@article{fdi:010095960,
  title = {{C}ryptic diversity and genetic differentiation of mesophotic hydroids in the {S}outhwestern {I}ndian {O}cean},
  author = {{O}ry, {D}. and {G}ravier-{B}onnet, {N}. and {C}habanet, {P}ascale and {B}ourmaud, {C}. {A}. {F}. and {B}oissin, {E}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he western {I}ndian {O}cean ({WIO}) is recognized as a marine biodiversity hotspot with complex oceanographic circulation resulting in limited connectivity between remote islands. {T}his ocean region comprises several subregions of varying biodiversity, with the northern {M}ozambique {C}hannel standing out as the core of this hotspot. {A}lthough the hydroids in this region are known to include cryptic species and show contrasting connectivity patterns, the mesophotic depths remain largely unexplored. {T}he {D}eep {R}eef {R}efuge {H}ypothesis suggests that mesophotic coral ecosystems may act as refuges. {H}owever, this hypothesis is based on several prerequisites that could be affected by the presence of cryptic species. {W}e investigated the genetic diversity and connectivity of seven hydroid species by collecting samples at euphotic and mesophotic depths around the islands of {M}ayotte and {R}eunion. {P}opulation genetic patterns were investigated using multivariate analyses and {B}ayesian clustering, with 8-18 microsatellite markers per species. {T}he results revealed greater genetic diversity in {M}ayotte than in {R}eunion, even though fewer samples were collected there. {T}his is in line with the location of the heart of the hotspot in the northern part of the {WIO}. {I}n addition, all species exhibited strong genetic differentiation between samples from the two islands, supporting the "one island, one species" hypothesis previously proposed for hydroids in the region. {H}owever, contrasting values were obtained among depths depending on the species and the island, demonstrating the importance of a multi-species approach. {T}he inclusion of mesophotic samples from the {T}axella eximia/gracilicaulis and {M}acrorhynchia phoenicea species complexes provides new insights into the true biodiversity of these genera, revealing additional cryptic species and putative hybridization. {F}urthermore, the genetic connectivity estimation performed here among depths highlights several species that could be evaluated in terms of the vertical connectivity prerequisite of the {D}eep {R}eef {R}efuge {H}ypothesis in {M}ayotte and {R}eunion.},
  keywords = {connectivity ; {M}ayotte ; microsatellite ; {R}eunion ; species complex ; twilight zone ; {REUNION} ; {MAYOTTE} ; {MOOREA} ; {OCEAN} {INDIEN}},
  booktitle = {},
  journal = {{E}cology and {E}volution},
  volume = {15},
  numero = {12},
  pages = {e72665 [18 p.]},
  ISSN = {2045-7758},
  year = {2025},
  DOI = {10.1002/ece3.72665},
  URL = {https://www.documentation.ird.fr/hor/fdi:010095960},
}