climate change ; dd{RAD}seq ; marine biodiversity ; {P}leistocene glacial cycles ; population genetic structure ; population genomics ; sergeant-majors ; {OCEAN} {INDIEN} ; {PACIFIQUE}}, booktitle = {}, journal = {{B}iological {J}ournal of the {L}innean {S}ociety}, volume = {144}, numero = {2}, pages = {blaf002 [16 p.]}, ISSN = {0024-4066}, year = {2025}, DOI = {10.1093/biolinnean/blaf002}, URL = {https://www.documentation.ird.fr/hor/fdi:010092676}, }