@article{fdi:010084305, title = {{T}en new species of {U}lva ({U}lvophyceae, {C}hlorophyta) discovered in {N}ew {C}aledonia : genetic and morphological diversity, and bloom potential}, author = {{L}agourgue, {L}. and {G}obin, {S}. and {B}risset, {M}. and {V}andenberghe, {S}. and {B}onneville, {C}. and {J}auffrais, {T}. and {V}an {W}ynsberge, {S}. and {P}ayri, {C}laude}, editor = {}, language = {{ENG}}, abstract = {{U}lva is a green macroalgal genus with rich species diversity and worldwide distribution. {W}hile current knowledge on {U}lva diversity focuses on temperate regions, genetic and morphological data in tropical and subtropical areas are scarce and the species richness is not clearly defined. {T}he genus is known for its bloom-forming ability that can induce green tides leading to severe environmental and economic damage. {I}n the last two decades, several important blooms of {U}lva spp. have occurred in {N}ew {C}aledonia, requiring further investigations to identify the species involved. {A}s knowledge of {N}ew {C}aledonian {U}lva diversity is limited, an update to the {U}lva spp. inventory in the area is essential. {B}ased on {U}lva specimens collected throughout {N}ew {C}aledonia ({G}rande {T}erre, {I}sle of {P}ines and {L}oyalty {I}slands), we (1) reassessed species diversity using species delimitation methods, (2) analysed morpho-anatomical characters to identify species and/or enrich their diagnosis, and (3) reconstructed a multilocus phylogeny ({ITS}, rbc{L}, tuf{A}) of the genus. {W}e found 21 secondary species hypotheses ({SSH}s) among our dataset, from which five were successfully assigned to {U}. lactuca, {U}. ohnoi, {U}. tepida, {U}. meridionalis and {U}. taeniata. {T}en {SSH}s were defined as new species for which we provided taxonomic description, and six other {SSH}s were singletons that will need to be data-enriched for better interpretation. {O}ur concatenated multilocus matrix included 61 {U}lva species. {O}f these, 15 species were found in {N}ew {C}aledonia and were moderately to strongly supported. {A}mong the {U}lva species found in {N}ew {C}aledonia, seven are known to be bloom-forming which highlights the need for strict regulation and regular monitoring of water quality, particularly in areas exposed to strong nutrient input where these species can form green tides.}, keywords = {{A}natomy ; diversity ; green tides ; marine ; {P}acific ; phylogeny ; rbc{L} ; species delimitation ; tropical ; {U}lvales ; {NOUVELLE} {CALEDONIE} ; {PACIFIQUE} ; {ZONE} {TROPICALE}}, booktitle = {}, journal = {{E}uropean {J}ournal of {P}hycology}, volume = {[{E}arly access]}, numero = {}, pages = {[21 ]}, ISSN = {0967-0262}, year = {2022}, DOI = {10.1080/09670262.2022.2027023}, URL = {https://www.documentation.ird.fr/hor/fdi:010084305}, }